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SlashBeast
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PostPosted: Thu Dec 27, 2012 8:45 pm    Post subject: IRQ seems to be using only CPU0. Reply with quote

For some unknown to me reason the IRQ seems to use pretty much only CPU0, smp_affinity the '00000f' suppose to use ALL cpus but it does use only the first one, I have googled the http://docs.oracle.com/cd/E24290_01/coh.371/e22838/tune_perftune.htm which let me understand a little about how can I force a specified irq to use specified cpu, I have written a hacky script to balance it between 4 threads (I own core i5-2430M, two cores with ht) and it seems to be working, kind of...

Code:
#!/bin/sh
# irq-rebalance.sh
for i in /proc/irq/*/smp_affinity; do
   case "${smp_affinity}" in
      ''|'8')
         smp_affinity=1
      ;;
      '1')
         smp_affinity=2
      ;;
      '2')
         smp_affinity=4
      ;;
      '4')
         smp_affinity=8
      ;;
   esac

   echo "$i: 00000${smp_affinity}"
   echo "00000${smp_affinity}" >"$i"
done


Without it, the /proc/interrupts looks like:
Code:
           CPU0       CPU1       CPU2       CPU3
  0:         24          0          0          0   IO-APIC-edge      timer
  1:      62188          0          0          0   IO-APIC-edge      i8042
  8:        267          0          0          0   IO-APIC-edge      rtc0
  9:     264195          0          0          0   IO-APIC-fasteoi   acpi
 12:     136278          0          0          0   IO-APIC-edge      i8042
 16:      18718          0          0          0   IO-APIC-fasteoi   i915, ehci_hcd:usb1
 17:    7697397          0          0          0   IO-APIC-fasteoi   ehci_hcd:usb2, iwlwifi
 18:    1083624          0          0          0   IO-APIC-fasteoi   ahci, mmc0, eth0
 22:     860678          0          0          0   IO-APIC-fasteoi   snd_hda_intel
NMI:          0          0          0          0   Non-maskable interrupts
LOC:    3362075    3341920    3416035    3924691   Local timer interrupts
SPU:          0          0          0          0   Spurious interrupts
PMI:          0          0          0          0   Performance monitoring interrupts
IWI:          0          0          0          0   IRQ work interrupts
RTR:          3          0          0          0   APIC ICR read retries
RES:     275352     310805     137941      66781   Rescheduling interrupts
CAL: 4294963368 4294964404 4294964540 4294964464   Function call interrupts
TLB:     261929     332582     224693     200127   TLB shootdowns
TRM:          0          0          0          0   Thermal event interrupts
THR:          0          0          0          0   Threshold APIC interrupts
MCE:          0          0          0          0   Machine check exceptions
MCP:        147        147        147        147   Machine check polls
ERR:          0
MIS:          0


And yes, I have no idea what I am doing, if anyone have any idea about the IRQ and can tell me why its not balanced I would be thankful.
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aCOSwt
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PostPosted: Thu Dec 27, 2012 9:02 pm    Post subject: Reply with quote

Could be not related at all, just curious to know the status of CONFIG_HOTPLUG_CPU on the kernel your system is running.
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SlashBeast
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PostPosted: Thu Dec 27, 2012 9:08 pm    Post subject: Reply with quote

It is enabled, I think I need it for suspend (s2disk) to work.
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Ant P.
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PostPosted: Thu Dec 27, 2012 9:19 pm    Post subject: Reply with quote

There's little point in balancing IRQs on a non-NUMA system, since most of their work is done in kernel threads already.
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SlashBeast
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PostPosted: Thu Dec 27, 2012 9:21 pm    Post subject: Reply with quote

Well, the thing is, when I have really busy usb ports (like copy a lot of data with avg 28 MBps from one usb device to another) my touchpad is... laggy. I also notice other small issues that could be IRQ fault. Appreantly manual rerouting is the only possible solution. Thats just sad.
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PaulBredbury
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PostPosted: Thu Dec 27, 2012 10:30 pm    Post subject: Reply with quote

SlashBeast wrote:
my touchpad is... laggy

From my messing with IRQs, trying to optimize USB mouse input, soundcard and Nvidia IRQs (I just created contention and more latency), I would say just let the scheduler do it. I.e.:

Code:
echo f > /proc/irq/default_smp_affinity

for i in /proc/irq/*/smp_affinity; do
  echo f > $i
done


(Is it supposed to be "f" or "0f" or 15?)

I don't know why this isn't automatic for you. Maybe:
Quote:
So if on your system CPU0 handles all interrupts by default, this probably means that APIC configured ambiguously.
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SlashBeast
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PostPosted: Thu Dec 27, 2012 10:36 pm    Post subject: Reply with quote

PaulBredbury wrote:
I don't know why this isn't automatic for you.


It is, but because of HOTPLUG_CPU (as I googled) it does force them on CPU0, the great read http://www.alexonlinux.com/smp-affinity-and-proper-interrupt-handling-in-linux
Long story short, when you have f (00000f), instead of using all cpus, it uses CPU0.

For now I adjusted the routes manualy, to put sata, wifi and sound card on different cores/threads.
Code:
#!/bin/sh

set_irq() {
   irq="$1"
   case "$2" in
      cpu0)
         cpu=1
      ;;
      cpu1)
         cpu=2
      ;;
      cpu2)
         cpu=4
      ;;
      cpu3)
         cpu=8
      ;;
   esac

   echo "${cpu}" >"/proc/irq/${irq}/smp_affinity"
}

# 17: ehci_hcd:usb2, iwlwifi
set_irq 17 cpu3
# 18: ahci, mmc0, eth0
set_irq 18 cpu2
# 22: snd_hda_intel
set_irq 22 cpu1


And after few hours I can see that it does make things better, at least on paper.

Code:
sabre ~ # ./summarize_irq_stats.awk old_interrupts
cpu0: 14022875
cpu1: 3985454
cpu2: 3778816
cpu3: 4191746
sabre ~ # ./summarize_irq_stats.awk /proc/interrupts
cpu0: 605714
cpu1: 547066
cpu2: 625991
cpu3: 825810

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Ant P.
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PostPosted: Fri Dec 28, 2012 1:30 am    Post subject: Reply with quote

If you want another (slightly crazy) solution you could try booting with "threadirqs=1", which forces all IRQ handlers possible into separate threads. IIRC the realtime kernel project uses this, so it should be safe.
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dmpogo
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PostPosted: Fri Dec 28, 2012 1:38 am    Post subject: Reply with quote

SlashBeast wrote:
PaulBredbury wrote:
I don't know why this isn't automatic for you.


It is, but because of HOTPLUG_CPU (as I googled) it does force them on CPU0, the great read http://www.alexonlinux.com/smp-affinity-and-proper-interrupt-handling-in-linux
Long story short, when you have f (00000f), instead of using all cpus, it uses CPU0.



That cannot be general situation. I have CONFIG_HOTPLUG_CPU=y on all four different machines I manage, and they all show proper IRQ balancing.
Note also that your reference refers to quite old kernels <= 2.6.24
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SlashBeast
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PostPosted: Fri Dec 28, 2012 10:31 am    Post subject: Reply with quote

dmpogo wrote:
That cannot be general situation. I have CONFIG_HOTPLUG_CPU=y on all four different machines I manage, and they all show proper IRQ balancing.
Note also that your reference refers to quite old kernels <= 2.6.24


Then I am absolutly without idea, because it does keep all devices, acpi and rtc on one cpu. What is interesing I just tested on another sandybridge cpu, i7-2600, and I also see that devices' irq occupate single core.

Code:
# cat /proc/interrupts
           CPU0       CPU1       CPU2       CPU3       CPU4       CPU5       CPU6       CPU7       
  0:         25          0          0          0          0          0          0          0   IO-APIC-edge      timer
  1:        249          0          0          0          0          0          0          0   IO-APIC-edge      i8042
  8:          1          0          0          0          0          0          0          0   IO-APIC-edge      rtc0
  9:          0          0          0          0          0          0          0          0   IO-APIC-fasteoi   acpi
 23:         60          0          0          0          0          0          0          0   IO-APIC-fasteoi   ehci_hcd:usb3, ehci_hcd:usb4
 40:          0          0          0          0          0          0          0          0   PCI-MSI-edge      PCIe PME
 41:          0          0          0          0          0          0          0          0   PCI-MSI-edge      PCIe PME
 42:          0          0          0          0          0          0          0          0   PCI-MSI-edge      PCIe PME
 43:          0          0          0          0          0          0          0          0   PCI-MSI-edge      PCIe PME
 44:   98076556          0          0          0          0          0          0          0   PCI-MSI-edge      ahci
 45:   90452375          0          0          0          0          0          0          0   PCI-MSI-edge      eth0
 46:         63          0          0          0          0          0          0          0   PCI-MSI-edge      i915
 47:          0          0          0          0          0          0          0          0   PCI-MSI-edge      xhci_hcd
 48:          0          0          0          0          0          0          0          0   PCI-MSI-edge      xhci_hcd
 49:          0          0          0          0          0          0          0          0   PCI-MSI-edge      xhci_hcd
 50:          0          0          0          0          0          0          0          0   PCI-MSI-edge      xhci_hcd
 51:          0          0          0          0          0          0          0          0   PCI-MSI-edge      xhci_hcd
 52:          0          0          0          0          0          0          0          0   PCI-MSI-edge      xhci_hcd
 53:          0          0          0          0          0          0          0          0   PCI-MSI-edge      xhci_hcd
 54:          0          0          0          0          0          0          0          0   PCI-MSI-edge      xhci_hcd
NMI:     218863     198034     192376     194477      42378      50328      52237      54105   Non-maskable interrupts
LOC: 1401606099 1421191629 1426138094 1432049557  479262595  490584201  490445234  478404349   Local timer interrupts
SPU:          0          0          0          0          0          0          0          0   Spurious interrupts
PMI:     218863     198034     192376     194477      42378      50328      52237      54105   Performance monitoring interrupts
IWI:          0          0          0          0          0          0          0          0   IRQ work interrupts
RTR:          7          0          0          0          0          0          0          0   APIC ICR read retries
RES:   26000157    9166845    2035661    1303693     788125     845999     904785     973690   Rescheduling interrupts
CAL:    7014953    7022613    7070873    7139248     670430     726545     757997     763109   Function call interrupts
TLB:    7950685    7524917    7394655    7322978    5088431    5147306    5228957    5433623   TLB shootdowns
TRM:          0          0          0          0          0          0          0          0   Thermal event interrupts
THR:          0          0          0          0          0          0          0          0   Threshold APIC interrupts
MCE:          0          0          0          0          0          0          0          0   Machine check exceptions
MCP:       8683       8683       8683       8683       8683       8683       8683       8683   Machine check polls
ERR:          0

And thats on 3.4.x kernel with debian's config.

Ant P. wrote:
If you want another (slightly crazy) solution you could try booting with "threadirqs=1", which forces all IRQ handlers possible into separate threads. IIRC the realtime kernel project uses this, so it should be safe.

There is so little info about threadirqs, I wouild like to know about some cons and pros of it.
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PostPosted: Fri Dec 28, 2012 1:24 pm    Post subject: Reply with quote

that's so weird, it should be automagically spreaded out over irqs.

I suspect bad kernel config, only explanation. And why are u using a Debian .config??

There shouldn't be done any manual intervention to spread out interrupts on multiple cores.

Also why don't you put i915, iwlwifi, eth0, snd_hda_intel on MSI irq? Those are doable, prolly ahci and mmc0 as well.
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BillWho
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PostPosted: Fri Dec 28, 2012 7:40 pm    Post subject: Reply with quote

SlashBeast,

I've never checked this until I read through this thread. Interestingly enough on a Intel(R) Core(TM) i3-2350M CPU @ 2.30GHz laptop:
Code:
laptop linux # cat /proc/interrupts
           CPU0       CPU1       CPU2       CPU3       
  0:        122          0          0          0   IO-APIC-edge      timer
  1:       4959          0          0          0   IO-APIC-edge      i8042
  8:          1          0          0          0   IO-APIC-edge      rtc0
  9:          0          0          0          0   IO-APIC-fasteoi   acpi
 12:     214633          0          0          0   IO-APIC-edge      i8042
 16:      38356          0          0          0   IO-APIC-fasteoi   ehci_hcd:usb1
 19:     242556          0          0          0   IO-APIC-fasteoi   ath9k
 23:      82206          0          0          0   IO-APIC-fasteoi   ehci_hcd:usb2
 41:      78453          0          0          0   PCI-MSI-edge      ahci
 42:          0          0          0          0   PCI-MSI-edge      eth0
 43:        552          0          0          0   PCI-MSI-edge      snd_hda_intel
 44:         88          0          0          0   PCI-MSI-edge      i915
NMI:          0          0          0          0   Non-maskable interrupts
LOC:    1073823     938123     908729     929452   Local timer interrupts
SPU:          0          0          0          0   Spurious interrupts
PMI:          0          0          0          0   Performance monitoring interrupts
IWI:          0          0          0          0   IRQ work interrupts
RTR:          2          0          0          0   APIC ICR read retries
RES:     259554      39511      30216      21274   Rescheduling interrupts
CAL:     257645     252898     233423     233077   Function call interrupts
TLB:          0          0          0          0   TLB shootdowns
TRM:          0          0          0          0   Thermal event interrupts
THR:          0          0          0          0   Threshold APIC interrupts
MCE:          0          0          0          0   Machine check exceptions
MCP:         35         35         35         35   Machine check polls
ERR:          0
MIS:          0

On a AMD Phenom(tm) 9150e Quad-Core Processor desktop:
Code:
stable ~ # cat /proc/interrupts
           CPU0       CPU1       CPU2       CPU3       
  0:        118          0          0          0   IO-APIC-edge      timer
  1:          0          0          0          2   IO-APIC-edge      i8042
  7:          1          0          0          0   IO-APIC-edge   
  8:          0          0          0          1   IO-APIC-edge      rtc0
  9:          0          0          0          0   IO-APIC-fasteoi   acpi
 12:          0          0          0          4   IO-APIC-edge      i8042
 16:          0          0          6       1898   IO-APIC-fasteoi   ohci_hcd:usb3, ohci_hcd:usb4, snd_hda_intel
 17:          0          0          0          3   IO-APIC-fasteoi   ehci_hcd:usb1
 18:         12         86       1512    1968847   IO-APIC-fasteoi   ohci_hcd:usb5, ohci_hcd:usb6, ohci_hcd:usb7, radeon
 19:          2          8        390      62737   IO-APIC-fasteoi   ehci_hcd:usb2, snd_hda_intel
 22:          0          3        427      48467   IO-APIC-fasteoi   ahci
 42:          0          2        134      23787   PCI-MSI-edge      eth0
NMI:          0          0          0          0   Non-maskable interrupts
LOC:    1578605    2145196    1964563    2957637   Local timer interrupts
SPU:          0          0          0          0   Spurious interrupts
PMI:          0          0          0          0   Performance monitoring interrupts
IWI:          0          0          0          0   IRQ work interrupts
RTR:          0          0          0          0   APIC ICR read retries
RES:    2728849     898339     755100     712052   Rescheduling interrupts
CAL:      52242      85795      65919      59867   Function call interrupts
TLB:          0          0          0          0   TLB shootdowns
TRM:          0          0          0          0   Thermal event interrupts
THR:          0          0          0          0   Threshold APIC interrupts
MCE:          0          0          0          0   Machine check exceptions
MCP:         27         27         27         27   Machine check polls
ERR:         13
MIS:          0

Both are running version 3.6.11-gentoo kernel with similar config settings except of course for specific hardware differences. I have absolutely no clue :?
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PostPosted: Sat Dec 29, 2012 1:07 pm    Post subject: Reply with quote

all my irqs are evenly spreaded over all the cores and the same number. Let's say the sound card is around 200 accross all the cores. And NOT 2 in one, 400 in another and 502342 in another and 0 in another.

This can't be that hard, double check these sections in menuconfig:

Code:
General setup -->
Processor type and features -->


Boot with systemrescuecd, the latest release and check its behaviour.
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PostPosted: Sun Dec 30, 2012 12:09 am    Post subject: Reply with quote

_______0 wrote:
I suspect bad kernel config, only explanation. And why are u using a Debian .config??

Because its a Debian.

_______0 wrote:
all my irqs are evenly spreaded over all the cores and the same number. Let's say the sound card is around 200 accross all the cores. And NOT 2 in one, 400 in another and 502342 in another and 0 in another.

This can't be that hard, double check these sections in menuconfig:

Code:
General setup -->
Processor type and features -->



Check for?
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PostPosted: Sun Dec 30, 2012 12:46 pm    Post subject: Reply with quote

SlashBeast wrote:

Because its a Debian.


I fail to see how's that's a gentoo problem then.

All the /proc/interrupts pasted here look plain wrong.

This is how ALL devices should appear like:

Code:
 16:        257        257        258 IO-APIC-fasteoi   snd_hda_intel
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PostPosted: Sun Dec 30, 2012 9:06 pm    Post subject: Reply with quote

SlashBeast.

Here's a dual Intel(R) Xeon(R) CPU 5160 @ 3.00GHz
Code:
ws490-gentoo ~ # cat /proc/interrupts
            CPU0       CPU1       CPU2       CPU3       
   0:        163          0          0          0   IO-APIC-edge      timer
   1:          1          1          0          0   IO-APIC-edge      i8042
   8:          5          5          3          2   IO-APIC-edge      rtc0
   9:          0          0          0          0   IO-APIC-fasteoi   acpi
  12:          1          0          1          2   IO-APIC-edge      i8042
  14:        509        520        523        515   IO-APIC-edge      ata_piix
  15:          0          0          0          0   IO-APIC-edge      ata_piix
  16:         78         69         81         76   IO-APIC-fasteoi   nouveau
  18:          0          0          0          0   IO-APIC-fasteoi   uhci_hcd:usb4
  20:       1480       1480       1475       1476   IO-APIC-fasteoi   ahci
  21:       7954       7958       7949       7960   IO-APIC-fasteoi   ehci_hcd:usb1, uhci_hcd:usb2
  22:          0          0          0          0   IO-APIC-fasteoi   uhci_hcd:usb3
  23:          0          0          0          0   IO-APIC-fasteoi   uhci_hcd:usb5
  65:         37         35         36         35   PCI-MSI-edge      snd_hda_intel
  66:          1          0          0          2   PCI-MSI-edge      eth0
 NMI:          0          0          0          0   Non-maskable interrupts
 LOC:      15559      16094      16099      15744   Local timer interrupts
 SPU:          0          0          0          0   Spurious interrupts
 PMI:          0          0          0          0   Performance monitoring interrupts
 IWI:          0          0          0          0   IRQ work interrupts
 RTR:          0          0          0          0   APIC ICR read retries
 RES:       3554       2081       2352       1626   Rescheduling interrupts
 CAL:       1455       1445       2263       2244   Function call interrupts
 TLB:          0          0          0          0   TLB shootdowns
 TRM:          0          0          0          0   Thermal event interrupts
 THR:          0          0          0          0   Threshold APIC interrupts
 MCE:          0          0          0          0   Machine check exceptions
 MCP:          1          1          1          1   Machine check polls
 ERR:          0
 MIS:          0

It's a mystery why the I3 and I5 differ so drastically :?
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PostPosted: Sun Dec 30, 2012 11:28 pm    Post subject: Reply with quote

odd. Can you paste the configs of all systems to narrow down the problem?

Mm.. according to some intarwebz comments could be two things:

Turn these two off:
Code:
CONFIG_HOTPLUG_CPU=y
CONFIG_ACPI_HOTPLUG_CPU=y


I doubt this cuz my IRQs are all distributed with these options on.

A comment on this post http://www.alexonlinux.com/smp-affinity-and-proper-interrupt-handling-in-linux mentions,

Code:
CONFIG_X86_X2APIC


which seems more correct. Try the later one.

And maybe this as well?

Code:
CONFIG_IRQ_REMAP


Last edited by _______0 on Mon Dec 31, 2012 12:05 am; edited 1 time in total
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PostPosted: Sun Dec 30, 2012 11:52 pm    Post subject: Reply with quote

_______0 wrote:
odd. Can you paste the configs of all systems to narrow down the problem?

_______0,

For all it's worth:

Core(TM) i3-2350M CPU @ 2.30GHz laptop http://bpaste.net/show/67350/

AMD Phenom(tm) 9150e Quad-Core Processor desktop http://bpaste.net/show/67351/

Dual Xeon(R) CPU 5160 @ 3.00GHz http://bpaste.net/show/67352/

The xeon machine is old and neglected. I refreshed it with a clean install several months ago.

It was just intended to be used to backup files from the AMD and laptop, but over time, it morphed into a crippled desktop - maybe neglect is the secret :D
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PostPosted: Mon Dec 31, 2012 12:32 am    Post subject: Reply with quote

I think I found it:

Code:
CONFIG_SMP


try that one along with:

Code:
CONFIG_X86_X2APIC


and possibly try this in kernel boot params:

Quote:
x2apic_phys [X86-64,APIC] Use x2apic physical mode instead of
default x2apic cluster mode on platforms
supporting x2apic.
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PostPosted: Mon Dec 31, 2012 12:36 am    Post subject: Reply with quote

try to set this one on:

Code:
# CONFIG_IRQ_REMAP is not set
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PostPosted: Mon Dec 31, 2012 12:50 am    Post subject: Reply with quote

_______0 wrote:
SlashBeast wrote:

Because its a Debian.


I fail to see how's that's a gentoo problem then.
.

Uh huh... I said I saw it too on i7 sandy bridge debian. I do run into this issue regardless of distro on newer intel chips.

_______0 wrote:
This is how ALL devices should appear like:
Code:
 16:        257        257        258 IO-APIC-fasteoi   snd_hda_intel

You don't say!

And of course every and each of the kernels here have SMP support enabled, without it you can't even see more than CPU0 ...
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PostPosted: Mon Dec 31, 2012 1:24 am    Post subject: Reply with quote

_______0,

I had high hopes, but:

Code:
laptop linux # diff .config .config.save
314d313
< CONFIG_X86_X2APIC=y
2442c2441
< CONFIG_IRQ_REMAP=y
---
> # CONFIG_IRQ_REMAP is not set


Config changes:
Code:
Device drivers
   IOMMU Hardware Support
      Support for Interrupt Remapping (EXPERIMENTAL)

Processor type and features
    Support x2apic


And the results:
Code:
bill@laptop ~ $ cat /proc/interrupts
           CPU0       CPU1       CPU2       CPU3       
  0:        121          0          0          0   IO-APIC-edge      timer
  1:         82          0          0          0   IO-APIC-edge      i8042
  8:          1          0          0          0   IO-APIC-edge      rtc0
  9:          0          0          0          0   IO-APIC-fasteoi   acpi
 12:       1363          0          0          0   IO-APIC-edge      i8042
 16:        540          0          0          0   IO-APIC-fasteoi   ehci_hcd:usb1
 19:        827          0          0          0   IO-APIC-fasteoi   ath9k
 23:        389          0          0          0   IO-APIC-fasteoi   ehci_hcd:usb2
 41:       6889          0          0          0   PCI-MSI-edge      ahci
 42:          0          0          0          0   PCI-MSI-edge      eth0
 43:        551          0          0          0   PCI-MSI-edge      snd_hda_intel
 44:         13          0          0          0   PCI-MSI-edge      i915
NMI:          0          0          0          0   Non-maskable interrupts
LOC:      19254      13568      11128      11235   Local timer interrupts
SPU:          0          0          0          0   Spurious interrupts
PMI:          0          0          0          0   Performance monitoring interrupts
IWI:          0          0          0          0   IRQ work interrupts
RTR:          2          0          0          0   APIC ICR read retries
RES:        954        527        607        284   Rescheduling interrupts
CAL:        906        891        864        787   Function call interrupts
TLB:          0          0          0          0   TLB shootdowns
TRM:          0          0          0          0   Thermal event interrupts
THR:          0          0          0          0   Threshold APIC interrupts
MCE:          0          0          0          0   Machine check exceptions
MCP:          2          2          2          2   Machine check polls
ERR:          0
MIS:          0

Well, I'm still :cry: Good try though :D
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PostPosted: Mon Dec 31, 2012 2:02 am    Post subject: Reply with quote

woah! This is getting more interesting by the minute!!

Although the ultimate option might be change to amd proc for proper /proc/interrupt sake, until then we should find out WHY late intels have this odd behaviour.

lol@this:

Code:
IWI:          0          0          0          0   IRQ work interrupts


On mine there's activity, and evenly spread out (as proper) over cores.

I wonder whether has to do with timer used:

Code:
cat /sys/bus/clocksource/devices/clocksource0/current_clocksource


Could you try booting with these kernel parameters??

Code:
hpet=force x2apic_phys


ps: how did you put ahci on an MSI interrupt??
ps2: what about some un-obvious BIOS/UEFI settings?

This gentoo fella http://forums.gentoo.org/viewtopic-t-937042-start-0.html has it right on his i5, according to his uname but his sig says i7:

eccerr0r wrote:
Is it like this on fresh boot? Single user mode?

Do you have any special hardware? Can the drivers be removed one at a time to see if any of the drivers require frequent interrupts by the clock tick timer?

Do you have HPET enabled on the newer machines? APIC?

Hmm... thought I had a 3.4.9 machine, and doesn't seem to be exhibiting interrupt storm in hw INT0... But I get a lot of local interrupts...

Code:
mikuru $ uname -a
Linux mikuru 3.4.9-gentoo #2 SMP Sun Aug 26 09:37:03 MDT 2012 x86_64 Intel(R) Core(TM) i5-3317U CPU @ 1.70GHz GenuineIntel GNU/Linux
mikuru $ cat /proc/interrupts
           CPU0       CPU1       CPU2       CPU3       
  0:        127          0          0          0   IO-APIC-edge      timer
  1:        292       9536        146        311   IO-APIC-edge      i8042
  8:          2         11          0          0   IO-APIC-edge      rtc0
  9:        250        205          5         85   IO-APIC-fasteoi   acpi
 12:       7240     260815       3375       7179   IO-APIC-edge      i8042
 16:         84        132         30         38   IO-APIC-fasteoi   ehci_hcd:usb1
 23:          0         23          5          4   IO-APIC-fasteoi   ehci_hcd:usb2
 40:       5886       9660       3690       2082   PCI-MSI-edge      i915
 41:      19673      16300       4217       5245   PCI-MSI-edge      ahci
 42:      12821      30427       9406       4772   PCI-MSI-edge      xhci_hcd
 43:       6457      24409       3702       3569   PCI-MSI-edge      snd_hda_intel
 44:          0          0          0          0   PCI-MSI-edge      eth0
 45:      70034     267897      31547      40622   PCI-MSI-edge      iwlwifi
NMI:          0          0          0          0   Non-maskable interrupts
LOC:     688301     412667     713302     374754   Local timer interrupts
SPU:          0          0          0          0   Spurious interrupts
PMI:          0          0          0          0   Performance monitoring interrupts
IWI:          0          0          0          0   IRQ work interrupts
RTR:          3          0          0          0   APIC ICR read retries
RES:     389680     266397      32705      15704   Rescheduling interrupts
CAL:         67         82         73         77   Function call interrupts
TLB:      11227      13067       8305      12849   TLB shootdowns
TRM:          8          8          8          8   Thermal event interrupts
THR:          0          0          0          0   Threshold APIC interrupts
MCE:          0          0          0          0   Machine check exceptions
MCP:         19         19         19         19   Machine check polls
ERR:          0
MIS:          0
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PostPosted: Mon Dec 31, 2012 2:35 am    Post subject: Reply with quote

_______0,

Code:
bill@laptop /proc $ cat cmdline
BOOT_IMAGE=/boot/kernel root=/dev/sda8 rootfstype=ext3 hpet=force x2apic_phys ro

bill@laptop ~ $ cat /proc/interrupts
           CPU0       CPU1       CPU2       CPU3       
  0:        122          0          0          0   IO-APIC-edge      timer
  1:         54          0          0          0   IO-APIC-edge      i8042
  8:          1          0          0          0   IO-APIC-edge      rtc0
  9:          0          0          0          0   IO-APIC-fasteoi   acpi
 12:        487          0          0          0   IO-APIC-edge      i8042
 16:        436          0          0          0   IO-APIC-fasteoi   ehci_hcd:usb1
 19:       1643          0          0          0   IO-APIC-fasteoi   ath9k
 23:        270          0          0          0   IO-APIC-fasteoi   ehci_hcd:usb2
 41:       6538          0          0          0   PCI-MSI-edge      ahci
 42:          0          0          0          0   PCI-MSI-edge      eth0
 43:         12          0          0          0   PCI-MSI-edge      i915
 44:        550          0          0          0   PCI-MSI-edge      snd_hda_intel
NMI:          0          0          0          0   Non-maskable interrupts
LOC:      17806      10814      11136      10214   Local timer interrupts
SPU:          0          0          0          0   Spurious interrupts
PMI:          0          0          0          0   Performance monitoring interrupts
IWI:          0          0          0          0   IRQ work interrupts
RTR:          2          0          0          0   APIC ICR read retries
RES:       1159        518        432        222   Rescheduling interrupts
CAL:        572        554        567        492   Function call interrupts
TLB:          0          0          0          0   TLB shootdowns
TRM:          0          0          0          0   Thermal event interrupts
THR:          0          0          0          0   Threshold APIC interrupts
MCE:          0          0          0          0   Machine check exceptions
MCP:          2          2          2          2   Machine check polls
ERR:          0
MIS:          0

No cigar here :?

UPDATE: Almost forgot
Code:
bill@laptop /proc $ cat /sys/bus/clocksource/devices/clocksource0/current_clocksource
tsc

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PostPosted: Mon Dec 31, 2012 3:08 am    Post subject: Reply with quote

BillWho wrote:

UPDATE: Almost forgot
Code:
bill@laptop /proc $ cat /sys/bus/clocksource/devices/clocksource0/current_clocksource
tsc


oops I forgot this to add in kernel parameters:

Code:
clocksource=hpet


In dmesg you should see this:

Code:
Switching to clocksource hpet


Mmm... what does dmesg say about x2apic?? I am curious.

Also i8042 can be disabled in BIOS/UEFI (serial/parallel port) and in kernel config uncheck keyboard and ps/m mouse, no modern machine use none of those. Safe to get rid of them.
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