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ToeiRei
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Joined: 03 Jan 2005
Posts: 1191
Location: Austria
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 Posted: Thu Jul 25, 2013 4:43 pm Post subject: Very bad performance with recent kernels |
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Hi guys,
I am facing the problem, that my laptop performance gets worse every new kernel version. Recently I discovered ksoftirqd (8 processes!) hogging up most of the CPU.
The box is a Lenovo Thinkpad W530
| Code: | freya ~ # lspci
00:00.0 Host bridge: Intel Corporation 3rd Gen Core processor DRAM Controller (rev 09)
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor PCI Express Root Port (rev 09)
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
00:14.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB xHCI Host Controller (rev 04)
00:16.0 Communication controller: Intel Corporation 7 Series/C210 Series Chipset Family MEI Controller #1 (rev 04)
00:19.0 Ethernet controller: Intel Corporation 82579LM Gigabit Network Connection (rev 04)
00:1a.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #2 (rev 04)
00:1b.0 Audio device: Intel Corporation 7 Series/C210 Series Chipset Family High Definition Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 1 (rev c4)
00:1c.1 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 2 (rev c4)
00:1c.2 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 3 (rev c4)
00:1d.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation QM77 Express Chipset LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation 7 Series Chipset Family 6-port SATA Controller [AHCI mode] (rev 04)
00:1f.3 SMBus: Intel Corporation 7 Series/C210 Series Chipset Family SMBus Controller (rev 04)
01:00.0 VGA compatible controller: NVIDIA Corporation GK107GLM [Quadro K2000M] (rev a1)
02:00.0 System peripheral: Ricoh Co Ltd MMC/SD Host Controller (rev 08)
02:00.3 FireWire (IEEE 1394): Ricoh Co Ltd R5C832 PCIe IEEE 1394 Controller (rev 04)
03:00.0 Network controller: Intel Corporation Centrino Ultimate-N 6300 (rev 3e)
freya ~ # |
Kernel Config: http://bpaste.net/show/117296/
any ideas?
regards
Rei
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DONAHUE
Watchman
Joined: 09 Dec 2006
Posts: 7651
Location: Goose Creek SC
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DONAHUE
Watchman
Joined: 09 Dec 2006
Posts: 7651
Location: Goose Creek SC
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| Posted: Thu Jul 25, 2013 5:31 pm Post subject: |
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dupe
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Last edited by DONAHUE on Sun Jul 28, 2013 3:00 pm; edited 1 time in total |
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ToeiRei
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Joined: 03 Jan 2005
Posts: 1191
Location: Austria
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| Posted: Sun Jul 28, 2013 2:46 pm Post subject: |
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this is pretty weird. Looks like the tickless system is an issue
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handsoul
n00b
Joined: 20 Mar 2012
Posts: 10
Location: Xi'an
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| Posted: Sat Aug 24, 2013 3:40 pm Post subject: CONFIG_NO_HZ_FULL seems to cause the problem. |
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for kernel version >= 3.10, Set the option as following might help.
| Code: | General setup >
Timers subsystem->
Timer tick handling (Idle dynticks system (tickless idle)) ->
( ) Periodic timer ticks (constant rate, no dynticks)
(X) Idle dynticks system (tickless idle)
( ) Full dynticks system (tickless)
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if you choose "Full dynticks system" here , wired things might happen: all cores keep runing at the full frequence , and cpu frequence scaling settings do not have any effect. I've no idea about this. The problem's seen on i3-2330M. |
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platojones
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Joined: 23 Oct 2002
Posts: 1602
Location: Just over the horizon
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| Posted: Sat Aug 24, 2013 4:10 pm Post subject: |
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| ToeiRei wrote: | | this is pretty weird. Looks like the tickless system is an issue |
According to Linus, full-tickless is not quite ready for prime time...it's evolving, but not there yet:
http://lwn.net/Articles/549580/ |
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