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Gentlenoob
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Joined: 10 Apr 2008
Posts: 15

PostPosted: Thu Sep 18, 2014 8:23 am    Post subject: CONFIG_HIGH_RES_TIMERS results in high temperature Reply with quote

Hi all,

when I set CONFIG_HIGH_RES_TIMERS on my nearly 8 year old core 2 laptop its idle temperature is reproducibly higher than without that option, resulting in permanently running fans. top however doesn't show anything unusual. Before posting lengthy configs etc.: Any quick tips/hints/links? How necessary is this option anyway? Right now I may need it only for skype/pulseaudio, the latter warning about it missing.

Thanks in advance...
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charles17
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Joined: 02 Mar 2008
Posts: 686

PostPosted: Thu Sep 18, 2014 9:15 am    Post subject: Re: CONFIG_HIGH_RES_TIMERS results in high temperature Reply with quote

Did you consult the kernel help?
CONFIG_HIGH_RES_TIMERS: wrote:
This option enables high resolution timer support. If your
hardware is not capable then this option only increases
the size of the kernel image.

Sorry for not being a big help. I wonder how I could check if my hardware had this capability.
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Hu
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Joined: 06 Mar 2007
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PostPosted: Thu Sep 18, 2014 10:07 pm    Post subject: Reply with quote

Is the idle temperature higher even when not running any of the programs which request it, such as just after login with no programs open?
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Gentlenoob
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PostPosted: Fri Sep 19, 2014 7:05 am    Post subject: Reply with quote

charles17: Yes, I saw that help. Don't know for myself if my box has that capability. I hadn't enabled it up to now and obviously didn't miss it until I got the warning when emerging pulseaudio (which I didn't need up to now as well).

Hu: Yes, that's the behaviour. I reboot with the CONFIG_HIGH_RES_TIMERS enabled kernel, don't start anything fancy/unusual afaik (X maybe?), but nevertheless the fans start and never stop, and the box gets notably warmer than usual, confirmed by 'sensors'.

I probably should have been a bit more specific, please ask for more if needed.
Code:

uname -a
Linux localhost 3.14.16-gentoo #5 SMP Wed Sep 17 18:05:27 CEST 2014 i686 Genuine Intel(R) CPU T2250 @ 1.73GHz GenuineIntel GNU/Linux


Code:

cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 14
model name      : Genuine Intel(R) CPU           T2250  @ 1.73GHz
stepping        : 8
microcode       : 0x39
cpu MHz         : 1733.000
cache size      : 2048 KB
physical id     : 0
siblings        : 2
core id         : 0
cpu cores       : 2
apicid          : 0
initial apicid  : 0
fdiv_bug        : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 10
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx constant_tsc arch_perfmon bts aperfmperf pni monitor est tm2 xtpr pdcm dtherm
bogomips        : 3457.76
clflush size    : 64
cache_alignment : 64
address sizes   : 32 bits physical, 32 bits virtual
power management:

processor       : 1
vendor_id       : GenuineIntel
cpu family      : 6
model           : 14
model name      : Genuine Intel(R) CPU           T2250  @ 1.73GHz
stepping        : 8
microcode       : 0x39
cpu MHz         : 1733.000
cache size      : 2048 KB
physical id     : 0
siblings        : 2
core id         : 1
cpu cores       : 2
apicid          : 1
initial apicid  : 1
fdiv_bug        : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 10
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx constant_tsc arch_perfmon bts aperfmperf pni monitor est tm2 xtpr pdcm dtherm
bogomips        : 3457.76
clflush size    : 64
cache_alignment : 64
address sizes   : 32 bits physical, 32 bits virtual
power management:

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