how to set ondemand governor

how to set ondemand governor

[Nebojsa Trpkovic]

I've got Core 2 Duo CPU and tried to set ondemand governor. result that
I've got shows that only one core is affected:

> titan old # echo -n "ondemand" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
> titan old # cat /proc/cpuinfo
> processor       : 0
> vendor_id       : GenuineIntel
> cpu family      : 6
> model           : 15
> model name      : Intel(R) Core(TM)2 Duo CPU     E6550  @ 2.33GHz
> stepping        : 11
> cpu MHz         : 2000.000
> cache size      : 4096 KB
> physical id     : 0
> siblings        : 2
> core id         : 0
> cpu cores       : 2
> 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 pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm constant_tsc pni monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr lahf_lm
> bogomips        : 4669.25
> clflush size    : 64
> cache_alignment : 64
> address sizes   : 36 bits physical, 48 bits virtual
> power management:
> 
> processor       : 1
> vendor_id       : GenuineIntel
> cpu family      : 6
> model           : 15
> model name      : Intel(R) Core(TM)2 Duo CPU     E6550  @ 2.33GHz
> stepping        : 11
> cpu MHz         : 2333.000
> cache size      : 4096 KB
> physical id     : 0
> siblings        : 2
> core id         : 1
> cpu cores       : 2
> 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 pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm constant_tsc pni monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr lahf_lm
> bogomips        : 4666.81
> clflush size    : 64
> cache_alignment : 64
> address sizes   : 36 bits physical, 48 bits virtual
> power management:
> 
> titan old #                                    


does this mean that I should (and can) set different governors/variables
for different cores of my CPU ?

Re: how to set ondemand governor

[Jarod Wilson]

[-- Attachment #1.1: Type: text/plain, Size: 746 bytes --]

Nebojsa Trpkovic wrote:
> I've got Core 2 Duo CPU and tried to set ondemand governor. result that
> I've got shows that only one core is affected:
> 
>> titan old # echo -n "ondemand" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

Note that the path you're echoing into contains 'cpu0'...

> does this mean that I should (and can) set different governors/variables
> for different cores of my CPU ?

I suppose you can, but its a little batty (never actually tried myself).
In fedora-land, we have an initscript that defaults to setting ondemand
for all cpus. Part of the setup is to essentially echo 'ondemand' into
the scaling_governor sysfs file for each cpu on the system.

-- 
Jarod Wilson
jwilson@redhat.com



[-- Attachment #1.2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 251 bytes --]

[-- Attachment #2: Type: text/plain, Size: 147 bytes --]

_______________________________________________
Cpufreq mailing list
Cpufreq@lists.linux.org.uk
http://lists.linux.org.uk/mailman/listinfo/cpufreq

Re: how to set ondemand governor

[Thomas Renninger]

On Mon, 2007-08-06 at 22:19 +0200, Nebojsa Trpkovic wrote:

> does this mean that I should (and can) set different governors/variables
> for different cores of my CPU ?
Unfortunately, yes.

   Thomas