Messages in this thread | | | Date | Fri, 05 Jul 2013 13:44:42 +0800 | From | Light <> | Subject | Re: Intel_pstate: One Core always 100% C0 state and never scale down |
| |
On 07/04/2013 11:43 AM, Light wrote: > I am using a laptop with Intel Ivy bridge core i7 3610QM. I updated my > kernel to 3.10 and started to use intel_pstate as scaling driver: > #cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver > intel_pstate > > However I find that one of my four cores is always in C0 state even > when there is no activities. I monitored it using i7z: > Core [core-id] :Actual Freq (Mult.) C0% Halt(C1)% C3 % C6 % > C7 % Temp > Core 1 [0]: 3288.24 (32.97x) 99.7 0 0 > 0 0 83 > Core 2 [1]: 3138.62 (31.47x) 1 0 0 > 0 99.7 74 > Core 3 [2]: 3175.46 (31.84x) 1 0.891 0 > 0 99 76 > Core 4 [3]: 3177.34 (31.86x) 1 0.21 0 > 0 99.3 71 > > Also cpu frequencies never scale down, resulting in very high temp. > #cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor > powersave > > It does say powersave, and my cpu is capable of 1.20Ghz to 3.30Ghz > > I don't know if I misconfigured or misunderstood something. Can > someone tell me why? > Thanks! Switching to dynticks Idle fixed the problem. But I am still wondering if it were a bug with full dynticks...
| |