From: Light <sgsdxzy@gmail.com>
To: linux-kernel@vger.kernel.org
Subject: Intel_pstate: One Core always 100% C0 state and never scale down
Date: Thu, 04 Jul 2013 11:43:40 +0800 [thread overview]
Message-ID: <51D4EF6C.9040808@gmail.com> (raw)
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!
next reply other threads:[~2013-07-04 3:42 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-04 3:43 Light [this message]
2013-07-05 5:44 ` Intel_pstate: One Core always 100% C0 state and never scale down Light
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