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SubjectRe: 50 Watt idle power regression bisected to Linux-3.10
On Sat, Dec 7, 2013 at 3:39 AM, Mike Galbraith <> wrote:
> On Sat, 2013-12-07 at 03:00 -0500, Len Brown wrote:
>> No, Linux-3.13-rc3 does not fix this issue, even though it contains
>> the following patch, claiming to address an issue with the commit above:
>> commit ea8117478918a4734586d35ff530721b682425be
>> Author: Peter Zijlstra <>
>> Date: Wed Sep 11 12:43:13 2013 +0200
>> sched, idle: Fix the idle polling state logic
>> Mike reported that commit 7d1a9417 ("x86: Use generic idle loop")
>> regressed several workloads and caused excessive reschedule
>> interrupts.
> It fixes that, except for my Q6600 box. Too bad mwait_idle() went away,
> beloved old box doesn't play hints game, so it continues to flog itself.

Hi Mike,
What C-states are available on your Q6600 box?
Is it running HALT only?
(if so, I would expect C1 MWAIT be about the same, if it still existed)

But I would expect the box to have deeper C-states than just C1, so...

Can you show me the output of
dmesg | grep idle
grep . /sys/devices/system/cpu/cpu0/cpuidle/*/*

Please elaborate on exactly what symptom you see.
Do you have a power meter?

Len Brown, Intel Open Source Technology Center

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