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    SubjectRe: 50 Watt idle power regression bisected to Linux-3.10
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    On Sat, Dec 7, 2013 at 3:39 AM, Mike Galbraith <bitbucket@online.de> 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 <peterz@infradead.org>
    >> 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?

    thanks,
    Len Brown, Intel Open Source Technology Center


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