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    SubjectRE: [RFT][PATCH v7 5/8] cpuidle: Return nohz hint from cpuidle_select()
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    On 2018.03.21 11:00 Thomas Ilsche wrote:
    > On 2018-03-21 15:36, Rafael J. Wysocki wrote:
    >>
    >> So please disregard this one entirely and take the v7.2 replacement
    >> instead of it:https://patchwork.kernel.org/patch/10299429/
    >>
    >> The current versions (including the above) is in the git branch at
    >>
    >> git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git \
    >> idle-loop-v7.2
    >
    > With v7.2 (tested on SKL-SP from git) I see similar behavior in idle
    > as with v5: several cores which just keep the sched tick enabled.
    > Worse yet, some go only in C1 (not even C1E!?) despite sleeping the
    > full sched tick.
    > The resulting power consumption is ~105 W instead of ~ 70 W.
    >
    > https://wwwpub.zih.tu-dresden.de/~tilsche/powernightmares/v7_2_skl_sp_idle.png
    >
    > I have briefly ran v7 and I believe it was also affected.

    I am not able to repeat your issues anymore.
    Idle powers were fine with V7, on my test computer.
    I have not done thorough idle tests with V7.2, but they looked O.K.

    As for the high frequency loop stuff, I no longer see any issues there
    either. I tried several loops frequencies, and did one for a couple of hours.

    I'll try again later today, as there is a test running now (frequency sweep)
    that takes about 4 hours.

    ... Doug


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