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Re: [PATCH 03/16] sched/fair: Disregard idle task wakee_flips in wake_wide

From Mike Galbraith <mgalbraith@suse.de>
Newsgroups linux.kernel
Subject Re: [PATCH 03/16] sched/fair: Disregard idle task wakee_flips in wake_wide
Date 2016-05-23 15:10 +0200
Message-ID <rBXMn-6ir-41@gated-at.bofh.it> (permalink)
References <rBVKx-4Lf-3@gated-at.bofh.it> <rBVKy-4Lf-31@gated-at.bofh.it> <rBW3U-56T-21@gated-at.bofh.it> <rBWGB-5k6-1@gated-at.bofh.it>
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On Mon, 2016-05-23 at 13:00 +0100, Morten Rasmussen wrote:

> The problem then seems to be distinguishing truly idle and busy doing
> interrupts. The issue that I observe is that wake_wide() likes pushing
> tasks around in lightly scenarios which isn't desirable for power
> management. Selecting the same cpu again may potentially let others
> reach deeper C-state.
> 
> With that in mind I will if I can do better. Suggestions are welcome :-)

None here.  For big boxen that are highly idle, you'd likely want to
shut down nodes and consolidate load, but otoh, all that slows response
to burst, which I hate.  I prefer race to idle, let power gating do its
job.  If I had a server farm with enough capacity vs load variability
to worry about, I suspect I'd become highly interested in routing.

	-Mike

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[PATCH 03/16] sched/fair: Disregard idle task wakee_flips in wake_wide Morten Rasmussen <morten.rasmussen@arm.com> - 2016-05-23 13:00 +0200
  Re: [PATCH 03/16] sched/fair: Disregard idle task wakee_flips in  wake_wide Mike Galbraith <mgalbraith@suse.de> - 2016-05-23 13:20 +0200
    Re: [PATCH 03/16] sched/fair: Disregard idle task wakee_flips in  wake_wide Morten Rasmussen <morten.rasmussen@arm.com> - 2016-05-23 14:00 +0200
      Re: [PATCH 03/16] sched/fair: Disregard idle task wakee_flips in  wake_wide Mike Galbraith <mgalbraith@suse.de> - 2016-05-23 15:10 +0200
        Re: [PATCH 03/16] sched/fair: Disregard idle task wakee_flips in  wake_wide Morten Rasmussen <morten.rasmussen@arm.com> - 2016-05-23 16:20 +0200
          Re: [PATCH 03/16] sched/fair: Disregard idle task wakee_flips in  wake_wide Mike Galbraith <mgalbraith@suse.de> - 2016-05-23 17:50 +0200
            Re: [PATCH 03/16] sched/fair: Disregard idle task wakee_flips in  wake_wide Yuyang Du <yuyang.du@intel.com> - 2016-05-24 09:20 +0200
      Re: [PATCH 03/16] sched/fair: Disregard idle task wakee_flips in  wake_wide Yuyang Du <yuyang.du@intel.com> - 2016-05-24 09:10 +0200

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