Re: [PATCH] sched: wake-affine throttle

From: Paul Turner
Date: Mon Apr 22 2013 - 13:50:27 EST


On Mon, Apr 22, 2013 at 3:23 AM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
>
> OK,.. Ingo said that pipe-test was the original motivation for
> wake_affine() and since that's currently broken to pieces due to
> select_idle_sibling() is there still a benefit to having it at all?
>
> Can anybody find any significant regression when simply killing
> wake_affine()?
>

This matches our experience; we've always tuned toward a more
aggressive select_idle_sibling() for in-socket wake-ups.

We did recently turn it back on in the cross-socket case (e.g.
SD_NODE) however as we were able to observe a benefit on a few
workloads.
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