Re: [RFC PATCH] sched: smart wake-affine
From: Mike Galbraith
Date: Sun Jun 02 2013 - 23:09:22 EST
On Mon, 2013-06-03 at 10:28 +0800, Michael Wang wrote:
> On 05/28/2013 01:05 PM, Michael Wang wrote:
> > wake-affine stuff is always trying to pull wakee close to waker, by theory,
> > this will bring benefit if waker's cpu cached hot data for wakee, or the
> > extreme ping-pong case.
> > And testing show it could benefit hackbench 15% at most.
> > However, the whole stuff is somewhat blindly and time-consuming, some
> > workload therefore suffer.
> > And testing show it could damage pgbench 50% at most.
> > Thus, wake-affine stuff should be smarter, and realise when to stop
> > it's thankless effort.
> Is there any comments?
(I haven't had time to test-drive yet, -rt munches time like popcorn)
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