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SubjectRe: [PATCH] sched: Reduce contention in update_cfs_rq_blocked_load
On Fri, Aug 08, 2014 at 07:15:35AM +0800, Yuyang Du wrote:
> On Fri, Aug 08, 2014 at 09:11:03AM +0200, Peter Zijlstra wrote:
> > On Fri, Aug 08, 2014 at 06:30:08AM +0800, Yuyang Du wrote:
> > > > > > -----------------------------------------------------
> > > > > > | 10-90 | 100-1000 | 1100-2000
> > > > > > | users | users | users
> > > > > > -----------------------------------------------------
> > > > > > alltests | -3.37% | -10.64% | -2.25%
> > > > > > -----------------------------------------------------
> > > > > > all_utime | +0.33% | +3.73% | +3.33%
> > > > > > -----------------------------------------------------
> > > > > > compute | -5.97% | +2.34% | +3.22%
> > > > > > -----------------------------------------------------
> > > > > > custom | -31.61% | -10.29% | +15.23%
> > > > > > -----------------------------------------------------
> > > > > > disk | +24.64% | +28.96% | +21.28%
> > > > > > -----------------------------------------------------
> > > > > > fserver | -1.35% | +4.82% | +9.35%
> > > > > > -----------------------------------------------------
> > > > > > high_systime | -6.73% | -6.28% | +12.36%
> > > > > > -----------------------------------------------------
> > > > > > shared | -28.31% | -19.99% | -7.10%
> > > > > > -----------------------------------------------------
> > > > > > short | -44.63% | -37.48% | -33.62%
> > > > > > -----------------------------------------------------
> >
> > > Thanks a lot, Jason.
> > >
> > > So for this particular set of workloads on a big machine, I think the
> > > result is mixed and overall "neutral", but I expected the variation probably
> > > could be bigger especially for light workloads.
> > >
> > > Any comment from the maintainers and others? Ping Peter and Ben, I haven't
> > > heard from you for the 5th version.
> >
> > Been a bit busy.. but in general I worry about the performance decrease
> > on the lighter loads. I should probably run some workloads on my 2
> > socket and 4 socket machines, but the coming few weeks will be very busy
> > and I'm afraid I'll not get around to it in a timely manner.
>
> Ok. I understand. From our part, Fengguang's LKP does not include light loads,
> we also need some such tests to confirm this and see what is next.
>
> Since typical benchmarks would be heavy ones, what do you suggest for light loads?
>
> Jason, possible you can share some of your workloads?
>
Just heard from Fengguang, LKP has AIM7, which is not private workload. We will do
it. Thanks, Jason.

+Fengguang


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