Re: [PATCH] sched: Reduce contention in update_cfs_rq_blocked_load

[Yuyang Du]

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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