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SubjectRe: [PATCH] sched: Reduce contention in update_cfs_rq_blocked_load
On Thu, Aug 07, 2014 at 09:18:52PM -0700, Jason Low wrote:
> On Fri, 2014-08-08 at 02:02 +0800, Yuyang Du wrote:
> > On Wed, Aug 06, 2014 at 11:21:35AM -0700, Jason Low wrote:
> > > I ran these tests with most of the AIM7 workloads to compare its
> > > performance between a 3.16 kernel and the kernel with these patches
> > > applied.
> > >
> > > The table below contains the percent difference between the baseline
> > > kernel and the kernel with the patches at various user counts. A
> > > positive percent means the kernel with the patches performed better,
> > > while a negative percent means the baseline performed better.
> > >
> > > Based on these numbers, for many of the workloads, the change was
> > > beneficial in those highly contended, while it had - impact in many
> > > of the lightly/moderately contended case (10 to 90 users).
> > >
> > > -----------------------------------------------------
> > > | 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, Jason. Sorry for late response.
> >
> > What about the variation of the tests? The machine you test on?
>
> Hi Yuyang,
>
> These tests were also done on an 8 socket machine (80 cores). In terms
> of variation between the average throughputs, typically the noise range
> is about 2% in many of the workloads.
>

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.

Yuyang


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