Messages in this thread | | | Subject | Re: [PATCH] sched: Reduce contention in update_cfs_rq_blocked_load | From | Jason Low <> | Date | Thu, 07 Aug 2014 21:18:52 -0700 |
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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.
Jason
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