Messages in this thread | | | Subject | Re: [PATCH] sched: Reduce contention in update_cfs_rq_blocked_load | From | Jason Low <> | Date | Wed, 06 Aug 2014 11:21:35 -0700 |
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On Tue, 2014-08-05 at 03:15 +0800, Yuyang Du wrote: > Hi Jason, > > I am not sure whether you noticed my latest work: rewriting per entity load average > > http://article.gmane.org/gmane.linux.kernel/1760754 > http://article.gmane.org/gmane.linux.kernel/1760755 > http://article.gmane.org/gmane.linux.kernel/1760757 > http://article.gmane.org/gmane.linux.kernel/1760756 > > which simply does not track blocked load average at all. Are you interested in > testing the patchset with the workload you have?
Hi Yuyang,
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% -----------------------------------------------------
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