Messages in this thread | | | Date | Tue, 30 Jan 2018 13:18:59 +0000 | From | Mel Gorman <> | Subject | Re: [PATCH 4/4] sched/fair: Use a recently used CPU as an idle candidate and the basis for SIS |
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On Tue, Jan 30, 2018 at 02:06:06PM +0100, Peter Zijlstra wrote: > On Tue, Jan 30, 2018 at 12:53:49PM +0100, Peter Zijlstra wrote: > > On Tue, Jan 30, 2018 at 10:45:55AM +0000, Mel Gorman wrote: > > > The results can be less dramatic on NUMA where automatic balancing interferes > > > with the test. It's also known that network benchmarks running on localhost > > > also benefit quite a bit from this patch (roughly 10% on netperf RR for UDP > > > and TCP depending on the machine). Hackbench also seens small improvements > > > (6-11% depending on machine and thread count). The facebook schbench was also > > > tested but in most cases showed little or no different to wakeup latencies. > > > > What cpufreq setting were you using for these tests? > > I cannot measure any hackbench variation one way or the other with these > patches using 'performance' mode. So I'll assume you've been running > things with HWP or something.
Correct, I am not using the performance governor as it's not the default and not necessarily desirable as a default. HWP in some cases is enabled but even machines using the intel_pstate driver on machines without HWP benefit.
-- Mel Gorman SUSE Labs
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