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
