Re: [PATCH 4/4] sched/fair: Use a recently used CPU as an idle candidate and the basis for SIS

[Peter Zijlstra]

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.