lkml.org 
[lkml]   [2018]   [Jan]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 4/4] sched/fair: Use a recently used CPU as an idle candidate and the basis for SIS
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

\
 
 \ /
  Last update: 2018-01-30 14:20    [W:3.587 / U:2.256 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site