On Saturday, November 10, 2018 8:10:01 PM CET Giovanni Gherdovich wrote: > On Thu, 2018-11-08 at 18:25 +0100, Rafael J. Wysocki wrote: > > From: Rafael J. Wysocki <rafael.j.wyso...@intel.com> > > Subject: [PATCH] cpuidle: New timer events oriented governor for tickless > > systems > >
[cut] > [NOTE: the tables in this message are quite wide, ~130 columns. If this > doesn't get to you properly formatted you can read a copy of this message at > the URL https://beta.suse.com/private/ggherdovich/teo-eval/teo-eval.html ] > > > Hello Rafael, > > I have results for v3 and v5. Regarding v4, I made a mistake and didn't get > valid data; as I saw v5 coming shortly after, I didn't rerun v4. > > I'm replying to the v5 thread because that's where these results belong, but > I'm quoting your text from the v2 email at > https://lore.kernel.org/lkml/4168371.zz0pvzt...@aspire.rjw.lan so that's > easier to follow along. Thanks for the results, much appreciated! > The quick summary is: > > ---> sockperf on loopback over UDP, mode "throughput": > this had a 12% regression in v2 on 48x-HASWELL-NUMA, which is completely > recovered in v3 and v5. Good stuff. That's good news, thanks! > ---> dbench on xfs: > this was down 16% in v2 on 48x-HASWELL-NUMA. On v5 we're at a 10% > regression. Slight improvement. What's really hurting here is the single > client scenario. > > ---> netperf-udp on loopback: > had 6% regression on v2 on 8x-SKYLAKE-UMA, which is the same as what > happens in v5. > > ---> tbench on loopback: > was down 10% in v2 on 8x-SKYLAKE-UMA, now slightly worse in v5 with a 12% > regression. As in dbench, it's at low number of clients that the results > are worst. Note that this machine is different from the one that has the > dbench regression. Clearly, playing with the pattern detection part of the governor alone is not sufficient to make all of the workloads happy at the same time. > A more detailed report follows below. > > I maintain my original opinion from v2 that this governor is largely > performance-neutral and I'm not overly worried about the numbers above: OK, fair enough. Cheers, Rafael
