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Message-ID: <f6ca9fed0909271250h61e2ce94n31c9f23e835f802c@mail.gmail.com> Date: Sun, 27 Sep 2009 21:50:10 +0200 From: drago01 <drago01@...il.com> To: kernel list <linux-kernel@...r.kernel.org> Cc: mingo@...hat.com, Chuck Ebbert <cebbert@...hat.com> Subject: Re: sched regression introduced by NO_NEW_FAIR_SLEEPERS On Sun, Sep 27, 2009 at 9:47 PM, drago01 <drago01@...il.com> wrote: > Hi, > > Chuck has backported some scheduler patches from 2.6.32 to the fedora kernel. > > I did the following test to test the new scheduler (cpu is a core i7 > 920 4 cores + HT). > > run 8 "md5sum /dev/urandom" task and try to use the desktop (compiz). > > The result was that moving windows or rotating the cube is very slow. > (same happens with pure metacity but is is worse in compiz). > > Mounting debugfs and doing "echo NEW_FAIR_SLEEPERS > sched_features" > results into a useable desktop while the 8 md5sum tasks are running > (ie. the system behaves as if they where not running at all from an > interactivity pov). > > > P.S: please CC me when replying. > With "NEW_FAIR_SLEEPERS" I can even run 100(!) "md5sum" task without any effect on interactivity. (still have not found a number of tasks needed to make the system unresponsive as with 8 with "NO_NEW_FAIR_SLEEPERS". -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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