[lkml]   [2009]   [Sep]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: sched regression introduced by NO_NEW_FAIR_SLEEPERS
On Sun, Sep 27, 2009 at 9:47 PM, drago01 <> 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

 \ /
  Last update: 2009-09-27 21:53    [W:0.069 / U:1.900 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site