Messages in this thread | | | Subject | Re: [PATCH] 2.5.72 O(1) interactivity bugfix | From | Andreas Boman <> | Date | 18 Jun 2003 13:59:54 -0400 |
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On Wed, 2003-06-18 at 10:43, Con Kolivas wrote: > --BEGIN PGP SIGNED MESSAGE-- > Hash: SHA1 > > Hi Ingo, all > > While messing with the interactivity code I found what appears to be an > uninitialised variable (p->sleep_avg), which is responsible for all the > boost/penalty in the scheduler. Initialising this variable to 0 seems to have > made absolutely massive improvements to system responsiveness under load > and completely removed audio skips up to doing a make -j64 on my uniprocessor > P4 (beyond which swap starts being used), without changing the scheduler > timeslices. This seems to help all 2.4 O(1) based kernels as well. Attached > is a patch against 2.5.72 but I'm not sure about the best place to initialise > it.
Applying this ontop of 2.5.72-mm1 causes more xmms/mpg321/ogg123 skipping than with plain -mm1 here. make -j20 on my up athlon 1900+ with 512M ram causes extreme skipping until the make is killed. With plain -mm1 I may get _one_ skip at the very begining of a song during make -j20 (about 50% of the time). Plain -mm1 stops skipping after 10-15 sec of playback of a song, and even switching desktops after that doesnt cause skips, with or without make -j20 running (switching to/from desktops with apps like mozilla, evolution etc. will cause skips during the first 10-15 sec of a song regardless what I do it seems).
Renicing xmms to -15 doesnt change anything with either kernel.
Andreas
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