Messages in this thread | | | Date | Thu, 12 Jul 2007 08:41:23 -0400 | From | Bill Davidsen <> | Subject | Re: [patch] CFS scheduler, -v19 |
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Ingo Molnar wrote: > * Bill Davidsen <davidsen@tmr.com> wrote: > > >>> I've taken mainline git tree (freshly integrated CFS!) out for a >>> multimedia spin. I tested watching movies and listenign to music in >>> the presence of various sleep/burn loads, pure burn loads, and mixed >>> loads. All was peachy here.. I saw no frame drops or sound skips or >>> other artifacts under any load where the processor could possibly >>> meet demand. >>> >> I would agree with preliminary testing, save that if you get a lot of >> processes updating the screen at once, there seems to be a notable >> case of processes getting no CPU for 100-300ms, followed by a lot of >> CPU. >> >> I see this clearly with the "glitch1" test with four scrolling xterms >> and glxgears, but also watching videos with little busy processes on >> the screen. The only version where I never see this in test or with >> real use is cfs-v13. >> > > just as a test, does this go away if you: > > renice -20 pidof `Xorg` > > i.e. is this connected to the way X is scheduled? > > Partial answer: -10 didn't help with v16, I'll try more boost ASAP, but power has been spotty in upstate NY, 20k+ customers with none and the rest of us subject to "load shedding" with zero warning, and the test machines have UPS but no generator, so I hesitate to use them while power is unstable. > Another thing to check would be whether it goes away if you set the > granularity to some really finegrained value: > > echo 0 > /proc/sys/kernel/sched_wakeup_granularity_ns > echo 500000 > /proc/sys/kernel/sched_granularity_ns > > this really pushes things - but it tests the theory whether this is > related to granularity. >
Will do, you suggested dropping sched_granularity_ns to 1000000 earlier, and that didn't do it, but I didn't change the wakeup, and will test these values later today.
-- bill davidsen <davidsen@tmr.com> CTO TMR Associates, Inc Doing interesting things with small computers since 1979
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