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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? > Doing this slows down the display rates, but doesn't significantly help the smoothness of the gears. > 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. > I didn't test this with standard Xorg priority, I should go back and try that. But it didn't really make much difference. The gears and scrolling xterms ran slower with Xorg at -20 with any sched settings. I'll do that as soon as a build finishes and I can reboot. I should really go back to 2.6.21.6, 2.6.22 has many bizarre behaviors with FC6. Automount starts taking 30% of CPU (unused at the moment), the sensors applet doesn't work, etc. I hope over the weekend I can get bug reports out on all this, but there are lots of non-critical oddities. > Ingo -- Bill Davidsen <davidsen@tmr.com> "We have more to fear from the bungling of the incompetent than from the machinations of the wicked." - from Slashdot - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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