Ingo Molnar wrote:
* Bill Davidsen <[email protected]> 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 <[email protected]>
CTO TMR Associates, Inc
Doing interesting things with small computers since 1979
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