Al Boldi wrote:
Nick Piggin wrote:
Timeslices get scaled by /proc/sys/kernel/base_timeslice. If you have bad
interactivity you could try lowering this and see if it helps.
As I am on 2.6.20, I can't really test this patch, but I tried your sched
from PlugSched and its not bad.
OK, the one in plugsched is reasonably different...
I'm getting strange numbers with chew.c, though. Try this:
Boot into /bin/sh
Run ./chew on one console.
Run ./chew on another console.
Watch latencies.
Console 1:
pid 671, prio 0, out for 799 ms, ran for 800 ms, load 50%
pid 671, prio 0, out for 799 ms, ran for 801 ms, load 50%
pid 671, prio 0, out for 799 ms, ran for 799 ms, load 49%
pid 671, prio 0, out for 800 ms, ran for 800 ms, load 49%
Console 2:
pid 672, prio 0, out for 800 ms, ran for 799 ms, load 49%
pid 672, prio 0, out for 799 ms, ran for 800 ms, load 50%
pid 672, prio 0, out for 799 ms, ran for 800 ms, load 50%
pid 672, prio 0, out for 799 ms, ran for 799 ms, load 49%
pid 672, prio 0, out for 799 ms, ran for 799 ms, load 49%
Looks good, but now add a cpu-hog, ie. while :; do :; done
Console 1:
pid 671, prio 0, out for 799 ms, ran for 399 ms, load 33%
pid 671, prio 0, out for 799 ms, ran for 399 ms, load 33%
pid 671, prio 0, out for 799 ms, ran for 399 ms, load 33%
pid 671, prio 0, out for 799 ms, ran for 399 ms, load 33%
Console 2:
pid 672, prio 0, out for 1599 ms, ran for 799 ms, load 33%
pid 672, prio 0, out for 1599 ms, ran for 799 ms, load 33%
pid 672, prio 0, out for 1599 ms, ran for 800 ms, load 33%
pid 672, prio 0, out for 1599 ms, ran for 799 ms, load 33%
It's smooth, but latencies are double on console2. Easy enough to fix,
though, just press scrollock to induce a sleep and then release.
Yeah, this issue is since fixed in v32.
Also, latencies are huge. Is there a way to fix latencies per nice?
Latencies should be quite a bit lower in v32. You can lower it
with /proc/sys/kernel/base_timeslice, however I would like to see
whether the current setting gives reasonable interactivity.
Thanks,
Nick
--
SUSE Labs, Novell Inc.
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