Messages in this thread | | | Subject | Re: 2.6 vs 2.4 regression when running gnomemeeting | From | Christian Meder <> | Date | Sat, 20 Dec 2003 02:52:59 +0100 |
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On Sat, 2003-12-20 at 02:26, Nick Piggin wrote: > Christian Meder wrote: > > >On Sat, 2003-12-20 at 01:48, Nick Piggin wrote: > > > >>Sounds reasonable. Maybe its large interrupt or scheduling latency > >>caused somewhere else. Does disk activity alone cause a problem? > >>find / -type f | xargs cat > /dev/null > >>how about > >>dd if=/dev/zero of=./deleteme bs=1M count=256 > >> > > > >Ok. I've attached the logs from a run with a call with only an > >additional dd. The quality was almost undisturbed only very slightly > >worse than the unloaded case. > > > > OK, its probably not that then. Try the find command though, it would > be closer to what make/gcc is doing.
Ok. I've attached the find load log. Doesn't feel different from the dd disk load case. Quality is almost undisturbed.
> > > > >>You said it faired slightly better with my scheduler when renicing > >>gnome meeting to -10. How much better is that? > >> > > > >Worse than unloaded and worse than the disk loaded case from above. But > >all (CPU) loaded cases were producing almost complete audio dropouts > >while with your scheduler and renicing to -10 I got at least a > >stuttering audio stream (a regular pattern of very short slices of audio > >mixed with very short slices of silence). > > > > So it does sound like scheduling latency then. Its difficult to find > out what is happening with top and vmstat because they don't give you > an idea of individual scheduling events, which is what is important > for things like this. I'll have a look into making up a patch to gather > what I want to know.
Ok. I will try it then.
> > In the meantime, I have a newer scheduler patch against 2.6.0 you could > try: http://www.kerneltrap.org/~npiggin/v28p1.gz
Is this patch supposed to be different schedulerwise from the scheduler rollup patches against 2.6.0-testx
> Try nicing the compile to +19 if it still stutters.
Ok. I'll try it but I'm not too optimistic about the outcome ;-)
Christian Meder
-- Christian Meder, email: chris@onestepahead.de
What's the railroad to me ? I never go to see Where it ends. It fills a few hollows, And makes banks for the swallows, It sets the sand a-blowing, And the blackberries a-growing. (Henry David Thoreau)
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