Messages in this thread | | | From | Al Boldi <> | Subject | Re: scheduler starvation resistance patches for 2.6.16 | Date | Tue, 28 Mar 2006 23:01:55 +0300 |
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Mike Galbraith wrote: > On Tue, 2006-03-28 at 07:10 +0200, Mike Galbraith wrote: > > On Mon, 2006-03-27 at 21:36 +0300, Al Boldi wrote: > > > It's not bad. w/ credit_c1/2 set to 0 results in an improvement in > > > running the MESA demos "# gears & reflect & morph3d" . > > > > Hmm. That's unexpected. > > > > > But a simple "# while :; do :; done &" (10x) makes a "# ping 10.1 -A > > > -s8" choke. > > > > Ouch, so is that. But thanks, testcases are great. I'll look into it. > > OK, this has nothing to do with my patches. The same slowdown happens > with a stock kernel when running a few pure cpu hogs. I suspect it has > to do with softirqd, but am still investigating.
I think so too.
I played with some numbers inside sched.c. Raising the MIN_TIMESLICE from 1 to between 10-100 affects interactivity positively, although it does not fix it entirely.
It does look like there is an underlying problem (locking?) that may be worked-around by tuning the scheduler to some extent.
Also, MAX_TIMESLICE = 800 seems a bit high. Can this be lowered?
Thanks!
-- Al
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