Messages in this thread | | | Date | Fri, 4 Jan 2002 14:39:01 +0100 | From | Andrea Arcangeli <> | Subject | Re: [announce] [patch] ultra-scalable O(1) SMP and UP scheduler |
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On Fri, Jan 04, 2002 at 03:33:19AM -0800, David Lang wrote: > On Fri, 4 Jan 2002, Ingo Molnar wrote: > > > On Fri, 4 Jan 2002, David Lang wrote: > > > > > Ingo, > > > back in the 2.4.4-2.4.5 days when we experimented with the > > > child-runs-first scheduling patch we ran into quite a few programs that > > > died or locked up due to this. (I had a couple myself and heard of others) > > > > hm, Andrea said that the only serious issue was in the sysvinit code, > > which should be fixed in any recent distro. Andrea? > > > > I remember running into problems with some user apps (not lockups, but the > apps failed) on my 2x400MHz pentium box. I specificly remember the Citrix > client hanging, but I think there were others as well.
those are broken apps that have to be fixed, they will eventually lockup even without the patch. userspace can be preempted anytime.
> I'll try and get a chance to try your patch in the next couple days. > > David Lang > > > > > try switching this back to the current behaviour and > see if the > > lockups still happen. > > > > there must be some other bug as well, the child-runs-first scheduling can > > cause lockups, but it shouldnt cause oopes. > > > > Ingo > >
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