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    SubjectRe: [announce] [patch] ultra-scalable O(1) SMP and UP scheduler
    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
    > >


    Andrea
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