Re: Native preemption is the culprit [was Re: today's CURRENT lockups]

From: Gleb Smirnoff (glebius_at_cell.sick.ru)
Date: 07/06/04

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    Date: Tue, 6 Jul 2004 16:14:27 +0400
To: "Michael L. Hostbaek" <mich@FreeBSD.org>, Robert Watson <rwatson@FreeBSD.org>, Thorsten Greiner <thorsten@tgreiner.net>, Bosko Milekic <bmilekic@FreeBSD.org>, current@FreeBSD.org

    On Tue, Jul 06, 2004 at 02:12:47PM +0200, Michael L. Hostbaek wrote:
    M> > The patch below appears to (brute force) eliminate the crash/hang I'm
    M> > experiencing with SCHED_ULE in the post-preemption universe. However, I
    M> > was experiencing it only in the SMP case, not UP, so it could be I'm just
    M> > not triggering it timing-wise. This would be a temporary fix until jhb is
    M> > online again post-USENIX to take a look, assuming this works around the
    M> > problem for people other than me.
    M>
    M> I've been using this patch on my UP machine for 5-6 hours now, without
    M> any hangs/crashes.

    I have just removed #define PREEMPTION in param/machine.h and rebuilt
    kernel. No problems during working day. 

    -- 
Totus tuus, Glebius.
GLEBIUS-RIPN GLEB-RIPE
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