Date: Tue, 6 Jul 2004 13:19:26 +0200 From: Thorsten Greiner <thorsten@tgreiner.net> To: Robert Watson <rwatson@freebsd.org> Cc: current@freebsd.org Subject: Re: Native preemption is the culprit [was Re: today's CURRENT lockups] Message-ID: <20040706111926.GA1723@tybalt.nev.psi.de> In-Reply-To: <Pine.NEB.3.96L.1040706001249.2853I-100000@fledge.watson.org> References: <20040705184940.GA2651@tybalt.greiner.local> <Pine.NEB.3.96L.1040706001249.2853I-100000@fledge.watson.org>
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* Robert Watson <rwatson@freebsd.org> [2004-07-06 08:21]:
> The patch below appears to (brute force) eliminate the crash/hang I'm
> experiencing with SCHED_ULE in the post-preemption universe. However, I
> was experiencing it only in the SMP case, not UP, so it could be I'm just
> not triggering it timing-wise. This would be a temporary fix until jhb is
> online again post-USENIX to take a look, assuming this works around the
> problem for people other than me.
It does work here (as did backing out the native preemption stuff).
> Note that this is probably damaging to interrupt processing latency.
I have not observed anything unusual with this patch. There are
seemingly no increases of build times for my projects and I did not
experience any interactivity glitches (no jumpy mouse or the like).
Regards
-Thorsten
--=20
Those who in quarrels interpose, must often wipe a bloody nose.
=20
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