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Date:      Fri, 16 Jul 2004 12:16:28 +0200
From:      "Daniel Eriksson" <daniel_k_eriksson@telia.com>
To:        "'Robert Watson'" <rwatson@freebsd.org>
Cc:        freebsd-current@freebsd.org
Subject:   RE: Native preemption is the culprit [was Re: today's CURRENTlockups]
Message-ID:  <!~!UENERkVCMDkAAQACAAAAAAAAAAAAAAAAABgAAAAAAAAA0VcX9IoJqUaXPS8MjT1PdsKAAAAQAAAAwRTrgjlFHESrKDnpN0GVQQEAAAAA@telia.com>
In-Reply-To: <Pine.NEB.3.96L.1040712153808.34546D-100000@fledge.watson.org>

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Robert Watson wrote:

> Per my earlier post, I've experienced similar unreliability.  The work
> around I'm using is to build with "#define PREEMPTION" from param.h
> disabled.  This results in a quite usable kernel, although 
> quite probably
> more poor interrupt handling latency, etc.

The server I'm running with preemption turned off becomes irresponsive and
the load average skyrockets (10+) whenever I do something as simple as
bzip2-compressing a file. Setting a nice value of 20 does not help at all.
Are you experiencing similar results on your machine?

/Daniel Eriksson




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