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Date:      Tue, 07 Jun 2005 08:33:22 -0700
From:      "Kevin Oberman" <oberman@es.net>
To:        "Daniel Eriksson" <daniel_k_eriksson@telia.com>
Cc:        freebsd-current@FreeBSD.org
Subject:   Re: Livelock seen on current with threaded processes 
Message-ID:  <20050607153322.208B85D07@ptavv.es.net>
In-Reply-To: Your message of "Tue, 07 Jun 2005 02:40:02 +0200." <!~!UENERkVCMDkAAQACAAAAAAAAAAAAAAAAABgAAAAAAAAA0VcX9IoJqUaXPS8MjT1PdsKAAAAQAAAAcgzDxpQAJECnrNg7KDFKNAEAAAAA@telia.com>

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> From: "Daniel Eriksson" <daniel_k_eriksson@telia.com>
> Date: Tue, 7 Jun 2005 02:40:02 +0200
> 
> Kevin Oberman wrote:
> 
> > I run transcode on a video file to convert it to divx4 using the xvid4
> > library. I do this with nice set to 10 and top confirms that it is set
> > to 10. At various times, the system starts locking up. Windows won't
> > refresh. Shell commands never execute (nor do keys echo) in 
> > some windows
> > including syscons vtys. If my gkrellm is still alive (and it usually
> > is), I see the system at 97% CPU and nothing else busy. There 
> > is a bit a
> > disk I/O but not much.
> 
> This sounds a lot like the problems I described in the thread "Serious I/O
> problems (bad performance and live-lock)" from a few weeks ago. It seems
> that when the VM subsystem is put under pressure the machine comes to a
> grinding halt. In my case I could trigger this with a simple 'dd' (on a
> filesystem, not on a raw device).

Yes, it does sound similar. I was hoping that your thread would lead to
a resolution of my problem. I can certainly believe that the problem is
VM related. Unfortunately, I believe the work-around was to set
debug.mpsafevm to 1, but that didn't seem to help at my case at all.

Am I remembering correctly?
-- 
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman@es.net			Phone: +1 510 486-8634



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