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Date:      Mon, 7 Mar 2005 16:05:39 -0500
From:      Brian Reichert <reichert@numachi.com>
To:        Kris Kennaway <kris@FreeBSD.org>
Cc:        freebsd-stable@freebsd.org
Subject:   Re: FreeBSD 5.3 freezes under heavy hdd load
Message-ID:  <20050307210539.GJ90757@numachi.com>
In-Reply-To: <20050307171244.GO22873@hub.freebsd.org>
References:  <1110213509.593.18.camel@p4-3200.local> <20050307171009.GA37856@e-Gitt.NET> <20050307171244.GO22873@hub.freebsd.org>

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On Mon, Mar 07, 2005 at 05:12:44PM +0000, Kris Kennaway wrote:
> It is necessary to increase KSTACK_PAGES (e.g. to 4) on machines with
> certain patterns of heavy disk write load to avoid double faults in
> the softupdates code (softupdates has potentially unbounded call stack
> and can overflow the default kernel stack size without too much
> effort).

Can these 'certain patterns' be characterized?  I've got a system
that hangs on haavy rsync usage, where the file sizes can me measured
in a half-gig or more...

> This would cause panics though, not freezes.

I can't tell remotely if all of my hangs are panics, as it's a
remote box.  Once, on the console of a hung box, I found

  panic: worklist_remove: not on list

This box did not reboot of it's own accord, and has wedged again
under a similar workload...

> Kris
> _______________________________________________
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-- 
Brian Reichert				<reichert@numachi.com>
55 Crystal Ave. #286			Daytime number: (603) 434-6842
Derry NH 03038-1725 USA			BSD admin/developer at large	



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