Date: Mon, 7 Mar 2005 21:28:25 +0000 From: Kris Kennaway <kris@FreeBSD.org> To: Brian Reichert <reichert@numachi.com> Cc: freebsd-stable@freebsd.org Subject: Re: FreeBSD 5.3 freezes under heavy hdd load Message-ID: <20050307212825.GB34940@hub.freebsd.org> In-Reply-To: <20050307210539.GJ90757@numachi.com> References: <1110213509.593.18.camel@p4-3200.local> <20050307171009.GA37856@e-Gitt.NET> <20050307171244.GO22873@hub.freebsd.org> <20050307210539.GJ90757@numachi.com>
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On Mon, Mar 07, 2005 at 04:05:39PM -0500, Brian Reichert wrote: > 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? Probably combinations of lots of writes and removes of directories. > 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... That's probably different - as I said, the problem I'm talking about causes double faults. Kris
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