FreeBSD 5.3 freezes under heavy hdd load
kris at FreeBSD.org
Mon Mar 7 13:28:25 PST 2005
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.
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