Swapping on ZFS - stability issue

Pawel Jakub Dawidek pjd at FreeBSD.org
Sun Sep 9 00:56:30 PDT 2007

On Sat, Sep 08, 2007 at 07:08:10PM +0200, Peter Schuller wrote:
> > I'll see if I can confirm behavior on a more recent CURRENT. The above was on 
> > CURRENT:s from 1-2 months ago in both cases.
> Confirmed on CURRENT cvsup:ed today (2007-09-08). However, the speed
> at which swap was filling was much faster - on par with swap on
> non-ZFS. But the machine still effectively froze, save the
> console/ping, after a few seconds.
> Also, I forgot to say this is all on amd64 machines.

This is a known issue also in OpenSolaris. ZFS needs to allocate memory
to send I/O request, and when there is no memory, it can't allocate it
thus can't swap a process out and free it.

Pawel Jakub Dawidek                       http://www.wheel.pl
pjd at FreeBSD.org                           http://www.FreeBSD.org
FreeBSD committer                         Am I Evil? Yes, I Am!
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