Date: Tue, 9 Mar 2010 21:53:55 +1100 From: Peter Jeremy <peterjeremy@acm.org> To: Stefan Bethke <stb@lassitu.de> Cc: FreeBSD Stable <freebsd-stable@freebsd.org> Subject: Re: Many processes stuck in zfs Message-ID: <20100309105355.GD3978@server.vk2pj.dyndns.org> In-Reply-To: <864468D4-DCE9-493B-9280-00E5FAB2A05C@lassitu.de> References: <864468D4-DCE9-493B-9280-00E5FAB2A05C@lassitu.de>
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[-- Attachment #1 --] On 2010-Mar-09 10:15:53 +0100, Stefan Bethke <stb@lassitu.de> wrote: >Over the past couple of months, I've more or less regularly observed machines having more and more processes stuck in the zfs wchan. The processes never recover from that, How long have you waited? There seems to be a problem with low free memory handling that causes ZFS to turn into cold molasses. The work-around is to run a program that allocates a decent size chunk of memory and then exits. The original suggestion was something like: perl -e '@x = (0) x 1000000;' I've written a short program that allocates and dirties ~100MB and then exits and run it from cron. -- Peter Jeremy [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.14 (FreeBSD) iEYEARECAAYFAkuWKMMACgkQ/opHv/APuIfMnACfXdRRLq7lnwMLvxpAIXxBySj/ QtgAmwUTQ5iSzx0QuxXcjq3kT0VKn8fb =L+vJ -----END PGP SIGNATURE-----
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