Date: Sun, 13 Jan 2008 21:23:51 +0100 From: Kris Kennaway <kris@FreeBSD.org> To: "J.R. Oldroyd" <fbsd@opal.com> Cc: freebsd-stable@freebsd.org Subject: Re: RELENG_7 2008/01/10 desktop system also periodically freezes Message-ID: <478A7357.7010101@FreeBSD.org> In-Reply-To: <20080112134856.77585787@linwhf.opal.com> References: <1199812249.96494.133.camel@predator-ii.buffyverse> <4783C8A8.2090705@raad.tartu.ee> <4783D41B.3000204@FreeBSD.org> <4783D748.1050401@raad.tartu.ee> <4783D824.1050502@FreeBSD.org> <4783DB72.6030605@raad.tartu.ee> <4783DCAA.1080108@FreeBSD.org> <4783EA7E.1050008@raad.tartu.ee> <4783ED15.1060606@FreeBSD.org> <20080109141859.74d08743@linwhf.opal.com> <478522B5.5030101@FreeBSD.org> <20080109235819.7707133d@linwhf.opal.com> <4785C9FC.4090102@FreeBSD.org> <20080111124929.4aed2471@linwhf.opal.com> <20080112123053.164b5a5c@linwhf.opal.com> <20080112134034.75ded0b5@linwhf.opal.com> <20080112134856.77585787@linwhf.opal.com>
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J.R. Oldroyd wrote: > On Sat, 12 Jan 2008 13:40:34 -0500, I wrote: >> Ah! Just experienced a short freeze ... > > And another! This one about 3 or 4 seconds. > > The profile from the last minute is here: > http://opal.com/jr/freebsd/releng_7-freeze/200801121342-unknown.txt > > This one shows a long hold_avg (I meant hold_avg in the previous > message, too) for: > /usr/src/sys/kern/vfs_vnops.c:515 (lockmgr:ufs) > > -jr In both of these cases there is a non-mpsafe interrupt (probably your mouse) blocked on a sysctl call (both of these require Giant). That would be fixed once sysctl no longer requires Giant (hopefully before 7.1, I have a WIP), or once someone makes the psm driver mpsafe. I don't think it accounts for a multi-second pause though. Probably a sched_graph trace will also be required to diagnose that better. Kris
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