Date: Sun, 13 Jan 2008 23:51:56 -0500 From: "J.R. Oldroyd" <fbsd@opal.com> To: freebsd-stable@freebsd.org, Kris Kennaway <kris@freebsd.org>, sam@errno.com Subject: Re: RELENG_7 2008/01/10 desktop system also periodically freezes Message-ID: <20080113235156.203a9976@linwhf.opal.com> In-Reply-To: <20080113172524.081f0abb@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> <op.t4v0nket8527sy@guido.klop.ws> <20080113172524.081f0abb@linwhf.opal.com>
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Well, after running the ktr_sched-enabled kernel for about 4h50 now, I
did just see a short freeze. Abt 2-3 seconds. And I got a ktr dump
right after it came back. It can be downloaded here (I guess rt-click
and save the link):
http://opal.com/jr/freebsd/releng_7-freeze/200801132250-ktr.out
When I run schedgraph, all it shows for the whole period is just:
CPU 0
irq 17: pcm0 ath0
ath0 taskq
that's it. I have a shared irq between ath and the sound. Funnily
enough, within a few mins before the freeze, I was just listening
to a voicemail (i.e., I ran mplayer on a .wav file), but that was done
easily a minute or more before the freeze. I tried repeating that,
listening to the file and waiting a bit, but no more freezes. So not
sure if this is a possible indication of the cause, or not. It's
annoying not to be able to find a way of triggering this problem on
demand, though.
Anyway, I looked at the other system where I've had long freezes.
It has a shared [irq9: pcm0 cbb0++*] and on cbb0 I have an ath card!
So there, too, is an irq shared between pcm and ath. On this system,
if I find I'm in a long freeze and don't want to be, I've found that
pulling the ath card causes an immediate un-freeze.
Admittedly, based on the recent days' discussion in this thread, I
was more expecting to see moused or powerd or an xorg problem.
Oh! Another freeze, right then! This dump shows pcm0/ath0 too, but
also a bit more activity just after the return.
http://opal.com/jr/freebsd/releng_7-freeze/200801132337-ktr.out
This time I was not listening to sound. I was typing this email.
Wasn't there a thread about shared irqs here (or maybe on current)
recently?
-jr
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