Date: Fri, 7 Mar 2008 09:48:19 +0100
From: Jens Axboe <jens.axboe@oracle.com>
To: Anders Eriksson <aeriksson@fastmail.fm>
Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>,
       Ingo Molnar <mingo@elte.hu>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       "Rafael J. Wysocki" <rjw@sisk.pl>
Subject: Re: Linux 2.6.25-rc4
Message-ID: <20080307084818.GK17940@kernel.dk>
References: <alpine.LFD.1.00.0803042044460.12253@woody.linux-foundation.org> <200803061438.22205.bzolnier@gmail.com> <20080306133347.GA23495@elte.hu> <200803061506.19449.bzolnier@gmail.com> <20080306135532.GG17940@kernel.dk> <20080306211726.2DA8C93C881@tippex.mynet.homeunix.org>
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On Thu, Mar 06 2008, Anders Eriksson wrote:
> 
> jens.axboe@oracle.com said:
> >> I was a bit unclear on this, the problem is easily reproducible but _only_
> >> on Anders' system (I couldn't reproduce it with smartd here either).
> 
> > What IO scheduler is Anders using (and does it have an impact, eg does it
> > hang with deadline as well)? 
> 
> CONFIG_IOSCHED_NOOP=y
> CONFIG_IOSCHED_AS=y
> CONFIG_IOSCHED_DEADLINE=y
> CONFIG_IOSCHED_CFQ=y
> CONFIG_DEFAULT_IOSCHED="cfq"
> 
> On request here's a sysrq-t from smartd on -rc3, you also see exactly where 
> smartd gives up (using the gentoo default smasrtd.conf).

Can you try with noop or deadline as the default, to see if it
reproduces with them?

> Might a strace of smartd help?

Nope, looking at the trace it'll be stuck waiting for the ioctl to
finish.

-- 
Jens Axboe

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