From: Jeff Moyer <jmoyer@redhat.com>
To: Doug Neal <dneallkml@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: I/O scheduler deadlocks on Xen virtual block devices
Date: Thu, 02 Sep 2010 09:47:02 -0400 [thread overview]
Message-ID: <x49bp8gfeax.fsf@segfault.boston.devel.redhat.com> (raw)
In-Reply-To: <AANLkTikGYEuCE2-TaKwANwoCFEjVNL4KZa1AhJ2woGud@mail.gmail.com> (Doug Neal's message of "Thu, 2 Sep 2010 09:34:59 +0100")
Doug Neal <dneallkml@gmail.com> writes:
>>
>> Did you try these different I/O schedulers in the domU or on the dom0?
>> Does switching I/O schedulers in either place make the problem go away
>> when it happens?
>>
>
> In the domU, and the bug was present in all cases. The dom0 was using
> cfq. I'll run the tests again using each scheduler in the dom0 with
> domU set to noop and report back.
While I think this is an interesting test, you need only test one I/O
scheduler in the dom0. Also, I think you misunderstood the second
question. I'd like to know if switching I/O schedulers while the system
is in this bad state helps get I/O going again.
Cheers,
Jeff
next prev parent reply other threads:[~2010-09-02 13:49 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-01 14:17 Doug Neal
2010-09-01 17:33 ` Jeff Moyer
2010-09-02 8:34 ` Doug Neal
2010-09-02 13:47 ` Jeff Moyer [this message]
2010-09-02 14:06 ` Doug Neal
2010-09-02 15:25 ` Jeff Moyer
2010-09-02 15:43 ` Doug Neal
2010-09-03 12:22 ` Pasi Kärkkäinen
2010-09-03 15:17 ` Jeremy Fitzhardinge
2010-09-06 12:44 ` Doug Neal
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