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From: Kevin Wolf <kwolf@redhat.com>
To: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH] qemu-iotests: mark 035 qcow2-only
Date: Fri, 25 May 2012 18:17:36 +0200	[thread overview]
Message-ID: <4FBFB0A0.5050706@redhat.com> (raw)
In-Reply-To: <1337873211-16124-1-git-send-email-stefanha@linux.vnet.ibm.com>

Am 24.05.2012 17:26, schrieb Stefan Hajnoczi:
> The 035 parallel aio write test relies on knowledge of qcow2 metadata
> layout to stress parallel L2 table accesses.  This only works for qcow2
> unless we add additional calculations for qed or other formats.
> 
> Mark this test as qcow2-only.
> 
> Note that the test is strictly speaking non-deterministic although the
> output produced is reliable with qcow2.  This is because the aio_write
> command returns before the aio write request has completed.  Completions
> can occur at any time afterwards and cause a message to be printed.
> Therefore the exact output of this test is not deterministic but we seem
> to get away with it for qcow2 (maybe due to coroutine and main loop
> scheduling).
> 
> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>

Thanks, applied to the block branch.

Kevin

      reply	other threads:[~2012-05-25 16:17 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-05-24 15:26 [Qemu-devel] [PATCH] qemu-iotests: mark 035 qcow2-only Stefan Hajnoczi
2012-05-25 16:17 ` Kevin Wolf [this message]

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