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
prev parent 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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