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Re: [Xen-devel] Re: [Qemu-devel] [PATCH] qemu and qemu-xen: support empt

from [Christoph Hellwig] [Permanent Link][Original]
To: Kevin Wolf <kwolf@xxxxxxxxxx>
Subject: Re: [Xen-devel] Re: [Qemu-devel] [PATCH] qemu and qemu-xen: support empty write barriers in xen_disk
From: Christoph Hellwig <hch@xxxxxx>
Date: Fri, 26 Nov 2010 14:29:59 +0100
Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Christoph Hellwig <hch@xxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>, qemu-devel@xxxxxxxxxx
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On Fri, Nov 26, 2010 at 12:03:35PM +0100, Kevin Wolf wrote:
> I don't think the synchronous flushes even do what they're supposed to
> do. Shouldn't ioreq->postsync do the flush after the request has
> completed instead of doing it as soon as it has been submitted?

Indeed, that's yet another bug in the implementation.


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