From: Christoph Hellwig <hch@lst.de>
To: Avi Kivity <avi@redhat.com>
Cc: Vadim Rozenfeld <vrozenfe@redhat.com>,
Dor Laor <dlaor@redhat.com>, Christoph Hellwig <hch@lst.de>,
qemu-devel <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] Re: [RFC][PATCH] performance improvement for windows guests, running on top of virtio block device
Date: Mon, 11 Jan 2010 14:47:33 +0100 [thread overview]
Message-ID: <20100111134733.GA27253@lst.de> (raw)
In-Reply-To: <4B4B2411.7030301@redhat.com>
On Mon, Jan 11, 2010 at 03:13:53PM +0200, Avi Kivity wrote:
> As Dor points out, the call to virtio_blk_handle_output() wants to be
> before the test for pending, so we scan the ring as early as possible
It could cause a race window where we add an entry to the ring after
we run virtio_blk_handle_output, but before re-enabling the
notification. But I think my variant of the patch that I just posted
should deal with this in an even better way.
next prev parent reply other threads:[~2010-01-11 13:47 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-11 7:40 [Qemu-devel] [RFC][PATCH] performance improvement for windows guests, running on top of virtio block device Vadim Rozenfeld
2010-01-11 8:30 ` [Qemu-devel] " Avi Kivity
[not found] ` <4B4AE95D.7080305@redhat.com>
2010-01-11 9:19 ` Dor Laor
2010-01-11 13:11 ` Christoph Hellwig
2010-01-11 13:13 ` Avi Kivity
2010-01-11 13:16 ` Christoph Hellwig
2010-01-11 13:47 ` Christoph Hellwig [this message]
2010-01-11 14:00 ` Anthony Liguori
2010-02-24 2:58 ` Paul Brook
2010-02-24 14:59 ` Anthony Liguori
2010-02-25 15:06 ` Paul Brook
2010-02-25 15:23 ` Anthony Liguori
2010-02-25 16:48 ` Paul Brook
2010-02-25 17:11 ` Avi Kivity
2010-02-25 17:15 ` Anthony Liguori
2010-02-25 17:33 ` Avi Kivity
2010-02-25 18:05 ` malc
2010-02-25 19:55 ` Anthony Liguori
2010-02-26 8:47 ` Avi Kivity
2010-02-26 14:36 ` Anthony Liguori
2010-02-26 15:39 ` Avi Kivity
2010-01-11 13:42 ` Christoph Hellwig
2010-01-11 13:49 ` Anthony Liguori
2010-01-11 14:29 ` Avi Kivity
2010-01-11 14:37 ` Anthony Liguori
2010-01-11 14:46 ` Avi Kivity
2010-01-11 15:13 ` Anthony Liguori
2010-01-11 15:19 ` Avi Kivity
2010-01-11 15:22 ` Anthony Liguori
2010-01-11 15:31 ` Avi Kivity
2010-01-11 15:32 ` Anthony Liguori
2010-01-11 15:35 ` Avi Kivity
2010-01-11 15:38 ` Anthony Liguori
2010-01-11 18:22 ` [Qemu-devel] " Michael S. Tsirkin
2010-01-11 18:20 ` Michael S. Tsirkin
2010-01-11 14:25 ` [Qemu-devel] " Avi Kivity
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