From: Jamie Lokier <jamie@shareable.org>
To: Stefan Hajnoczi <stefanha@gmail.com>
Cc: kwolf@redhat.com, g@shareable.org, qemu-devel@nongnu.org,
Alexander Graf <agraf@suse.de>,
hch@lst.de
Subject: Re: [Qemu-devel] [PATCH 0/2] Enable qemu block layer to not flush
Date: Wed, 12 May 2010 10:42:57 +0100 [thread overview]
Message-ID: <20100512094257.GA16879@shareable.org> (raw)
In-Reply-To: <AANLkTillXVFVdBLJnHDzreOEvNe264-QGdE_YBsSCwje@mail.gmail.com>
Stefan Hajnoczi wrote:
> Why add a nop AIO operation instead of setting
> BlockDriverState->enable_write_cache to zero? In that case no write
> cache would be reported to the guest (just like cache=writethrough).
Hmm. If the guest sees write cache absent, that prevents changing the
cache policy on the host later (from not flushing to flushing), which
you might want to do after an OS install has finished and booted up.
-- Jamie
next prev parent reply other threads:[~2010-05-12 9:43 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-10 21:51 [Qemu-devel] [PATCH 0/2] Enable qemu block layer to not flush Alexander Graf
2010-05-10 21:51 ` [Qemu-devel] [PATCH 1/2] Add no-op aio emulation stub Alexander Graf
2010-05-10 21:51 ` [Qemu-devel] [PATCH 2/2] Add flush=off parameter to -drive Alexander Graf
2010-05-11 8:36 ` [Qemu-devel] " Kevin Wolf
2010-05-11 10:55 ` Christoph Hellwig
2010-05-11 12:15 ` Paul Brook
2010-05-11 12:43 ` Anthony Liguori
2010-05-11 13:12 ` Paul Brook
2010-05-11 13:20 ` Anthony Liguori
2010-05-11 13:50 ` Paul Brook
2010-05-11 15:40 ` Anthony Liguori
2010-05-11 15:53 ` Paul Brook
2010-05-11 17:09 ` Anthony Liguori
2010-05-11 22:33 ` Paul Brook
2010-05-11 19:11 ` Avi Kivity
2010-05-11 16:32 ` Jamie Lokier
2010-05-11 17:15 ` Anthony Liguori
2010-05-11 18:13 ` Jamie Lokier
2010-05-11 15:18 ` Alexander Graf
2010-05-11 18:20 ` Jamie Lokier
2010-05-11 21:58 ` Paul Brook
2010-05-11 22:11 ` Paul Brook
2010-05-12 10:09 ` Jamie Lokier
2010-05-17 12:40 ` Christoph Hellwig
2010-05-14 9:16 ` Markus Armbruster
2010-05-17 12:41 ` Christoph Hellwig
2010-05-17 12:42 ` Alexander Graf
2010-05-11 19:04 ` Avi Kivity
2010-05-12 15:05 ` Alexander Graf
2010-05-12 15:36 ` Kevin Wolf
2010-05-12 15:51 ` Alexander Graf
2010-05-11 6:18 ` [Qemu-devel] [PATCH 1/2] Add no-op aio emulation stub Stefan Hajnoczi
2010-05-11 8:29 ` [Qemu-devel] " Kevin Wolf
2010-05-10 21:59 ` [Qemu-devel] [PATCH 0/2] Enable qemu block layer to not flush Anthony Liguori
2010-05-10 22:03 ` Alexander Graf
2010-05-10 22:12 ` Anthony Liguori
2010-05-11 21:48 ` Jamie Lokier
2010-05-12 8:51 ` Stefan Hajnoczi
2010-05-12 9:42 ` Jamie Lokier [this message]
2010-05-12 10:43 ` Stefan Hajnoczi
2010-05-12 12:50 ` Jamie Lokier
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