From: Stefan Hajnoczi <stefanha@gmail.com>
To: xuanmao_001 <xuanmao_001@163.com>
Cc: Kevin Wolf <kwolf@redhat.com>, qemu-devel <qemu-devel@nongnu.org>,
qemu-discuss <qemu-discuss@nongnu.org>
Subject: Re: [Qemu-devel] question about qemu disk cache mode
Date: Wed, 4 Sep 2013 12:03:21 +0200 [thread overview]
Message-ID: <20130904100321.GE9654@stefanha-thinkpad.redhat.com> (raw)
In-Reply-To: <2013090411470490667813@163.com>
On Wed, Sep 04, 2013 at 11:47:04AM +0800, xuanmao_001 wrote:
> my qemu-kvm version is 1.0.1
> I would like to figure out the qemu disk cache mode. I have visited the qemu-options.hx
> there is two cache that I didn't understand: the host cache page and the qemu disk write cache.
>
> Is "host page cache" only used for read. and "qemu disk write cache" used for writing.
>
> which cache the data reached first? host page cache or qemu disk write cache?
The following slides might be helpful in explaining the caching modes:
https://events.linuxfoundation.org/slides/2011/linuxcon-japan/lcj2011_hajnoczi.pdf
Stefan
prev parent reply other threads:[~2013-09-04 10:03 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-04 3:47 [Qemu-devel] question about qemu disk cache mode xuanmao_001
2013-09-04 8:00 ` Kevin Wolf
2013-09-04 9:07 ` xuanmao_001
2013-09-04 9:45 ` Kevin Wolf
2013-09-04 10:18 ` xuanmao_001
2013-09-04 10:03 ` Stefan Hajnoczi [this message]
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