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Re: [Qemu-discuss] [Qemu-devel] question about qemu disk cache mode
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From: |
Stefan Hajnoczi |
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Subject: |
Re: [Qemu-discuss] [Qemu-devel] question about qemu disk cache mode |
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Date: |
Wed, 4 Sep 2013 12:03:21 +0200 |
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User-agent: |
Mutt/1.5.21 (2010-09-15) |
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