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Re: [Qemu-devel] question about qemu disk cache mode

From: Stefan Hajnoczi
Subject: Re: [Qemu-devel] question about qemu disk cache mode
Date: Wed, 4 Sep 2013 12:03:21 +0200
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:


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