Re: Poor performance with qemu

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On Thu, Apr 08, 2010 at 06:28:54PM +0300, Avi Kivity wrote:
> When it updates qcow2 metadata or when the guest issues a barrier.  It's  
> relatively new.  I have a patch that introduces cache=volatile somewhere.

qcow2 does not issues any fsyncs by itself, it only passes throught the
guests ones.  The only other placess issueing fsyncs is commit a COW
image back to the base image, and on migreation.

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