Re: [Qemu-devel] [libvirt] [PATCH v4] XBZRLE delta for live migration of large memory apps

[Avi Kivity]

On 08/08/2011 05:04 PM, Daniel P. Berrange wrote:
> My main concern with all these scenarios where libvirt touches the
> actual data stream though is that we're introducing extra data copies
> into the migration path which potentially waste CPU cycles.
> If QEMU can directly XBZRLE encode data into the FD passed via 'fd:'
> then we minimize data copies. Whether this is a big enough benefit
> to offset the burden of having to maintain various compression code
> options in QEMU I can't answer.

It's counterproductive to force an unneeded data copy in order to 
increase bandwidth.

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