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

[Avi Kivity]

On 08/11/2011 12:16 PM, Daniel P. Berrange wrote:
> On Thu, Aug 11, 2011 at 11:17:09AM +0300, Avi Kivity wrote:
> >  On 08/10/2011 10:27 PM, Anthony Liguori wrote:
> >  >>This may be acceptable, wait until the entire migration cluster is
> >  >>xzbrle capable before enabling it. If not, add a monitor command.
> >  >
> >  >
> >  >1) xzbrle needs to be disabled by default.  That way management
> >  >tools don't unknowingly enable it by not passing -no-xzbrle.
> >
> >  We could hook it to -M, though it's a bit gross.
>
> That would needlessly prevent its use for any existing installed
> guests with a older machine type, which are running in a new QEMU

You could still enable it explicitly; I'm just trying to get it to be 
enabled by default.

> Some kind of monitor capabilities seems good to me.

Live migration is probably mostly done in managed environments, so I 
think you're right.

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