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

[Avi Kivity]

On 08/08/2011 04:29 PM, Anthony Liguori wrote:
> One thing that strikes me about this algorithm is that it's very good 
> for a particular type of workload--shockingly good really.

Poking bytes at random places in memory is fairly generic.  If you have 
a lot of small objects, and modify a subset of them, this is the pattern 
you get.

> I think workload aware migration compression is possible for a lot of 
> different types of workloads.  That makes me a bit wary of QEMU 
> growing quite a lot of compression mechanisms.
>
> It makes me think that this logic may really belong at a higher level 
> where more information is known about the workload.  For instance, I 
> can imagine XBZRLE living in something like libvirt.

A better model would be plugin based.

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