[pve-devel] adding live migration options ? (xbzlre, compression, ...)

Alexandre DERUMIER aderumier at odiso.com
Thu Sep 24 09:43:06 CEST 2015


>>I think those are special cases, and it is always better to enable compression, 
>>because 
>>it reduces traffic on the network.

the kvm forum slides, they said that with compression, the migration is slower 
on 10gbit network.


>>But do we already use lz4? 
Currently we don't have implemented live migration compress. (it's a new feature from qemu 2.4)


I'll make a basic patch to enable compression, and will do some benchmark with 10gbe network.


----- Mail original -----
De: "dietmar" <dietmar at proxmox.com>
À: "aderumier" <aderumier at odiso.com>
Cc: "pve-devel" <pve-devel at pve.proxmox.com>
Envoyé: Mercredi 23 Septembre 2015 17:47:35
Objet: Re: [pve-devel] adding live migration options ? (xbzlre, compression, ...)

> for xbzrle, I think we could enable it by default, as it's has been optimized 
> since this commit: 
> http://git.qemu.org/?p=qemu.git;a=commit;h=27af7d6ea5015e5ef1f7985eab94a8a218267a2b 
> 
> 
> for compression, slides said that for 10GBE, it's slower with compression. 
> also for compression, we can configure number of threads and compression level 
> 
> http://git.qemu.org/?p=qemu.git;a=blob;f=docs/multi-thread-compression.txt 

I think those are special cases, and it is always better to enable compression, 
because 
it reduces traffic on the network. But do we already use lz4? 


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