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

Alexandre DERUMIER aderumier at odiso.com
Wed Sep 23 17:30:17 CEST 2015


>>For example, why do you want to disable compression or 
>>xbzrle? Any benchmarks? 

here some news for kvm forum 2015 :)

http://www.linux-kvm.org/images/b/b3/02x-09-Cedar-Liang_Li-KVMLiveMigrationOptimization.pdf


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



(BTW, they are a lot of interesting doc for different topic from kvm forum 2015, http://www.linux-kvm.org/page/KVM_Forum_2015)



----- Mail original -----
De: "dietmar" <dietmar at proxmox.com>
À: "aderumier" <aderumier at odiso.com>, "pve-devel" <pve-devel at pve.proxmox.com>
Envoyé: Mercredi 23 Septembre 2015 16:50:36
Objet: Re: [pve-devel] adding live migration options ? (xbzlre, compression, ...)

> I wonder if it could be great to add an option to manage 
> live migration features (xbzrle,compression (qemu 2.4), ). 
> As no everybody as same workload or bandwith. 
> 
> Maybe in datacenter.cfg ? or vmid.conf ? 
> 
> 
> What do you think about it ? 

If we add additional options, there should be a good reason. 
For example, why do you want to disable compression or 
xbzrle? Any benchmarks? 


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