slow performance live migration

Oct 3, 2021
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good afternoon,

I have a proxmox version 7 cluster. In the cluster are 3 machines with 10GB interfaces. I have a question about live migration performance

1st Doubt, when I do live migration from one host to another, not all the available resources are used. Reading the documentation, I saw that proxmox uses xbzrle to do this process, and reading its documentation I saw that it uses a compression cache that is equivalent to 10% of the RAM of the virtual machine.

Is it possible to improve this?

Performing tests with iperf3 I can reach 10GB of bandwidth without any problem, however in the live migration, the performance is very low.
 

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