VM migration use small amount of available bandwidth

Hello,

We have RHEV on 10Gbps network infrastructure. Usually network transfers run cca 800-1000 MB/s, but when I migrate VM from one hypervisor to another, network usage is about 50-70 MB/s only...

I tried to set migration_max_bandwidth = 500 in vdsm.conf, but IMHO VDSM ignores this value...

Do you have any idea to speed up live migration on RHEV 3.2? Why is VM live migration too slow?

Thanks,
Milan