CentOS virt - Dec 2013 - 6.5 live migration speed

hello,

while upgrading a kvm virtualization cluster from c6.4 to c6.5
and i am no longer able to control the migration speed.

in c6.4 the default speed was the maximum bandwidth (1g in my case)
and the actual migration speed was about 100MB/s.

now in c6.5 the actual migration speed dropped down to about
25MB/s - 50MB/s,  it varies and sometimes during migration of
huge machines (36GB) i was at 100MB/s, but only for seconds.

i tried also to set speed using this command:

virsh migrate-setspeed <domain> --bandwidth 1000

but it seems it has no affect,  i remember in c6.3 the default
migration speed was 33% of total bandwidth and at that time
the above command worked and 100% were used during migration.

can anyone confirm this ??

thanks
ulrich

hi,

we are using bonding interfaces and the the latest kernel solved
the problem, live migration runs stable at full bandwidth.

https://rhn.redhat.com/errata/RHBA-2014-0004.html

--
ulrich

On Sat, 2013-12-28 at 11:01 +0100, Ulrich Leodolter
wrote:
> hello,
> 
> while upgrading a kvm virtualization cluster from c6.4 to c6.5
> and i am no longer able to control the migration speed.
> 
> in c6.4 the default speed was the maximum bandwidth (1g in my case)
> and the actual migration speed was about 100MB/s.
> 
> now in c6.5 the actual migration speed dropped down to about
> 25MB/s - 50MB/s,  it varies and sometimes during migration of
> huge machines (36GB) i was at 100MB/s, but only for seconds.
> 
> i tried also to set speed using this command:
> 
> virsh migrate-setspeed <domain> --bandwidth 1000
> 
> but it seems it has no affect,  i remember in c6.3 the default
> migration speed was 33% of total bandwidth and at that time
> the above command worked and 100% were used during migration.
> 
> can anyone confirm this ??
> 
> thanks
> ulrich
> 
> 
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