[libvirt-users] virtio nic dosent use 10gbe speed.

[Tim Fletcher]

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On 20/02/15 11:38, Kalil de A. Carvalho wrote:
> Hello all.
> 
> We are moving from Xenserver 6.5 environment to KVM because we 
> can't use 10gbe speed in our VM's so we decided to test KVM.
> 
> To inicial test I've create script, using qemu commands, to build 
> two VM's and test the nic speed.
> 
> Each VM has one nic, using virtio, into it own bridge. In this 
> bridge we associate one 10gbe physical nic.
> 
> They can communicate each other.
> 
> When we  try do a copy, through SCP, the speed is 300mbps. And if 
> we open another copy this speed been the half.

Assuming you mean 300MB/s then I suspect you are CPU bound as that's a
lot of crypto operations for scp.

Install iperf http://pkgs.repoforge.org/iperf/

Run iperf -s on one vm and iperf -c <ip of other vm> on the second one

I have benchmarked KVM with openvswitch at over 15Gbit/s on fairly
standard hardware (Second gen i5 desktop)

- -- 
Tim Fletcher <tim at night-shade.org.uk>
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