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On 04/18/2017 01:11 AM, Manuel Sopena Ballesteros wrote:
> Hi all,
>
> I created 2 instances on the same compute node and tested the bandwidth between
> them, surprisingly iperf tells me I got 16.1Gbits/sec only. Then I changed the
> firewall from hybrid iptables to ovs, the bandwidth improved a little bit to
> 17.5Gbits/sec but still far from expected.

Just curious, did you constrain the two instances so they were running on the 
same NUMA node of that host?  If not you're going to hit inter-socket NUMA overhead.

Chris