[ovs-discuss] SDN networkslower than physical network

Guru Shetty guru at ovn.org
Fri Jul 6 14:37:26 UTC 2018


Since this is the same host, your 25 Gbps physical network does not come to
picture. Neither does VXLAN as both the VMs are in the same host. I would
suggest trying the following experiments.

1. Multiple sessions of netperf/iperf.
2. Sometimes, your VM's virtual NIC is the bottleneck. So if you use
para-vritualized virtual NICs, you will likely get higher throughput.
3.  I would suggest adding 2 more VMs and running multiple sessions of
netperf/iperf to see your throughput increase.

On 5 July 2018 at 23:10, Manuel Sopena Ballesteros <manuel.sb at garvan.org.au>
wrote:

> Dear OVS community,
>
>
>
> First of all, I am not sure if this is the right place for this question
> but I think it is worth to try.
>
>
>
> I installed openstack pike with ovs supporting the SDN virtual switches
> and had the impression that my SDN was not fast enough. Please see my
> configuration below:
>
>
>
> ·        Physical compute hosts connected through a 25Gbps network.
>
> ·        Each compute node has 64 cpus and 512 GB RAM.
>
>
>
> For some reason I could not get more than 10Gbps bandwidth of intra-subnet
> traffic (no routing) across 2 vms living in same physical host with VXLAN
> offload configured.
>
>
>
> I tested the network performance using iperf and iperf3 with multiple
> threads in parallel.
>
> No other vm was running in the system and the vms were only instantiated
> to run this network performance test so there were no shortage of resources
>
>
>
> Because the SDN traffic was within same compute node and same network (no
> routing involved) I am guessing that poor performance has something to do
> with OVS running in cpu but I have no clue to prove my theory. I am hoping
> someone in this email list would clarify if I am in the right direction or
> not and why.
>
>
>
> Thank you very much
>
>
>
> *Manuel Sopena Ballesteros *| Big data Engineer
> *Garvan Institute of Medical Research *
> The Kinghorn Cancer Centre, 370 Victoria Street, Darlinghurst, NSW 2010
> *T:* + 61 (0)2 9355 5760 | *F:* +61 (0)2 9295 8507 | *E:*
> manuel.sb at garvan.org.au
>
>
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