[ovs-discuss] Physical interface vs interface under OVS bridge Performance/throughput impact

Ben Pfaff blp at ovn.org
Thu Nov 15 14:48:43 UTC 2018


On Wed, Nov 14, 2018 at 05:54:52PM +0000, Srinivas via discuss wrote:
> Hello all,Lets say i have a physical interface eth0 that i move under
> a ovs-bridge br0.
> a) What would the performance / throughput impact as a result of the
> physical interface being part of the ovs bridge now?The reason i ask
> is there is probably a extra hop the packet will have to take now to
> go  from the physical interface through the ovs stack before it
> reaches the ip on the bridge now.

There is definitely an extra hop and extra cost.  The difference is
usually minimal.

> b ) Would this performance impact be more if i run ovs as a plain L2
> learning switch i.e no openflow rules configured.

No.  (Why would running OVS in the simplest way increase the performance
cost?)


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