[ovs-discuss] poor performance after adding vlan tag to a vport

[Justin Pettit]

On April 29, 2014 at 2:56:49 PM, Hui Kang (hkang.sunysb at gmail.com) wrote:
> Hi, Justin,
> Thanks for your suggestions. My concern is that vlan works for my test
> cases and no packet drops with the iperf TCP test. However, the problem is
> about performance loss compared to no vlan tag is set on the vport.
>  
> Regarding vlan splinter, the FAQ says "VLAN splinters increase memory use
> and reduce performance, so use them only if needed." So I guest it will not
> improve the throughput performance.

That's mostly in there to prevent people from trying it unless they really need it.  I'd give it a try if I were you.

> Anyway, I will try a different kernel version and see if it improves.

If you're looking at upgrading parts, I'd recommend upgrading to a newer version of OVS, too.  There have been substantial improvements since 1.9.x.

--Justin