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

[Hui Kang]

Hi, Justin
Today I have upgrade the OVS to 2.1.2 and use the vlan splinter option.
However, there is no improvement on the iperf test with vlan; the
throughput of using vlan is still half of without vlan.

During the test, I use ovs-dpctl dump-flows and observer that are
additional actions of push_vlan and pop_vlan. So I am wondering if the
performance degradation is caused by these operations.

Have anyone observer 10G performance with OVS vlan access port? Thanks.

- Hui


On Tue, Apr 29, 2014 at 5:59 PM, Justin Pettit <jpettit at nicira.com> wrote:

> 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
>
>
>
>
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