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

[Kmindg G]

On Wed, Apr 30, 2014 at 7:14 AM, Thomas F Herbert
<thomasfherbert at gmail.com> wrote:
> Hui,
>
> It also might be interesting to compare this performance with non-OVS linux
> bridging on the same kernel revision.
> Depending on the upstream kernel rev, the performance difference could have
> something to do with whether HW acceleration is used for the tag push/pop
> operations.
>
> --Tom
>
> On 4/29/2014 5:26 PM, Hui Kang wrote:
>
> Hi,
> I use iperf to test the 10G performance of OVS bridge with vlan tag added on
> the vport for the VMs.

What's the packets that iperf send?  tcp?
Give that packets're tagged, is there any chance that it's related with mtu?

>
> On each machine, the OVS bridge are created on the Intel 82599 10G NIC. I
> found the performance drops  significantly when I added vlan tag on the
> vport of both VMs.
>
> no vlan tag:   9.47 Gbps
> add vlan tag: 3.96 Gbps
>
> Is this a normal behavior after adding vlan tag to the packet header?
> Thanks.
>
> - Hui Kang
>
>
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