[ovs-discuss] TSO not working for VM iperf data packets.

[Jesse Gross]

On Fri, Dec 18, 2015 at 12:25 PM, Piyush R Srivastava1 <pirsriva at in.ibm.com>
wrote:

> Hi Jesse,
>
> Yeah that was the tcpdump for ingress port.
> Kindly find the tcpdump for egress port in namespace as well-
>
>
> [root at rhel7-23 ~]# ip netns exec
> qrouter-223d91ae-3025-4070-83d0-63faa58d819b tcpdump -ennqi qg-ab10ec1d-2b
> -c 30 host 1.1.1.34
> tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
> listening on qg-ab10ec1d-2b, link-type EN10MB (Ethernet), capture size
> 65535 bytes
>
 This has the same name as the interface as you showed before, so I'm not
sure which is right. However, I would look at each interface in the path
and try to pinpoint where TSO stops occurring. There's not much more that I
can suggest.

>
> Both the egress port of Namespace and physical NIC for external network
> (eth1) are mapped to BR-EX, however, BR-EX has 1500 MTU.
> Do you think that is affecting, even with TSO ON for eth1?
>
The MTU should not matter if TSO is set. However, TSO needs to be set on
all interfaces, not just the egress Ethernet interface.
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