netdev - Re: [PATCH v2 net-next] inet: fix a UFO regression

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Date:	Fri, 08 Nov 2013 04:18:44 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Sridhar Samudrala <samudrala.sridhar@...il.com>
Cc:	Alexei Starovoitov <ast@...mgrid.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	Hannes Frederic Sowa <hannes@...essinduktion.org>
Subject: Re: [PATCH v2 net-next] inet: fix a UFO regression

On Thu, 2013-11-07 at 22:41 -0800, Sridhar Samudrala wrote:

> Does this fix also help vxlan performance between 2 VMs on 2 different 
> physical m/cs across 10G NIC?
> What is the throughput you are seeing via 10G nics?
> With linux 3.12, i am only seeing around 2Gbps (iperf TCP_STREAM with 
> 16K messages)  between 2 VMs when using vxlan across a 10G nic.
> Is this due to the overhead of software GSO and not doing GRO at the 
> receiver?

What NIC is used at sender, what NIC is used at receiver ?

If you use GRE instead of VXLAN, do you get any difference in speed ?


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