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

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Message-ID: <527D478E.4020607@gmail.com>
Date:	Fri, 08 Nov 2013 12:20:30 -0800
From:	Sridhar Samudrala <samudrala.sridhar@...il.com>
To:	Eric Dumazet <eric.dumazet@...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 11/8/2013 4:18 AM, Eric Dumazet wrote:
> 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 ?
I am seeing almost similar results with both Emulex and Intel 10Gb NICs 
at both sender and receiver.
>
> If you use GRE instead of VXLAN, do you get any difference in speed ?
With GRE, i am seeing slightly better results. 3.2Gb/s compared to 
1.8Gb/s with vxlan.


Thanks
Sridhar
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