netdev - Re: [PATCH net-next 0/3] openvswitch: Add STT support.

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Date:	Wed, 21 Jan 2015 01:08:41 -0800
From:	Pravin Shelar <pshelar@...ira.com>
To:	Tom Herbert <therbert@...gle.com>
Cc:	David Miller <davem@...emloft.net>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 0/3] openvswitch: Add STT support.

On Tue, Jan 20, 2015 at 3:06 PM, Tom Herbert <therbert@...gle.com> wrote:
> On Tue, Jan 20, 2015 at 12:25 PM, Pravin B Shelar <pshelar@...ira.com> wrote:
>> Following patch series adds support for Stateless Transport
>> Tunneling protocol.
>> STT uses TCP segmentation offload available in most of NIC. On
>> packet xmit STT driver appends STT header along with TCP header
>> to the packet. For GSO packet GSO parameters are set according
>> to tunnel configuration and packet is handed over to networking
>> stack. This allows use of segmentation offload available in NICs
>>
>> Netperf unidirectional test gives ~9.4 Gbits/s performance on 10Gbit
>> NIC with 1500 byte MTU with two TCP streams.
>>
> Having packets marked TCP which really aren't TCP is a rather scary
> prospect to deploy in a real data center (TCP is kind of an important
> protocol ;-) ). Can you give some more motivation on this, more data
> that shows what the benefits are and how this compares to equivalent
> encapsulation protocols that implement GRO and GSO.
>
There are multi-year deployments of STT, So it is already in real data center.
Biggest advantage is STT does not need new NIC with tunnel offload.
Any NIC that supports TCP offload can be used to achieve better
performance.

Following are numbers you asked for.
Setup: net-next branch on server and client.
netperf: TCP unidirectional tests with 5 streams. Numbers are averaged
over 3 runs of 50 sec.

VXLAN:
CPU
  Client: 1.6
  Server: 14.2
Throughput: 5.6 Gbit/s

VXLAN with rcsum:
CPU
  Client: 0.89
  Server: 12.4
Throughput: 5.8 Gbit/s

STT:
CPU
  Client: 1.28
  Server: 4.0
Throughput: 9.5 Gbit/s

Thanks,
Pravin.
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