netdev - Re: [PATCH net-next v2 0/6] net: Add STT support.

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Date:	Thu, 29 Jan 2015 21:03:14 -0800
From:	Pravin Shelar <pshelar@...ira.com>
To:	Tom Herbert <therbert@...gle.com>
Cc:	Alexander Duyck <alexander.duyck@...il.com>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next v2 0/6] net: Add STT support.

On Thu, Jan 29, 2015 at 8:17 PM, Tom Herbert <therbert@...gle.com> wrote:
> On Thu, Jan 29, 2015 at 8:04 PM, Pravin Shelar <pshelar@...ira.com> wrote:
>> On Thu, Jan 29, 2015 at 7:46 PM, Alexander Duyck
>> <alexander.duyck@...il.com> wrote:
>>> On 01/29/2015 03:29 PM, Pravin B Shelar 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
>>>>
>>>> The protocol is documented at
>>>> http://www.ietf.org/archive/id/draft-davie-stt-06.txt
>>>>
>>>> I will send out OVS userspace patch on ovs-dev mailing list.
>>>>
>>>> Following are test results. All tests are done on net-next with
>>>> STT and VXLAN kernel device without OVS.
>>>>
>>>> Single Netperf session:
>>>> =======================
>>>> VXLAN:
>>>>     CPU utilization
>>>>      - Send local: 1.26
>>>>      - Recv remote: 8.62
>>>>     Throughput: 4.9 Gbit/sec
>>>> STT:
>>>>     CPU utilization
>>>>      - Send local: 1.01
>>>>      - Recv remote: 1.8
>>>>     Throughput: 9.45 Gbit/sec
>>>>
>>>> Five Netperf sessions:
>>>> ======================
>>>> VXLAN:
>>>>     CPU utilization
>>>>      - Send local: 9.7
>>>>      - Recv remote: 70 (varies from 60 to 80)
>>>>     Throughput: 9.05 Gbit/sec
>>>> STT:
>>>>     CPU utilization
>>>>      - Send local: 5.85
>>>>      - Recv remote: 14
>>>>     Throughput: 9.47 Gbit/sec
>>>>
>>>
>>> What does the small packet or non-TCP performance look like for STT vs
>>> VXLAN?  My concern is that STT looks like it is a one trick pony since
>>> all your numbers show is TCP TSO performance, and based on some of the
>>> comments in your patches it seems like other protocols such as UDP are
>>> going to suffer pretty badly due to things like the linearization overhead.
>>>
>>
>> Current implementation is targeted for TCP workloads thats why I
>> posted numbers with TCP, once UDP is optimized we can discuss UDP
>> numbers. I am pretty sure the STT code can be optimized further
>> specially for protocols other than TCP.
>> --
> There are many TCP workloads that use small packets, it is critical to
> test for these also. E.g. "super_netperf 200 -H <addr> -l 120 -t
> TCP_RR -- -r 1,1"
>
I have not tried it on STT device, I will collect those numbers.

> Please provide the *exact* commands that you are using to configure
> stt for optimal performance.
>
To create STT tunnel device.
`ip link add stt1  type stt key 1 remote 1.1.2.128`

No other configuration is needed.
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