Re: [Tofoo] FW: I-D Action: draft-zhou-li-vxlan-soe-01.txt

Tom Herbert <therbert@google.com> Tue, 20 May 2014 18:44 UTC

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Date: Tue, 20 May 2014 11:43:58 -0700
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From: Tom Herbert <therbert@google.com>
To: "Zhou, Han" <hzhou8@ebay.com>
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Subject: Re: [Tofoo] FW: I-D Action: draft-zhou-li-vxlan-soe-01.txt
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Hi Zou, a couple of questions inline.


On Mon, May 19, 2014 at 8:01 PM, Zhou, Han <hzhou8@ebay.com> wrote:

> Hi,
>
> We have updated the VXLAN-SOE draft according to earlier comments. Now it
> is fully compatible with VXLAN-GPE. And some examples are added for better
> understanding


>
A prototype is also implemented here (patch based on Open vSwitch):
>
> https://github.com/hzhou8/openvswitch/commit/9a7deb8b432ce83a9c09d7d4ff85fa050f7dd2be
>
> netperf TCP_STREAM test result between a pairs of VMs on hosts with 10G
> interfaces:
>
> Before the change: 2.62 Gbits/sec
> After the change: 6.68 Gbits/sec
> Speedup is ~250%.
>
> Can you provide some more details on this benefit? It seems like plain
TSO/LRO that understands encapsulation should provide similar benefits when
going between hosts.

The patch attracted some interests in OVS community, but since this RFC
> draft is in very early stage so it is regarded as inappropriate by Jesse to
> apply the change to OVS tree.
> The discuss mail-thread:
> http://openvswitch.org/pipermail/discuss/2014-May/013981.html
> http://openvswitch.org/pipermail/discuss/2014-May/013898.html
>
> So we would like to request a review here by NVO3/TOFOO groups and VXLAN
> authors: is this VXLAN extension is worth formally put into VXLAN as a
> standard, so that more people can benefit from it?
>
> Could you get the same effect by setting larger MTUs on the overlay
network interface and relying in path MTU discovery when going over
physical network?


> Best regards,
> Han
>
> -----Original Message-----
> From: I-D-Announce [mailto:i-d-announce-bounces@ietf.org] On Behalf Of
> internet-drafts@ietf.org
> Sent: Friday, May 02, 2014 8:09 PM
> To: i-d-announce@ietf.org
> Subject: I-D Action: draft-zhou-li-vxlan-soe-01.txt
>
>
> A New Internet-Draft is available from the on-line Internet-Drafts
> directories.
>
>
>         Title           : Segmentation Offloading Extension for VXLAN
>         Authors         : Han Zhou
>                           Chengyuan Li
>         Filename        : draft-zhou-li-vxlan-soe-01.txt
>         Pages           : 13
>         Date            : 2014-05-02
>
> Abstract:
>    Segmentation offloading is nowadays common in network stack
>    implementation and well supported by para-virtualized network device
>    drivers for virtual machine (VM)s. This draft describes an extension
>    to Virtual eXtensible Local Area Network (VXLAN) so that segmentation
>    can be decoupled from physical/underlay networks and offloaded
>    further to the remote end-point thus improving data-plane performance
>    for VMs running on top of overlay networks.
>
>
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-zhou-li-vxlan-soe/
>
> There's also a htmlized version available at:
> http://tools.ietf.org/html/draft-zhou-li-vxlan-soe-01
>
> A diff from the previous version is available at:
> http://www.ietf.org/rfcdiff?url2=draft-zhou-li-vxlan-soe-01
>
>
> Please note that it may take a couple of minutes from the time of
> submission
> until the htmlized version and diff are available at tools.ietf.org.
>
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>
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