Agree here too. STT is optimized for when both ends are x86 (although
one of those ends could certainly be used as a gateway).
On 8/29/12 5:29 PM, Somesh Gupta wrote:
Agree although some of the NICs can do some or most of the offloads
even today.
But in my opinion STT introduces reassembly state in the receiver
which would
prevent gateway implementations in ASICs -- for a short term gain.
*From:*Jon Hudson [mailto:[email protected]]
*Sent:* Wednesday, August 29, 2012 5:26 PM
*To:* Somesh Gupta
*Cc:* [email protected]
*Subject:* Re: [nvo3] performance limitations with virtual switch as
the nvo3 end point
Totally agreed, but that will require all new hardware.
One of the gains of STT was the use of current off the self
performance capabilities.
On Wed, Aug 29, 2012 at 5:19 PM, Somesh Gupta <[email protected]
<mailto:[email protected]>> wrote:
I assume that majority of the NIC vendors will support the stateless
offloads for
VxLAN and NvGRE by sometime next year -- so they should all be on
equal footing
from that point of view.
the additional overhead of encap/decap compared to the overhead of
copying date between
the VM and the hypervisor should be minimal.
*From:*[email protected] <mailto:[email protected]>
[mailto:[email protected] <mailto:[email protected]>] *On
Behalf Of *smith, erik
*Sent:* Wednesday, August 29, 2012 3:48 PM
*To:* David LE GOFF; [email protected] <mailto:[email protected]>
*Subject:* Re: [nvo3] performance limitations with virtual switch as
the nvo3 end point
Hi David, a few months ago we did some basic performance testing with
OVS and were pretty happy with the results. For one reason or another
we were under the impression that using OVS to encap/decap would limit
our total throughput to 4-6 Gbps and this turned out to not be the
case. In our configuration, we were able to demonstrate 20 Gbps over
a bonded pair of 10GbE NICs using STT for the overlay. Our testing
wasn't exactly scientific but I also found an interesting blog post by
Martin Cassado that our limited testing seems to corroborate.
I haven't done any testing with VMware and VXLAN. However, if you're
experiencing limited performance with OVS on <insert your favorite
Linux distro here>, I would suggest playing around with Jumbo frames
(starting from within the guest) and working your way out to the
physical interfaces.
For additional information, refer to the following:
1)Martin Cassado's blog: (
http://networkheresy.com/2012/06/08/the-overhead-of-software-tunneling/ )
2)I posted something to my blog a bit less detailed (but with
diagrams) earlier this week (
http://brasstacksblog.typepad.com/brass-tacks/2012/08/network-virtualization-networkings-21st-century-equivalent-to-the-space-race.html
) Specifically, the final three diagrams..
Erik
*From:*[email protected] <mailto:[email protected]>
[mailto:[email protected] <mailto:[email protected]>] *On
Behalf Of *David LE GOFF
*Sent:* Wednesday, August 29, 2012 9:16 AM
*To:* [email protected] <mailto:[email protected]>
*Subject:* [nvo3] performance limitations with virtual switch as the
nvo3 end point
Hi Folks,
Did anyone experienced some performance limitations in Labs with the
virtual switch function as the bottleneck when dealing with network
overlays?
I mean with the tunnel end point located on the hypervisor (virtual
switch), setting up Tagging, QoS, ACL, encryption/decryption, etc.
require significant CPUs.
I know there is not yet official nvo3 implementation there, though
VSphere 5 announced it with VXLAN recently but at any chance if some
studies have been done, I would be glad to read those.
I know STT has been built to overcome such challenges thanks to the
NIC offload capabilities...
These studies may also drive the brainstorming about which protocol we
may use/build?
Thank you!
david le goff.
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