On 3/14/14 8:52 PM, Zhou, Han wrote:
Tom, the point of this draft is that the "last possible point in the
stack" can
be pushed to the remote end-point of the VXLAN tunnel. If the remote
is an hypervisor, this GSO is terminated without actual work: the
receiving hypervisor simply delivers the large packet to receiving guest.
Han,
Are you saying that the sending VM and vswitch will send a large packet
(e.g., 32k) over UDP, and this will be delivered to the receiving
vSwitch and VM as one large packet? That certainly makes the work on the
VMs a lot less, hence I can understand that you see performance
improvements.
However, that would result in IP fragmentation of that large UDP/VXLAN
packet AFAICT.
The IETF has some experience with protocols where the loss unit is
smaller than the retransmission unit, and this results in very poor
performance under packet loss due to the loss of a single, small unit
resulting in the retransmission of a large unit (the 32k packet, which
might be a TCP, SCTP, etc packet i.e. a reliable protocol with
retransmissions.)
Regards,
Erik
_______________________________________________
nvo3 mailing list
[email protected]
https://www.ietf.org/mailman/listinfo/nvo3
