On Thu, 26 May 2005 16:20:06 -0700 (PDT)
ravinandan.arakali@neterion.com wrote:

Hi,
Attached below is a kernel patch to provide UDP LSO(Large Send Offload) 
feature.
This is the UDP counterpart of TSO. Basically, an oversized packet
(less than or equal to 65535) is handed to the NIC. The adapter then
produces IP fragments in conformance with RFC791(IPv4) or RFC2460(IPv6).

Very much like TCP TSO, UDP LSO provides significant reduction in CPU 
utilization, especially with 1500 MTU frames. For 10GbE traffic,
these extra CPU cycles translate into significant throughput increase 
on most server platforms.

Reasonable amount of testing has been done on the patch using Neterion's
10G Xframe-II adapter to ensure code stability.

Please review the patch.

Also, below is a "how-to" on changes required in network drivers to use
the UDP LSO interface.

The only downside is that it might encourage continued use of NFS over UDP.
Perhaps we need a big fat warning in NFS that says:

*** Your using NFS over UDP, your data integrity is no longer guaranteed;
*** you have been warned.