Re: TCP RDMA option to accelerate NFS, CIFS, SCSI, etc.

[Aman Singla <aman@cthulhu.engr.sgi.com>]

> In this case, any network I/O running locally may well be over a different 
> protocol like UDP or ST.  (ST however, has no need for RDMA acceleration, as 
> it already has a buffer transfer design).

Thats IMO an excellent point. If you're going to have to change your
client as well as the server, and add an additional formatted header
(through the TCP RDMA option), why do you want to constraint yourself
to doing it in the context of TCP only!
Why not do it using STP? a protocol that has been designed to do
RDMAs - addressing various issues which come up when designing RDMA
s/w, firmware, h/w..
The BDS fileserver using STP does something very similar to what you're
proposing to do with NFS. There's even a prototype doing SCSI using
RDMAs of the very same kind using STP.

thanks,

:a