Re: TCP limitations (was Re: ISCSI: Urgent Flag requirement violates TCP.)

["Randall R. Stewart" <randall@stewart.chicago.il.us>]

"Bernard D. Aboba" wrote:
> 
> > Your idea makes it ALWAYS:
> >
> > Store the message in user memory where it
> > belongs, no matter what. No NIC memory would
> > ever be needed ...
> >
> >
> > Much superior...
> >
> 
> Indeed; I believe that this should be a requirement of the design.
> I'd note that the same effect can be produced with TCP by running iSCSI
> over an RDMA protocol.

Bernard:

Question for you.. I remember reading over Costa's RDMA 
proposal and it seems to me that he proposes using TCP options.
How does this interact with the use of SACK TCP? I know the
WG has discussed the need for SACK (or possibly not) and I
am just curious... will the use of a RDMA option limit you from
using SACK?

Thanks

R
-- 
Randall R. Stewart
randall@stewart.chicago.il.us or rrs@cisco.com
815-342-5222 (cell) 815-477-2127 (work)