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

[Jeff Chase <chase@cs.duke.edu>]

"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.


This may be true, but of course implementing RDMA over TCP faces the
same basic problem of framing.  That is why some of the same solutions
(TCP option, urgent pointer, etc.) have been proposed in conjunction
with
TCP RDMA, independent of iSCSI.  It seems clear that this thread is
equally relevant to the TCP RDMA question.

Jeff