[e2e] Can we revive T/TCP ?

Joe Touch touch at ISI.EDU
Mon Mar 27 10:29:17 PST 2006

Hash: SHA1

Michael Welzl wrote:
>>>> If you still want congestion control, RPC over DCCP ;-))
>>> But any RPC code assumes reliable data delivery underneath?!
>> See RFC1831, sec 4:
>>    ...On the other hand, if it is running
>>    on top of an unreliable transport such as UDP [7], it must implement
>>    its own time-out, retransmission, and duplicate detection policies as
>>    the RPC protocol does not provide these services.
>> The most recent version of NFS- v4 - specs the use of RPC over both TPC
>> and UDP, and has its own locking and reordering mechanism (redundant if
>> there's just one TCP connection) - to allow it to run over multiple TPC
>> connections in parallel (to allow request pipelining while avoiding HOL
>> blocking).
> This sounds like it's duplicating SCTP functionality...

To some extent, that can be said of many protocols, since SCTP appears
to have incorporated so many ;-)

There may also be also utility to a leaner, more efficient, and simpler
to compliantly implement solution, though...

> But I have a more serious problem with this: it surely is overkill for a
> racing
> game! Is that only implemented in NFS Most Wanted, or also in the
> NFS Underground series? Never heard of a "v4", though   ;-)

Perhaps you've heard of the Network File System?

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