Moving past TCP in the data center, part 1

Posted Nov 2, 2022 9:39 UTC (Wed) by joib (subscriber, #8541)
In reply to: Moving past TCP in the data center, part 1 by neilbrown
Parent article: Moving past TCP in the data center, part 1

From https://web.stanford.edu/~ouster/cgi-bin/papers/replaceTc... (which I guess is the paper this presentation is based on), section 6 deals with Infiniband.

> However, RDMA shares most of TCP’s problems. It is
> based on streams and connections (RDMA also offers unre-
> liable datagrams, but these have problems similar to those for
> UDP). It requires in-order packet delivery. Its congestion con-
> trol mechanism, based on priority flow control (PFC), is dif-
> ferent from TCP’s, but it is also problematic. And, it does not
> implement an SRPT priority mechanism.