[zeromq-dev] Data Centre TCP

Steven McCoy steven.mccoy at miru.hk
Sat Jun 11 20:09:59 CEST 2011

Interesting read,

*DCTCP is an enhancement to the TCP congestion control algorithm for data
> center networks. It leverages Explicit Congestion Notification (ECN), a
> feature which is increasingly becoming available in modern data center
> switches. DCTCP sources extract multi-bit feedback on congestion from the
> single-bit stream of ECN marks by estimating the fraction of marked packets.
> In doing so, DCTCP sources react to the extent of congestion, not just
> the presenceof congestion as in TCP.  This finer level of control allows
> DCTCP to operate with very low buffer occupancies while simultaneously
> achieving high throughput. *


I've looked to using ECN for PGM but the congestion control algorithms for
PGM, predominantly PGMCC are theoretically better.  However in
implementation PGMCC is dead at high speed and so ECN might be more
practical for high speed networks.

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