patch11 - Slashdot User

Comment Re:NFS on MTCP: was :API support (Score 1) 150

by patch11 on Saturday March 23, 2013 @11:06AM (#43256861) Attached to: A 50 Gbps Connection With Multipath TCP

That is, assuming the head-of-line is send on one path and that path involves a HOL-blocking, then it doesn't matter if the other paths have lower latencies, the entire original stream will be HOL-blocked

The implementation includes a solution to overcome HOL-blocking by reinjecting the blocking data-segment on the lower-latency path. Have a look at our scientific paper, which explains this mechanism: http://inl.info.ucl.ac.be/publications/how-hard-can-it-be-designing-and-implementing-deployable-multipath-tcp

Comment Re:fault tolerance (Score 4, Informative) 150

by patch11 on Saturday March 23, 2013 @06:45AM (#43255767) Attached to: A 50 Gbps Connection With Multipath TCP

MPTCP has separate sequence-number spaces. One for the subflow, inside the regular TCP header. And the data sequence-numbers, included inside the TCP option-space.

This data sequence numbers include data-acks. So, this is your mentioned "cross-subflow ack machinery".

Submission + - A 50 Gbps TCP connection with Multipath TCP (multipath-tcp.org)

Submitted by Olivier Bonaventure on Friday March 22, 2013 @11:34AM

Olivier Bonaventure writes: The TCP protocol is closely coupled with the underlying IP protocol.
Once a TCP connection has been established through one IP address,
the other packets of the connection must be sent from this address. This
makes mobility and load balancing difficult. Multipath TCP is
a new extension that solves these old problems by decoupling TCP from
the underlying IP. A Multipath TCP connection can send packets over
several interfaces/addresses simultaneously while remaining backward
compatible with existing TCP applications. Multipath TCP has several use
cases including smartphones that can use both WiFi and 3G or servers
that can pool multiple high-speed interfaces. Christoph Paasch, Gregory
Detal and their colleagues who develop the implementation of
Multipath TCP in the Linux kernel have achieved 50 Gbps for a single TCP
connection by pooling together six 10 Gbps interfaces. See here for
technical details and full source code.

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