Re: MultiPath TCP in the Linux Kernel

Hi,

MultiPath TCP is not a port of SCTP. It is based on regular TCP and presents a 
regular socket-api to the application. Thus applications do not have to be 
modified.

MPTCP opens several TCP-subflows across it's different IP-addresses, and lets 
the data go over these different TCP sessions. To synchronize the data-
transfer MPTCP uses TCP-options. Thus, on the wire it looks like regular TCP, 
with the only difference being that there are additional TCP-options.

MPTCP increases the throughput, because it uses the TCP-subflows 
simultaneously. With our implementation we got 2Gbps throughput for a single 
iperf-session on a machine having two 1Gb-interfaces (using jumbo-frames), 
whereas regular TCP could only go up to 1Gbps, as it only uses one interface.

To maintain bottleneck-fairness the Coupled Congestion Control controls the 
congestion window of the individual subflows (included in the implementation 
since the latest release).
http://datatracker.ietf.org/doc/draft-ietf-mptcp-congestion/


Cheers,
Christoph

P.S.: We have a public webserver running MPTCP at http://mptcp.info.ucl.ac.be
So you can directly try out the power of MPTCP... ;-)

On Thursday, January 20, 2011 wrote Peter Chacko:

SCTP already provides that , and is TCP Multi-Path is going to be a port of
it or any other difference ?

We are looking to use SCTP for this feature, but as we found it it has not
kicked off , because of its firewall issues, we are trying add
Multi-Pathing at application layer, sharing all the congestion states(like
CM idea) as we are building a WAN optimized storage replication module as
part of our cloud storage gateway development.

Curious to see more info on this.

Thanks

2011/1/20 Christoph Paasch [off-list ref]

quoted

Hi all,

The IETF is developing a new transport layer solution, MultiPath TCP,
which allows to efficiently exploit several Internet paths between a
pair of hosts,
while presenting a single TCP connection to the application layer.

At the UCLouvain in Belgium we are developping the support for MultiPath
TCP
in the Linux Kernel. The implementation is a major extension to the Linux
TCP-
stack.

For general information, access:
http://inl.info.ucl.ac.be/mptcp
https://scm.info.ucl.ac.be/trac/mptcp/

To access the git-repository:
git://scm.info.ucl.ac.be/mtcp.git

branches:
       mptcp_2.6.36 - based on Linux Kernel 2.6.36
       mtcp_no_subrcvqueue - based on Linux Kernel 2.6.28

For questions, feedback,... feel free to subscribe to the mptcp-dev
Mailing-
List:
https://listes-2.sipr.ucl.ac.be/sympa/info/mptcp-dev


Regards,
Christoph

--
Christoph Paasch
PhD Student

IP Networking Lab --- http://inl.info.ucl.ac.be
MultiPath TCP in the Linux Kernel --- http://inl.info.ucl.ac.be/mptcp
Université Catholique de Louvain

www.rollerbulls.be
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--
Christoph Paasch
PhD Student

IP Networking Lab --- http://inl.info.ucl.ac.be
MultiPath TCP in the Linux Kernel --- http://inl.info.ucl.ac.be/mptcp
Université Catholique de Louvain

www.rollerbulls.be
--