Subject: [multipathtcp] submitted draft: performance issues with MPTCP

From: Khalili Ramin <[email-masked]>
Date: Fri, 13 Jul 2012 10:12:55 +0000

Folks,

Please consider reviewing our submitted draft to the IETF:

URL:  http://www.ietf.org/internet-drafts/draft-khalili-mptcp-performance-issues-00.txt

<http://www.ietf.org/internet-drafts/draft-khalili-mptcp-performance-issues-00.txt>
Htmlized:  http://tools.ietf.org/html/draft-khalili-mptcp-performance-issues-00
<http://www.ietf.org/internet-drafts/draft-khalili-mptcp-performance-issues-00.txt>

It discusses about the performance problems we identified with current MPTCP implementation. We attribute these performance problems to the “Linked Increases” congestion control algorithm of the MPTCP.  Our results show that these problems are important and can be mitigated.

We will present this draft at the IETF meeting in Vancouver.

More results and analysis be found in our technical report:  http://infoscience.epfl.ch/record/177901

Best regards,
Ramin Khalili.

Abstract:
We show, by measurements over a testbed and by mathematical analysis, that the current MPTCP suffers from two problems: (P1) Upgrading some TCP users to MPTCP can reduce the throughput of others without any benefit to the upgraded users; and (P2) MPTCP users can be excessively aggressive towards TCP users. We attribute these problems to the "Linked Increases" Algorithm (LIA) of MPTCP [4], and more specifically, to an excessive amount of traffic transmitted over congested paths. Our results show that these problems are important and can be mitigated. We believe that the design of the congestion control of MPTCP should be improved.