I've reviewed this document as part of the transport area directorate's ongoing effort to review key IETF documents. These comments were written primarily for the transport area directors, but are copied to the document's authors for their information and to allow them to address any issues raised. The authors should consider this review together with any other last-call comments they receive. Please always CC: tsv-dir@xxxxxxxx if you reply to or forward this review. Summary: This draft is on the right track but has open issues, described in the review. Comments: This draft specifies the congestion control modifications for multi-path TCP. Major: I have one open issue - the first two goals (in the Introduction) are to have multipath TCP connections behave somewhat like single-path connections in terms of effects on (fairness to) other traffic. The algorithm specified accomplishes this solely by coupling the additive increase functionality across the flows, but allowing each flow to react to drops and congestion separately (no decrease coupling). The draft does not explain why increase coupling along is sufficient to achieve these goals or what compromise to the goals results from only coupling increases. Section 5 is a good start on this discussion, but it's not clear about what compromises to the goals results from increase coupling only. Section 5 criticizes an alternative that couples both increases and decreases for failing to achieve Goal 1, but doesn't say what this approach achieves. At most a few additional sentences in Section 5 should suffice to address this concern, and Section 2 should be edited to align with the changes to Section 5. Minor: While the [NSDI] paper is a fine place to reference work published in conferences and/or journals, RFC 3124 on the Congestion Manager is related IETF work and should be cited here as an Informative Reference. idnits 2.12.12 didn't find any nits. Thanks, --David ---------------------------------------------------- David L. Black, Distinguished Engineer EMC Corporation, 176 South St., Hopkinton, MA 01748 +1 (508) 293-7953 FAX: +1 (508) 293-7786 david.black@xxxxxxx Mobile: +1 (978) 394-7754 ---------------------------------------------------- _______________________________________________ Ietf mailing list Ietf@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf