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Multipath TCP: an overviewMultipath TCP: an overviewPosted Mar 27, 2013 9:03 UTC (Wed) by christophpaasch (subscriber, #54567)In reply to: Multipath TCP: an overview by gylle Parent article: Multipath TCP: an overview
If the paths have different delays (e.g., WiFi vs. 3G), the Head-of-line blocking is "fixed" by reinjecting the blocking segment on the faster subflow.
You can have a look at the scientific paper, which describes this mechanism:
(Section 4.2)
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Multipath TCP: an overview Posted Mar 27, 2013 11:46 UTC (Wed) by gylle (subscriber, #15057) [Link]
Thanks! That was what I was looking for. Quite a costly fix though.
Multipath TCP: an overview Posted Mar 27, 2013 12:43 UTC (Wed) by christophpaasch (subscriber, #54567) [Link]
Costly, in terms of what?
Because we reinject the data on another subflow and thus use its bandwidth?
Multipath TCP: an overview Posted Mar 27, 2013 12:45 UTC (Wed) by christophpaasch (subscriber, #54567) [Link]
Actually, I agree that the stack should reinject as few packets as possible to prevent wasting bandwidth.
But there won't ever be more than one reinjection per RTT of the fast subflow.
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