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Date: Fri, 25 Nov 2011 14:33:18 +0100 From: "Esztermann, Ansgar" <Ansgar.Esztermann@...-bpc.mpg.de> To: "netdev@...r.kernel.org" <netdev@...r.kernel.org> Subject: TCP fast retransmit [originally posted to lkml] Hello list, is there some documentation available on TCP fast retransmit? There seem to be quite a lot of descriptions -- from informal to scholarly papers -- on the various algorithms available to calculate the proper size of the congestion window, but I have been unable so far to find out *when* a fast retransmit is triggered. RFC 2581 states the third dupACK "should" do it, and this seems to be quoted fairly often. However, I can easily produce connections that fail to perform fast retransmit even after 5 dupACKs. Some people mention Linux uses a different (presumable more sophisticated) algorithm to trigger fast retransmits, but no-one seems to elaborate. Thanks, A. -- Ansgar Esztermann DV-Systemadministration Max-Planck-Institut für biophysikalische Chemie, Abteilung 105 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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