Re: TCP fast retransmit

[Eric Dumazet]

Le vendredi 25 novembre 2011 Ã 10:42 +0100, Esztermann, Ansgar a Ãcrit :
> 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.
> 
I believe the RFC you gave should be the ground to your question.

Could you provide a trace showing what you believe is a violation of the
standards ?



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