On 10 Jun 2010, at 00:53, Scheffenegger, Richard wrote:
> Further, I have spent some time looking for research on the
> effectiveness of SACK - as this option would reduce the typical number
> of SACK fields from a maximum of 3 down to 2. But from what I learned,
> it seems that the number of SACK fields in an ACK have the property of
> diminishing returns. You gain a lot from the 1st field; somewhat from
> the 2nd, a bit from the 3rd, and having a 4th is surplus :).
That's probably because TCP's dupack threshold is three, after which
fast recovery is invoked.
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