A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Alteration of Karn's Algorithm for High Bandwidth / Delay Environments
Author(s) : M. Erblich
Filename : draft-erblich-tcp-no-karn-alg-00.txt
Pages :
Date : 2006-8-14
Karn's algorithm specifies acknowledgements that are the
result of segment retransmits should be ignored, not timed,
and should not contribute to the smoothed round-trip-time
(SRTT) because they are considered "ambiguous". It is also
stated in Karn's paper that "If an acknowledgement arrives
after the RTO has expired, it is highly likely to come very
shortly after wards." In time, we have added the "fast retransmit"
functionality, so we are not solely dependent on RTO for
retransmits. Common sense dictates that if we receive an
acknowledgement "very shortly after wards", that those
acknowledgments should not be considered "ambiguous". These
non-ambiguous acknowledgments should be added to the SRTT and
trigger us to return to our previous non-congestion behavior.
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