Subject: [Tsvwg] Internet-Draft on avoiding unnecessary retransmissions after TCP RTO

From: [email-masked]
Date: Tue, 25 Jun 2002 11:26:36 +0300

Hi,

We have a new internet-draft titled "F-RTO: A TCP RTO Recovery Algorithm for Avoiding Unnecessary Retransmissions" available at
http://www.cs.Helsinki.FI/u/sarolaht/papers/draft-sarolahti-tsvwg-tcp-frto-00.txt

The draft describes an algorithm for avoiding unnecessary retransmissions after spurious TCP RTOs. We believe that the F-RTO algorithm can be safely employed as an alternative RTO recovery algorithm for TCP, and thought it would be interesting to this group. We would appreciate any feedback on the draft.

Unfortunately I missed the submission deadline for Yokohama, but the draft can be found in the location given above until it is resubmitted after Yokohama.

Abstract:
   Spurious retransmission timeouts (RTOs) cause suboptimal TCP
   performance, because they often result in unnecessary retransmission
   of the last window of data. This document describes the "Forward RTO
   Recovery" (F-RTO) algorithm for recovering from the TCP RTOs
   efficiently even when the RTO was spurious. F-RTO is a TCP sender
   only algorithm that does not require any TCP options to operate.
   After retransmitting the first unacknowledged segment triggered by an
   RTO, the F-RTO algorithm at a TCP sender monitors the incoming
   acknowledgements to determine whether the timeout was spurious and to
   decide whether to send new segments or retransmit unacknowledged
   segments. The algorithm effectively avoids additional unnecessary
   retransmissions and thereby improves TCP performance in case of a
   spurious timeout.

Regards,
- Pasi

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