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Status:Verified (2)

RFC 3390, "Increasing TCP's Initial Window", October 2002

Errata ID:4569
Status: Verified
Type: Technical
Publication Format(s) : TEXT
Reported By: Nikolai Malykh
Date Reported: 2015-12-22
Verifier Name: Martin Stiemerling
Date Verified: 2016-01-12

Section 8.1 says:

   A second set of experiments explored TCP performance over dialup   modem links.  In experiments over a 28.8 bps dialup channel [All97a,   AHO98], a four-segment initial window decreased the transfer time of   a 16KB file by roughly 10%, with no accompanying increase in the drop   rate.  A simulation study [RFC2416] investigated the effects of using   a larger initial window on a host connected by a slow modem link and   a router with a 3 packet buffer.  The study concluded that for the   scenario investigated, the use of larger initial windows was not   harmful to TCP performance.

It should say:

   A second set of experiments explored TCP performance over dialup   modem links.  In experiments over a 28.8 kbps dialup channel [All97a,   AHO98], a four-segment initial window decreased the transfer time of   a 16KB file by roughly 10%, with no accompanying increase in the drop   rate.  A simulation study [RFC2416] investigated the effects of using   a larger initial window on a host connected by a slow modem link and   a router with a 3 packet buffer.  The study concluded that for the   scenario investigated, the use of larger initial windows was not   harmful to TCP performance.

Notes:

Error bit rate - kbps instead of bps.

Errata ID:4583
Status: Verified
Type: Technical
Publication Format(s) : TEXT
Reported By: Joe Touch
Date Reported: 2016-01-06
Verifier Name: Martin Stiemerling
Date Verified: 2016-04-03

Section 1. says:

   This increased initial window is optional: a TCP MAY start with a   larger initial window.  However, we expect that most general-purpose   TCP implementations would choose to use the larger initial congestion   window given in equation (1) above.

It should say:

   This increased initial window is optional: a TCP MAY start with a   smaller initial window.  However, we expect that most general-purpose   TCP implementations would choose to use the larger initial congestion   window given in equation (1) above.

Notes:

The MAY allows use of values smaller than this document allows, not larger.

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