Re: [tsvwg] [Technical Errata Reported] RFC3390 (4569)

[Mitchell Erblich <[e-mail]>]

Mark Allman and group,

		As a later follow-up….

		Wouldn’t it make sense to mention that TCP’s Reno’s Fast Re-transmit” capability suggests that initial increases of  the initial window should generate earlier detection of congestion because of the non-wait of the coarse timeout ,, assuming that the number of Dup ACKs is adjusted accordingly?

		Mitchell Erblich


On Jan 4, 2016, at 11:49 AM, Mark Allman <[e-mail]> wrote:

> 
> Yep- this is a small error that could well be noted in the RFC
> errata.
> 
> I looked at it has its roots in RFC 2414 (the RFC that 3390
> obsoleted).  So, you might as well add a note to that one, too.
> 
> allman
> 
> 
> 
>> The following errata report has been submitted for RFC3390,
>> "Increasing TCP's Initial Window".
>> 
>> --------------------------------------
>> You may review the report below and at:
>> http://www.rfc-editor.org/errata_search.php?rfc=3390&eid=4569
>> 
>> --------------------------------------
>> Type: Technical
>> Reported by: Nikolai Malykh <[e-mail]>
>> 
>> Section: 8.1
>> 
>> Original Text
>> -------------
>>   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.
>> 
>> Corrected Text
>> --------------
>>   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 - bps instead of Kbps.
>> 
>> Instructions:
>> -------------
>> This erratum is currently posted as "Reported". If necessary, please
>> use "Reply All" to discuss whether it should be verified or
>> rejected. When a decision is reached, the verifying party (IESG)
>> can log in to change the status and edit the report, if necessary. 
>> 
>> --------------------------------------
>> RFC3390 (draft-ietf-tsvwg-initwin-04)
>> --------------------------------------
>> Title: Increasing TCP's Initial Window
>> Publication Date    : October 2002
>> Author(s): M. Allman, S. Floyd, C. Partridge
>> Category: PROPOSED STANDARD
>> Source: Transport Area Working Group
>> Area: Transport
>> Stream: IETF
>> Verifying Party     : IESG
> 
> 
> 
>