IETF Logo Mail Archive

Re: [tcpm] Increasing the Initial Window - Notes

Marco Mellia <mellia@tlc.polito.it> Thu, 11 November 2010 10:49 UTC

Return-Path: <mellia@tlc.polito.it>
X-Original-To: tcpm@core3.amsl.com
Delivered-To: tcpm@core3.amsl.com
Received: from localhost (localhost [127.0.0.1]) by core3.amsl.com (Postfix) with ESMTP id 5D14A3A69AD for <tcpm@core3.amsl.com>; Thu, 11 Nov 2010 02:49:30 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -0.719
X-Spam-Level:
X-Spam-Status: No, score=-0.719 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_IT=0.635, HOST_EQ_IT=1.245]
Received: from mail.ietf.org ([64.170.98.32]) by localhost (core3.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id rbsFi3yYX10H for <tcpm@core3.amsl.com>; Thu, 11 Nov 2010 02:49:28 -0800 (PST)
Received: from mail.tlc.polito.it (baobab.polito.it [130.192.9.198]) by core3.amsl.com (Postfix) with SMTP id 290353A6929 for <tcpm@ietf.org>; Thu, 11 Nov 2010 02:49:27 -0800 (PST)
Received: (qmail 14640 invoked by uid 88); 11 Nov 2010 10:49:51 -0000
Received: from gramigna.polito.it (HELO gramigna.polito.it) (130.192.9.144) (smtp-auth username mellia@tlc.polito.it, mechanism cram-md5) by mail.tlc.polito.it (qpsmtpd/0.40) with (AES256-SHA encrypted) ESMTPSA; Thu, 11 Nov 2010 11:49:51 +0100
Message-ID: <4CDBCA4E.8000705@tlc.polito.it>
Date: Thu, 11 Nov 2010 11:49:50 +0100
From: Marco Mellia <mellia@tlc.polito.it>
User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; it; rv:1.9.2.12) Gecko/20101027 Thunderbird/3.1.6
MIME-Version: 1.0
To: Michael Welzl <michawe@ifi.uio.no>
References: <20101110152857.GA5094@hell> <AANLkTi=RzbPbVRDQh7y-ydY-P7H16wDri=8EtXP5QuV3@mail.gmail.com> <20101111012453.GB2691@hell> <29E76BE6-32D9-45AD-85A1-791DAADDE520@ifi.uio.no> <AANLkTik69zRJ7XcWK7ZKCYaHPP0=Z6hnhP1SUnYP=d=8@mail.gmail.com> <824FC88F-4877-45DC-AFD9-E5272ACD7C3E@ifi.uio.no>
In-Reply-To: <824FC88F-4877-45DC-AFD9-E5272ACD7C3E@ifi.uio.no>
Content-Type: text/plain; charset="ISO-8859-1"; format="flowed"
Content-Transfer-Encoding: 7bit
X-TLC-MailScanner-Information: Please contact the ISP for more information
X-TLC-MailScanner: Found to be clean
X-TLC-MailScanner-SpamCheck: not spam, SpamAssassin (score=-3.739, required 4, autolearn=not spam, ALL_TRUSTED -1.80, AWL 0.66, BAYES_00 -2.60)
X-TLC-MailScanner-From: mellia@tlc.polito.it
Cc: Mike Belshe <mbelshe@google.com>, tmrg <tmrg-interest@icsi.berkeley.edu>, Matt Mathis <mattmathis@google.com>, tcpm <tcpm@ietf.org>
Subject: Re: [tcpm] Increasing the Initial Window - Notes
X-BeenThere: tcpm@ietf.org
X-Mailman-Version: 2.1.9
Precedence: list
List-Id: TCP Maintenance and Minor Extensions Working Group <tcpm.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/listinfo/tcpm>, <mailto:tcpm-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/tcpm>
List-Post: <mailto:tcpm@ietf.org>
List-Help: <mailto:tcpm-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/tcpm>, <mailto:tcpm-request@ietf.org?subject=subscribe>
X-List-Received-Date: Thu, 11 Nov 2010 10:49:30 -0000

>> I certainly won't object to this, if that's all it takes for
>> standardization. Unfortunately the
>> point for the non-convinced is they don't want ANY flows to use IW10
>> for fear of hurting
>> the performance of their flows.
>
> ... but here, your "browsers open tens of flows" argument totally 
> holds. How is a web flow with IW10 worse than a browser opening tens 
> of flows? If people only use it for the web, like Google has been 
> successfully doing, this seems to be quite safe, based on experience.
>
> I'm curious what the opposition says to this  :)

If today a brower opens 10 flows with a server using IW=1 you gets 10 
packets equivalent IW.
Increasing the IW to 10 leads to an equivalent IW of 100 packets. At 
that point, you DSL modem will definitively start dropping most of them...

-- 

Ciao,                    /\/\/\rco

+-----------------------------------+
| Marco Mellia - Assistant Professor|
| Skypeid: mgmellia                 |
| Tel: +39-011-564-4173             |
| Cel: +39-340-9674888              |   /"\  .. . . . . . . . . . . . .
| Politecnico di Torino             |   \ /  . ASCII Ribbon Campaign  .
| Corso Duca degli Abruzzi 24       |    X   .- NO HTML/RTF in e-mail .
| Torino - 10129 - Italy            |   / \  .- NO Word docs in e-mail.
| http://www.telematica.polito.it   |        .. . . . . . . . . . . . .
+-----------------------------------+
The box said "Requires Windows 95 or Better." So I installed Linux.

v2.23.0 | Report a Bug | By Email