IETF Logo Mail Archive

Re: [tsvwg] Switch testing at 25G with ECN --SCE Draft

John Leslie <john@jlc.net> Fri, 09 August 2019 23:33 UTC

Return-Path: <john@jlc.net>
X-Original-To: tsvwg@ietfa.amsl.com
Delivered-To: tsvwg@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1D0A0120059 for <tsvwg@ietfa.amsl.com>; Fri, 9 Aug 2019 16:33:00 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.9
X-Spam-Level:
X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id LMw0gg7P-t9S for <tsvwg@ietfa.amsl.com>; Fri, 9 Aug 2019 16:32:59 -0700 (PDT)
Received: from mailhost.jlc.net (mailhost.jlc.net [199.201.159.4]) by ietfa.amsl.com (Postfix) with ESMTP id D4F90120048 for <tsvwg@ietf.org>; Fri, 9 Aug 2019 16:32:58 -0700 (PDT)
Received: by mailhost.jlc.net (Postfix, from userid 104) id 4B34B908A0D; Fri, 9 Aug 2019 19:32:58 -0400 (EDT)
Date: Fri, 09 Aug 2019 19:32:58 -0400
From: John Leslie <john@jlc.net>
To: Jonathan Morton <chromatix99@gmail.com>
Cc: tsvwg@ietf.org
Message-ID: <20190809233258.GG51059@verdi>
References: <AT5PR8401MB0707070957A7362C337315CE99D50@AT5PR8401MB0707.NAMPRD84.PROD.OUTLOOK.COM> <LEXPR01MB0463979351E02563F570ECD59CD40@LEXPR01MB0463.DEUPRD01.PROD.OUTLOOK.DE> <DADF5358-70FB-4290-A94B-4926631D1575@gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Disposition: inline
In-Reply-To: <DADF5358-70FB-4290-A94B-4926631D1575@gmail.com>
User-Agent: Mutt/1.6.1 (2016-04-27)
Archived-At: <https://mailarchive.ietf.org/arch/msg/tsvwg/mY7mxILJt2JjFG1sfdkZ9beHics>
Subject: Re: [tsvwg] Switch testing at 25G with ECN --SCE Draft
X-BeenThere: tsvwg@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Transport Area Working Group <tsvwg.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/tsvwg>, <mailto:tsvwg-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/tsvwg/>
List-Post: <mailto:tsvwg@ietf.org>
List-Help: <mailto:tsvwg-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/tsvwg>, <mailto:tsvwg-request@ietf.org?subject=subscribe>
X-List-Received-Date: Fri, 09 Aug 2019 23:33:00 -0000

Jonathan Morton <chromatix99@gmail.com> wrote:
>> On 7 Aug, 2019, at 10:47 am, <Ruediger.Geib@telekom.de> <Ruediger.Geib@telekom.de> wrote:
>> 
>> I think to recall that a colleague noticed random initial packet drop
>> bursts with IPERF3 too (and stopped using it).
> 
> These are almost certainly associated with slow-start, whose
> exponential growth is that much harder to control than subsequent
> linear growth.

   It's kind of silly that each new TCP connection starts with the
assumption that it knows absolutely nothing about the likely capacity
and congestion of the route to its destination.

   Can't we do something to fix this?

--
John Leslie <john@jlc.net>

v2.23.0 | Report a Bug | By Email