From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cassarossa.samfundet.no (cassarossa.samfundet.no [IPv6:2001:67c:29f4::29]) (using TLSv1 with cipher DHE-RSA-AES128-SHA (128/128 bits)) (Client did not present a certificate) by huchra.bufferbloat.net (Postfix) with ESMTPS id 9F90721F4EC for ; Thu, 11 Sep 2014 10:40:41 -0700 (PDT) Received: from pannekake.samfundet.no ([2001:67c:29f4::50] ident=unknown) by cassarossa.samfundet.no with esmtps (TLS1.2:DHE_RSA_AES_128_CBC_SHA1:128) (Exim 4.80) (envelope-from ) id 1XS8MH-0001u8-Vj for bloat@lists.bufferbloat.net; Thu, 11 Sep 2014 19:40:38 +0200 Received: from sesse by pannekake.samfundet.no with local (Exim 4.80) (envelope-from ) id 1XS8MH-00062o-N6 for bloat@lists.bufferbloat.net; Thu, 11 Sep 2014 19:40:37 +0200 Date: Thu, 11 Sep 2014 19:40:37 +0200 From: "Steinar H. Gunderson" To: bloat@lists.bufferbloat.net Message-ID: <20140911174037.GA22515@sesse.net> References: <000001cfc609$697feb30$3c7fc190$@duckware.com> <1410455146.7106.55.camel@edumazet-glaptop2.roam.corp.google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <1410455146.7106.55.camel@edumazet-glaptop2.roam.corp.google.com> X-Operating-System: Linux 3.16.0-rc5 on a x86_64 User-Agent: Mutt/1.5.21 (2010-09-15) Subject: Re: [Bloat] What is wrong with Microsoft's receive window auto-tuning? X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 11 Sep 2014 17:41:11 -0000 On Thu, Sep 11, 2014 at 10:05:46AM -0700, Eric Dumazet wrote: >> Is anyone aware of any research either pointing out how their tuning >> algorithm works, or of known bugs/problems with the algorithm? > How BDP suggests a receive window of 750k ? > > If BDP _is_ 750k, then 3.8 MB receive window is not insane, it depends > on the amount of drops and how fast you want to recover from drops. If it helps, I've seen problems in Linux' auto-tuning as well, so this is seemingly a hard problem :-) /* Steinar */ -- Homepage: http://www.sesse.net/