From owner-freebsd-bugs@FreeBSD.ORG Fri Mar 25 15:36:01 2005 Return-Path: Delivered-To: freebsd-bugs@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 246B316A4CE for ; Fri, 25 Mar 2005 15:36:01 +0000 (GMT) Received: from salmon.maths.tcd.ie (salmon.maths.tcd.ie [134.226.81.11]) by mx1.FreeBSD.org (Postfix) with SMTP id 238CF43D53 for ; Fri, 25 Mar 2005 15:36:00 +0000 (GMT) (envelope-from dwmalone@maths.tcd.ie) Received: from walton.maths.tcd.ie by salmon.maths.tcd.ie with SMTP id ; 25 Mar 2005 15:35:59 +0000 (GMT) Date: Fri, 25 Mar 2005 15:35:58 +0000 From: David Malone To: "David G. Lawrence" Message-ID: <20050325153558.GA22521@walton.maths.tcd.ie> References: <20050325152910.GC905@opteron.dglawrence.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20050325152910.GC905@opteron.dglawrence.com> User-Agent: Mutt/1.5.6i Sender: dwmalone@maths.tcd.ie cc: freebsd-bugs@freebsd.org Subject: Re: broken bandwidth-delay product window limiting X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 25 Mar 2005 15:36:01 -0000 On Fri, Mar 25, 2005 at 07:29:10AM -0800, David G. Lawrence wrote: > The "bandwidth-delay product window limiting" code in 5.x appears to be > quite broken. In my tests here, the window is hard limited to 2 segments, > regardless of the actual bandwidth-delay product, and this results in very > poor performance over non-local TCP connections. I'd suggest shipping 5.4 > and future releases with net.inet.tcp.inflight.enable=0 until this problem > can be fixed. Have you seen: http://www.FreeBSD.org/cgi/query-pr.cgi?pr=75122 I wonder if it is the same bug or a different one? David.