From owner-freebsd-hackers Fri Nov 30 14:10:16 2001 Delivered-To: freebsd-hackers@freebsd.org Received: from po3.wam.umd.edu (po3.wam.umd.edu [128.8.10.165]) by hub.freebsd.org (Postfix) with ESMTP id D2F1537B41C for ; Fri, 30 Nov 2001 14:10:05 -0800 (PST) Received: from rac4.wam.umd.edu (IDENT:root@rac4.wam.umd.edu [128.8.10.144]) by po3.wam.umd.edu (8.9.3/8.9.3) with ESMTP id RAA21329; Fri, 30 Nov 2001 17:10:03 -0500 (EST) Received: from rac4.wam.umd.edu (IDENT:sendmail@localhost [127.0.0.1]) by rac4.wam.umd.edu (8.9.3/8.9.3) with SMTP id RAA21488; Fri, 30 Nov 2001 17:10:03 -0500 (EST) Received: from localhost (culverk@localhost) by rac4.wam.umd.edu (8.9.3/8.9.3) with ESMTP id RAA21484; Fri, 30 Nov 2001 17:10:02 -0500 (EST) X-Authentication-Warning: rac4.wam.umd.edu: culverk owned process doing -bs Date: Fri, 30 Nov 2001 17:10:02 -0500 (EST) From: Kenneth Wayne Culver To: trim_your_ccs@loopback.net Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: TCP Performance Graphs In-Reply-To: <15367.54349.876429.742833@grasshopper.cs.duke.edu> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG > > The question that immediately comes to mind is, why not simply use > > as big a value as possible? The problem comes down to buffering > > the data, and busy servers may have to buffer a lot of data. Having > > a 1 meg window size may have you buffer 1 meg per connection. Note > > that FreeBSD's current buffer management is particularly stupid in > > that it will _always_ buffer 1 Meg, need it or not. Until we fix > > this we need an interim solution. > > > > I thought that I heard a few months ago that Matt Dillon was looking > at ways to dynamically size tcp windows from within the kernel. Maybe > I'm on crack. You're not on crack, I don't know if it was Matt Dillon, but someone was doing this, I was using the patches for about a month to test them out. Ken > > Maybe we should look at the Dynamic Righsizing work being done at > LANL. See "Dynamic Adjustment of TCP Window Sizes" and > "Dynamic Right-Sizing: A Simulation Study" at > http://public.lanl.gov/radiant/publications.html > > Cheers, > > Drew > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-hackers" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message