From owner-freebsd-net@FreeBSD.ORG Fri Jul 20 22:59:18 2007 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 3C9F516A417 for ; Fri, 20 Jul 2007 22:59:18 +0000 (UTC) (envelope-from artemb@gmail.com) Received: from nf-out-0910.google.com (nf-out-0910.google.com [64.233.182.188]) by mx1.freebsd.org (Postfix) with ESMTP id C1F3A13C494 for ; Fri, 20 Jul 2007 22:59:17 +0000 (UTC) (envelope-from artemb@gmail.com) Received: by nf-out-0910.google.com with SMTP id b2so69482nfb for ; Fri, 20 Jul 2007 15:59:16 -0700 (PDT) DKIM-Signature: a=rsa-sha1; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:message-id:date:from:sender:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references:x-google-sender-auth; b=OHP8Zef1XKLr3vMNR3HYWCnAcvLUJ68F0YkUksHIVtYZxiW6Fgn+IV4rmKyMgUcucg+3baPKz542r2Zub9nFy8F/pVd9+92rhuVyZR9Oy7cWwW/EulIcD93zmPI5Y4AvizS/eYbuYLft+S2AVZmr81A+X032Ry+QPC86LpfYLPI= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:sender:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references:x-google-sender-auth; b=PF3pPDLKIpbOrRwYD5ziVdd39AMMdLteCj6U5wttsIzcSoy3WwIb8w03dCEevwkaxcfbAobGeXiF8UtHU77lfrNv/x6UvmFz5+ssa/Qu2Qav7TSCZRw7aNscoDXChlo9+bF+jqD54S6pPr8blLV7+0SEEHGFDXZFPRW9ayYEdEU= Received: by 10.82.174.20 with SMTP id w20mr948577bue.1184970869945; Fri, 20 Jul 2007 15:34:29 -0700 (PDT) Received: by 10.82.105.7 with HTTP; Fri, 20 Jul 2007 15:34:29 -0700 (PDT) Message-ID: Date: Fri, 20 Jul 2007 15:34:29 -0700 From: "Artem Belevich" Sender: artemb@gmail.com To: "Eli Dart" In-Reply-To: <46A10860.50804@es.net> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <200707150237.l6F2bAgZ011098@redrock.karels.net> <469E0FFF.8070802@seclark.us> <20070720172021.8EA3D13C4B3@mx1.freebsd.org> <46A10063.9010902@elischer.org> <46A10860.50804@es.net> X-Google-Sender-Auth: b2c5ad3c4af5d85e Cc: freebsd-net@freebsd.org, Julian Elischer Subject: Re: 6.2 mtu now limits size of incomming packet X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 20 Jul 2007 22:59:18 -0000 Here's one example where MTU!=MRU would be useful. Think of asymmetric bandwith-limited ADSL links. Lower MTU would allow lower TX latency for high priority packets when upstream is saturated, yet large MRU on the downstream would be great for downloads. Right now with 6.2 one has to trade off lower latency for faster download. --Artem