From owner-freebsd-net@FreeBSD.ORG Sat Sep 15 17:31:36 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 AA32516A419 for ; Sat, 15 Sep 2007 17:31:36 +0000 (UTC) (envelope-from randy@psg.com) Received: from rip.psg.com (rip.psg.com [147.28.0.39]) by mx1.freebsd.org (Postfix) with ESMTP id 9058C13C478 for ; Sat, 15 Sep 2007 17:31:36 +0000 (UTC) (envelope-from randy@psg.com) Received: from cust16202.lava.net ([64.65.95.74] helo=[192.168.0.102]) by rip.psg.com with esmtpsa (TLSv1:AES256-SHA:256) (Exim 4.67 (FreeBSD)) (envelope-from ) id 1IWbUV-000K9n-Qe; Sat, 15 Sep 2007 17:31:35 +0000 Message-ID: <46EC16DC.2010104@psg.com> Date: Sat, 15 Sep 2007 07:31:08 -1000 From: Randy Bush User-Agent: Thunderbird 2.0.0.6 (Windows/20070728) MIME-Version: 1.0 To: Julian Elischer References: <46EAE78D.8060108@elischer.org> <46EC0E75.5070307@psg.com> <46EC1575.4070401@elischer.org> In-Reply-To: <46EC1575.4070401@elischer.org> X-Enigmail-Version: 0.95.3 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: FreeBSD Net Subject: Re: BCE on FreeBSD and oversized packet acceptance. 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: Sat, 15 Sep 2007 17:31:36 -0000 >>> what size is the actual maximal sized jumbo packet we will ever see? >> some transpac science community folk, who care more about speed trials >> with big data sets than they do about over-stretching the ethernet crc, >> use 9k jumbo frames. > well that's the standard but the highest I've seen mentioned as a normal > size is I think 9220 bytes. i suggest being careful with the word "standard." ieee, which controls the ethernet spec, has refused to standardize anything above 1500 on the grounds that it would over-stretch the crc. randy