From owner-freebsd-net@FreeBSD.ORG Mon May 21 19:19:05 2007 Return-Path: X-Original-To: freebsd-net@freebsd.org Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 7E65216A469 for ; Mon, 21 May 2007 19:19:05 +0000 (UTC) (envelope-from security@jim-liesl.org) Received: from qsmtp1.mc.surewest.net (qsmtp.mc.surewest.net [66.60.130.145]) by mx1.freebsd.org (Postfix) with SMTP id 493DF13C4BC for ; Mon, 21 May 2007 19:19:05 +0000 (UTC) (envelope-from security@jim-liesl.org) Received: (qmail 23658 invoked from network); 21 May 2007 11:52:25 -0700 Received: by simscan 1.1.0 ppid: 23628, pid: 23630, t: 4.2510s scanners: regex: 1.1.0 attach: 1.1.0 clamav: 0.90.1/m:43 spam: 3.1.7-deb Received: from unknown (HELO daemon.jim-liesl.org) (66.60.173.44) by qsmtp1 with SMTP; 21 May 2007 11:52:21 -0700 Received: from daemon.jim-liesl.org (localhost.static.surewest.net [127.0.0.1]) by daemon.jim-liesl.org (Postfix) with ESMTP id 145535C1D; Mon, 21 May 2007 11:52:21 -0700 (PDT) Received: from [127.0.0.1] (daemon.static.surewest.net [192.168.1.15]) by daemon.jim-liesl.org (Postfix) with ESMTP id C2DF45C1C; Mon, 21 May 2007 11:52:20 -0700 (PDT) Message-ID: <4651EA68.7010001@jim-liesl.org> Date: Mon, 21 May 2007 11:52:24 -0700 From: security User-Agent: Thunderbird 1.5.0.10 (Windows/20070221) MIME-Version: 1.0 To: Tom Judge References: <4651DB6E.5090102@jim-liesl.org> <4651E74A.2080202@tomjudge.com> In-Reply-To: <4651E74A.2080202@tomjudge.com> X-Enigmail-Version: 0.94.1.1 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Virus-Scanned: ClamAV using ClamSMTP X-Spam-Checker-Version: SpamAssassin 3.0.3 (2005-04-27) on qsmtp1.surewest.net X-Spam-Level: X-Spam-Status: No, score=-2.3 required=5.0 tests=AWL,BAYES_00 autolearn=ham version=3.0.3 Cc: freebsd-net@freebsd.org Subject: Re: asymetric speeds over gigE link 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: Mon, 21 May 2007 19:19:05 -0000 Tom Judge wrote: > Have you tried upping the MTU, that is if the cards and switch you are > using support it. I have seen significant speed increases (FreeBSD - > FreeBSD) in some scenario's twice the through put with an MTU of 8192. > > I have also seen 700Mb/s sustained FreeBSD - FreeBSD using the openssh > HPN patch set and no extra tuning of the network stack. Which makes > me think that maybe the linux stack needs some tuning? > > Just some ideas > > Tom Thanks Tom. I played with "jumbo's", but the switch didn't seem to like it. I'll also chase this from the linux side too. I may be able to bring up a scratch box with 6.2, and see what freebsd <-> freebsd perf seems like. jim