From owner-freebsd-performance@FreeBSD.ORG Mon Jun 9 12:49:37 2003 Return-Path: Delivered-To: freebsd-performance@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 6AF6C37B401 for ; Mon, 9 Jun 2003 12:49:37 -0700 (PDT) Received: from otter3.centtech.com (moat3.centtech.com [207.200.51.50]) by mx1.FreeBSD.org (Postfix) with ESMTP id B5AC343FBD for ; Mon, 9 Jun 2003 12:49:36 -0700 (PDT) (envelope-from anderson@centtech.com) Received: from centtech.com (electron.centtech.com [204.177.173.173]) by otter3.centtech.com (8.12.3/8.12.3) with ESMTP id h59JnY56038409; Mon, 9 Jun 2003 14:49:34 -0500 (CDT) (envelope-from anderson@centtech.com) Message-ID: <3EE4E4CB.4060108@centtech.com> Date: Mon, 09 Jun 2003 14:49:31 -0500 From: Eric Anderson User-Agent: Mozilla/5.0 (X11; U; Linux i386; en-US; rv:1.0.1) Gecko/20020823 Netscape/7.0 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Sean Chittenden References: <3EE4E156.6030603@centtech.com> <20030609194705.GJ65470@perrin.int.nxad.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit cc: freebsd-performance@freebsd.org Subject: Re: Slow disk write speeds over network X-BeenThere: freebsd-performance@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Performance/tuning List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 09 Jun 2003 19:49:37 -0000 Sean Chittenden wrote: >>Ok, I have a file server (NFS) running FreeBSD 4.8-RC1, which is having >>incredibly slow disk write speeds. Locally, doing something like: >>dd if=/dev/zero of=/partition/testfile >>Shows 14MB/s - which is what I expect.. > > > Check your cabling... you may have a bad pair in your cable on your > send wires, or at least a crummy pair with high resistance. See if > netstat -i has any errors listed. A change in performance that > dramatic and only in one direction is disturbing and doesn't sound > like a kernel or software issue, though I could be quite wrong. Well, I don't believe that it is a problem - I have 4 gigabit network cards in the machine (connected to 4 different networks), and all act this same way - all use different types of cables too. I've also tried several different client machines. Eric -- ------------------------------------------------------------------ Eric Anderson Systems Administrator Centaur Technology Attitudes are contagious, is yours worth catching? ------------------------------------------------------------------