From owner-freebsd-performance@FreeBSD.ORG Mon Jun 9 14:23:02 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 EB8DE37B407 for ; Mon, 9 Jun 2003 14:23:02 -0700 (PDT) Received: from out003.verizon.net (out003pub.verizon.net [206.46.170.103]) by mx1.FreeBSD.org (Postfix) with ESMTP id ADC8943FDD for ; Mon, 9 Jun 2003 14:23:01 -0700 (PDT) (envelope-from cswiger@mac.com) Received: from mac.com ([141.149.47.46]) by out003.verizon.net (InterMail vM.5.01.05.33 201-253-122-126-133-20030313) with ESMTP id <20030609212300.XSJJ4805.out003.verizon.net@mac.com>; Mon, 9 Jun 2003 16:23:00 -0500 Message-ID: <3EE4FAAF.7060302@mac.com> Date: Mon, 09 Jun 2003 17:22:55 -0400 From: Chuck Swiger Organization: The Courts of Chaos User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4) Gecko/20030529 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Eric Anderson References: <3EE4E156.6030603@centtech.com> In-Reply-To: <3EE4E156.6030603@centtech.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Authentication-Info: Submitted using SMTP AUTH at out003.verizon.net from [141.149.47.46] at Mon, 9 Jun 2003 16:23:00 -0500 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 21:23:03 -0000 Eric Anderson 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.. > > However, ftping a file or cp'ing over NFS shows speeds less than 1MB/s - > which is not what I would expect - it's got gigabit ethernet, and has > very fast read times (via ftp or nfs) over the network. If the slowdown was only with regard to NFS, I'd ask you about what your NFS clients looked like. However, if you're seeing a slowdown for FTP and other network protocols, it's more likely to be a physical problem with cabling, a NIC getting flaky, or something along those lines. Do you have this connected to a managed switch so that you can take a look at the interface statistics for problems? Maybe try cranking the NIC down from gigabit to 100Mbs ethernet speed and see whether that makes a difference? -Chuck