From owner-freebsd-performance@FreeBSD.ORG Mon Jun 9 15:16:39 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 47B4137B401 for ; Mon, 9 Jun 2003 15:16:39 -0700 (PDT) Received: from otter3.centtech.com (moat3.centtech.com [207.200.51.50]) by mx1.FreeBSD.org (Postfix) with ESMTP id 75FBA43FBF for ; Mon, 9 Jun 2003 15:16:38 -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 h59MGb56051497 for ; Mon, 9 Jun 2003 17:16:37 -0500 (CDT) (envelope-from anderson@centtech.com) Message-ID: <3EE50743.1090704@centtech.com> Date: Mon, 09 Jun 2003 17:16:35 -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: freebsd-performance@freebsd.org References: <3EE4E156.6030603@centtech.com> <3EE4FAAF.7060302@mac.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit 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 22:16:39 -0000 Chuck Swiger wrote: > 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. I see it in both NFS and ftp transfers, but like I said in one of my other notes, I have 4 network cards in this machine, all act the same way. > 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? Yes - and I just tried that suggestion - same thing. No help. Interfaces look ok. Eric -- ------------------------------------------------------------------ Eric Anderson Systems Administrator Centaur Technology Attitudes are contagious, is yours worth catching? ------------------------------------------------------------------