From owner-freebsd-performance@FreeBSD.ORG Mon Jun 9 12:47:27 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 042F437B401 for ; Mon, 9 Jun 2003 12:47:27 -0700 (PDT) Received: from perrin.int.nxad.com (internal.ext.nxad.com [69.1.70.251]) by mx1.FreeBSD.org (Postfix) with ESMTP id 672E343FFB for ; Mon, 9 Jun 2003 12:47:06 -0700 (PDT) (envelope-from sean@nxad.com) Received: by perrin.int.nxad.com (Postfix, from userid 1001) id D33D220F01; Mon, 9 Jun 2003 12:47:05 -0700 (PDT) Date: Mon, 9 Jun 2003 12:47:05 -0700 From: Sean Chittenden To: Eric Anderson Message-ID: <20030609194705.GJ65470@perrin.int.nxad.com> References: <3EE4E156.6030603@centtech.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3EE4E156.6030603@centtech.com> X-PGP-Key: finger seanc@FreeBSD.org X-PGP-Fingerprint: 3849 3760 1AFE 7B17 11A0 83A6 DD99 E31F BC84 B341 X-Web-Homepage: http://sean.chittenden.org/ User-Agent: Mutt/1.5.4i 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 19:47:27 -0000 > 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. -sc -- Sean Chittenden