From owner-freebsd-questions Mon Dec 20 11:17:39 1999 Delivered-To: freebsd-questions@freebsd.org Received: from sticky.usu.edu (sticky.usu.edu [129.123.1.155]) by hub.freebsd.org (Postfix) with ESMTP id C185015313 for ; Mon, 20 Dec 1999 11:17:36 -0800 (PST) (envelope-from hal@sticky.usu.edu) Received: from [129.123.1.184] (buffy.usu.edu [129.123.1.184]) by sticky.usu.edu (Postfix) with ESMTP id EE47034827; Mon, 20 Dec 1999 12:17:28 -0700 (MST) Message-Id: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Mon, 20 Dec 1999 12:17:27 -0700 To: FreeBSDQuestions From: hal Lynch Subject: Re: when is it safe to use the 0xa0ffa0ff disk flags? Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG >It isn't a function of the disk as much as an interaction between the >disk and the rest of the hardware. It is something you can test before >you fix it in the kernel. These parameters can be configured during >boot. Changing them at boot time lets you test the configuration and >then make it permanent by adding the flags in your kernel. I went from >2-3MB/s to 12-14MB/s. This isn't a trivial improvement :). I made the changes to my kernel and indeed I saw an improvement, but not nearly as much as you (2.4MB/s to 2.7MB/s)?! I then received a minor revalation that that I should look at the bios. After setting Ultra DMA and PIO/DMA modes to AUTO and Block Mode sectors to HDD MAX I finally got what I paid for 15MB/s. There's a lesson in there somewhere! hal To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message