From owner-freebsd-mobile Mon Mar 12 19:16:10 2001 Delivered-To: freebsd-mobile@freebsd.org Received: from grumpy.dyndns.org (user-24-214-76-236.knology.net [24.214.76.236]) by hub.freebsd.org (Postfix) with ESMTP id 9BE5337B718; Mon, 12 Mar 2001 19:16:00 -0800 (PST) (envelope-from dkelly@grumpy.dyndns.org) Received: from localhost (localhost [127.0.0.1]) by grumpy.dyndns.org (8.11.2/8.11.2) with ESMTP id f2D3DTe08249; Mon, 12 Mar 2001 21:13:29 -0600 (CST) (envelope-from dkelly@grumpy.dyndns.org) Message-Id: <200103130313.f2D3DTe08249@grumpy.dyndns.org> X-Mailer: exmh version 2.3.1 01/18/2001 with nmh-1.0.4 To: Alfred Perlstein Cc: Kevin Oberman , Soren Schmidt , mobile@FreeBSD.ORG, stable@FreeBSD.ORG From: David Kelly Subject: Re: Disk I/O problem in 4.3-BETA In-reply-to: Message from Alfred Perlstein of "Mon, 12 Mar 2001 17:14:59 PST." <20010312171459.P18351@fw.wintelcom.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Mon, 12 Mar 2001 21:13:29 -0600 Sender: owner-freebsd-mobile@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org Alfred Perlstein writes: > * David Kelly [010312 16:48] wrote: > > > The FreeBSD kernel has a built in daemon called syncer. It sounds like > > a natural place to periodically issue a sync command to such storage > > devices. Assuming such a command exists. > > This won't work. The syncer exists to: [...] > The problem is that you still have the writecaching going on > so the ordering can get messed up. Thanks for the excellent reply. Sitting here thinking, "Duh. I knew that. Why didn't I remember that before sending?" Maybe I can blame it on the low level sinus headache which has made me grumpy all day. > > My "purchased because they threw in a USB Zip-100 and ATA-100 PCI card" > > 45G Maxtor is awfully impressive. 32000 blocks of 128k staring 8G from > > the begining of the disk resulted in over 30MB/sec according to dd. I'm > > stunned. Kernel from mid-Feb. > > > > :P showoff... :) Altho the thread is on writing the above was the read speed. Well, yes and no. Partialy its an atta-boy for Soren. After all, "everybody knows SCSI is the only serious storage media" yet Soren made the ATA stuff scream. I still boot SCSI on this machine because I always have. But no longer fret when budget doesn't allow for SCSI on something at work. Now if I really wanted to brag I'd tell you I got the HD and zip drive from Staples in December for a total of $180 (plus tax). Had to pay $53.90 for the ATA-100 card but my $50 rebate arrived today. :-) -- David Kelly N4HHE, dkelly@hiwaay.net ===================================================================== The human mind ordinarily operates at only ten percent of its capacity -- the rest is overhead for the operating system. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-mobile" in the body of the message