From owner-freebsd-questions Tue May 26 23:48:06 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id XAA13950 for freebsd-questions-outgoing; Tue, 26 May 1998 23:48:06 -0700 (PDT) (envelope-from owner-freebsd-questions@FreeBSD.ORG) Received: from freebie.lemis.com (freebie.lemis.com [139.130.136.133]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id XAA13801; Tue, 26 May 1998 23:47:19 -0700 (PDT) (envelope-from grog@lemis.com) Received: (from grog@localhost) by freebie.lemis.com (8.8.8/8.8.7) id QAA15333; Wed, 27 May 1998 16:17:01 +0930 (CST) (envelope-from grog) Message-ID: <19980527161700.G24133@freebie.lemis.com> Date: Wed, 27 May 1998 16:17:00 +0930 From: Greg Lehey To: Doug White Cc: dyson@FreeBSD.ORG, lfloyd@sonic.net, freebsd-questions@FreeBSD.ORG Subject: Re: Compatibility with Ultra IDE drives? References: <19980525094043.M15604@freebie.lemis.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.91.1i In-Reply-To: ; from Doug White on Tue, May 26, 1998 at 08:19:40PM -0700 WWW-Home-Page: http://www.lemis.com/~grog Organization: LEMIS, PO Box 460, Echunga SA 5153, Australia Phone: +61-8-8388-8286 Fax: +61-8-8388-8725 Mobile: +61-41-739-7062 Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Tue, 26 May 1998 at 20:19:40 -0700, Doug White wrote: > On Mon, 25 May 1998, Greg Lehey wrote: > >>> Given you have a very fast machine to start with (like a fast P5 or >>> faster), bus-master DMA does help alot. There is a very noticable >>> difference in responsiveness of the system under load with the >>> DMA. I actually wasn't convinced until I mistakenly built a system >>> without the DMA, and noticed that it was somehow "slow." >> >> I was recently rather astonished with the performance of modern IDE >> drives, and spent some time comparing the time for a 'make world' on >> a K6/233 with 96 MB of memory. Here are the results for an IBM DORS >> SCSI drive with an Adaptec 2940 host adaptor, and an IBM DHEA IDE >> drive with normal and Ultra DMA: >> >> Disk Elapsed User System >> >> DORS 126m22.811s 66m2.051s 16m28.411s >> DHEA 124m54.116s 65m3.465s 18m50.257s >> DHEA/Ultra 111m21.743s 66m24.344s 18m37.329s > > Yeah, but were you doing anything at the time? Making the world. > IDE kills interactive response. Not true. What gives you that idea? Greg -- See complete headers for address and phone numbers finger grog@lemis.com for PGP public key To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message