From owner-freebsd-questions Tue May 26 20:20:07 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id UAA01461 for freebsd-questions-outgoing; Tue, 26 May 1998 20:20:07 -0700 (PDT) (envelope-from owner-freebsd-questions@FreeBSD.ORG) Received: from gdi.uoregon.edu (gdi.uoregon.edu [128.223.170.30]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id UAA01390; Tue, 26 May 1998 20:19:55 -0700 (PDT) (envelope-from dwhite@gdi.uoregon.edu) Received: from localhost (dwhite@localhost) by gdi.uoregon.edu (8.8.8/8.8.8) with SMTP id UAA29780; Tue, 26 May 1998 20:19:40 -0700 (PDT) (envelope-from dwhite@gdi.uoregon.edu) Date: Tue, 26 May 1998 20:19:40 -0700 (PDT) From: Doug White Reply-To: Doug White To: Greg Lehey cc: dyson@FreeBSD.ORG, lfloyd@sonic.net, freebsd-questions@FreeBSD.ORG Subject: Re: Compatibility with Ultra IDE drives? In-Reply-To: <19980525094043.M15604@freebie.lemis.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG 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? IDE kills interactive response. Doug White | University of Oregon Internet: dwhite@resnet.uoregon.edu | Residence Networking Assistant http://gladstone.uoregon.edu/~dwhite | Computer Science Major To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message