Date: Wed, 27 May 1998 16:17:00 +0930 From: Greg Lehey <grog@lemis.com> To: Doug White <dwhite@resnet.uoregon.edu> Cc: dyson@FreeBSD.ORG, lfloyd@sonic.net, freebsd-questions@FreeBSD.ORG Subject: Re: Compatibility with Ultra IDE drives? Message-ID: <19980527161700.G24133@freebie.lemis.com> In-Reply-To: <Pine.BSF.3.96.980526201921.13318U-100000@gdi.uoregon.edu>; from Doug White on Tue, May 26, 1998 at 08:19:40PM -0700 References: <19980525094043.M15604@freebie.lemis.com> <Pine.BSF.3.96.980526201921.13318U-100000@gdi.uoregon.edu>
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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
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