Date: Thu, 26 Oct 2000 09:25:18 +0100 From: Steve Coles <scoles@tripos.com> To: ArildV@ifi.uib.no Cc: freebsd-hardware@FreeBSD.ORG Subject: Re: Promise Ultra-ATA100 vs FastTrak 100 Speeds Message-ID: <39F7EA6E.A4FCEE20@tripos.com> References: <39F59F1C.A31756E8@rasmus.uib.no>
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Thanks for the reply, this would account for the fact that no matter how = I configure the drives on the Ultra-100, the speed is always the same withi= n the scope of the test ( bonnie results on a UFS for the tests were always the same from one disk combination to another - only slower ). Of course, I forgot to mention there was one other variation between the tests - the controllers were tested in different MOBOs. Ultra in a cheap PCChips MOBO K6-2@550, FastTrak was in a GigaByte, SIS 5591-based, K6-2@3= 50. So the noticably slower speeds were in the faster system with the Ultra-1= 00. The PCChips MOBO in the test has a SIS 5595/530 ATA controller that ~purports~ to be ATA/66, yet the FreeBSD code says it is only ATA/33. I think that this could be the cause ( the MOBO, not the FreeBSD ata code ) I have tried to run this MOBO controller at ATA/66 with the FastTrak unde= r NT there was horrific FS corruption on the FastTrak stripe when both copy= ing from a disk on the MOBO controller to the stripe on the FastTrak. Hence I swapped the FastTrak to the GigaByte MOBO out of paranoia. I shall check the ATA cabling, and try some other drives that will arrive soon. S=F8ren hinted in Stable yesterday that some IBM drives such as yours ( a= nd coincidentally mine are the same ) <snip> The only drives I can recommed are IBM's, but beware the new DTLA series are so fast that some old controllers can have problems with them. Steve Arild Eiken=E6s Vengen wrote: > Steve Coles wrote: > > > There has been a lot of press that these are the same cards, and I > > seem to remember that FreeBSD treats the FastTrak as just an IDE > > controller, so can anyone enlighten me on the vast speed differential > > between the two: > <snip> > > Summarised Results > > ------------------ > > 1) One drive alone (no ccd) reads and writes at 30 Mb/Sec > > 2) Ultra 100 reads and writes at 29 MB/sec > > 3) FastTrak 100 writes at 50 MB/sec, reads at 48 MB/sec > > > 1) Why is the Ultra so slow ( constructive answers only please :) ? > > The only thing I can think of is that the Ultra 100 isn`t utilizing the > udma/100-channel, and falls back to udma/33, since both reads and write= s > are at 29MB/sec witch is just maxing out the udma/33-standard. When > running my IBM 75GXP off of an udma/33-controller (BX-chipset) I never > get more than 29MB/sec, never 31 or 32MB/sec. > > I seem to remember something about the udma/66-versions from Promise > (both RAID and non-RAID) was the same card (with a different BIOS), but > I thought the udma/100-versions had more differences. > > Arild. > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-hardware" in the body of the message To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
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