Date: Mon, 26 May 1997 13:53:05 +0200 From: Stefan Esser <se@FreeBSD.ORG> To: Sxren Schmidt <sos@sos.freebsd.dk> Cc: Bruce Evans <bde@zeta.org.au>, hackers@FreeBSD.ORG, j@uriah.heep.sax.de Subject: Re: Controler for SCSI Message-ID: <19970526135305.44861@x14.mi.uni-koeln.de> In-Reply-To: <199705241107.NAA00317@sos.freebsd.dk>; from S\xren Schmidt on Sat, May 24, 1997 at 01:07:23PM %2B0200 References: <199705241036.UAA02991@godzilla.zeta.org.au> <199705241107.NAA00317@sos.freebsd.dk>
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On May 24, "S\xren Schmidt" <sos@sos.freebsd.dk> wrote: > In reply to Bruce Evans who wrote: > While we are on the subject: I just bought two Maxtor 84000 (4gig) drives > and I plan to play a little with DMA for those (they only do 16.6MB/sec) > They are pretty fast btw, faster than my Empire and SureStore SCSI2 > disks, I'm surprised they even use less CPU than my SCSI setup (above > drives and NCR ctrl), not bad at all and CHEAP!!. While these drives are cheap, no doubt, I'd really see Bonnie numbers, not just sequential throughput. (And BTW: Neither the Empire nor SureStore drives are fast by todays standards, it is not hard to beat them. Compare to my two year old Quantum Atlas, for a fairer test. Those have been sold quite cheap for about one year, and the 1GB version appears to be on sale for some US$210 (+VAT) in Germany, which makes them very attractive for fast CCD arrays :) And another BTW: Since the data transfer for the EIDE drive is mostly done in the interrupt handler, your process just does not get the cycles accounted. Please repeat the tests and monitor total system time and interrupt time ... But I'd also like to have decent bus-master DMA drivers at least for the Triton and Triton II EIDE controllers. I'm thinking about buying one, to be able to test changes to the NCR driver, which I have been holding back for far to long out of fear, my system might become inoperational, and I rely on it for my daily work ... Regards, STefan
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