Date: Thu, 18 Sep 1997 07:46:11 -0600 From: "Justin T. Gibbs" <gibbs@plutotech.com> To: stesin@gu.net Cc: "Justin T. Gibbs" <gibbs@plutotech.com>, John-Mark Gurney <gurney_j@resnet.uoregon.edu>, Zach Heilig <zach@gaffaneys.com>, scsi@FreeBSD.ORG Subject: Re: PCI Advansys controller... Message-ID: <199709181346.HAA00715@pluto.plutotech.com> In-Reply-To: Your message of "Thu, 18 Sep 1997 11:45:04 %2B0300." <Pine.BSF.3.96.970918114255.9131E-100000@trifork.gu.net>
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>On Wed, 17 Sep 1997, Justin T. Gibbs wrote: > >> I haven't done any side by side benchmarks between the two cards, but the >> architecture that the AdvanSys cards use doesn't strike me as really >> high performance. > > Back in 1994 I did have some experience with PCI Advansys > SCSI controllers, under SCO UNIX. They were noticeable > slower than any of NCR 53c810 and Adaptec 2940. > >Best regards, >Andrew Stesin If you had one of the early AdvanSys controllers, the latency timer is explicitly set to 0 to get around a bug. This, above and beyond the architecture used to talk to the cards, really kills performance. It was corrected in Rev C and higher of the non-ultra Asc1200 chips and is not a problem in the Ultra line. -- Justin T. Gibbs =========================================== FreeBSD: Turning PCs into workstations ===========================================
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