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Path: sserve!newshost.anu.edu.au!harbinger.cc.monash.edu.au!yarrina.connect.com.au!classic.iinet.com.au!news.uoknor.edu!news.ecn.uoknor.edu!paladin.american.edu!gatech!news.sprintlink.net!sunserver.insinc.net!news.Direct.CA!cynic.portal.ca!curt From: curt@cynic.portal.ca (Curt Sampson) Newsgroups: comp.unix.bsd.netbsd.misc Subject: Re: Commerical OS's (was Re: aha0: DMA beyond end of ISA) Date: 19 May 1995 16:19:41 GMT Organization: Internet Portal Services, Ltd. Lines: 25 Message-ID: <3piget$4i2@stud.Direct.CA> References: <MICHAELV.95May12222703@MindBender.HeadCandy.com> <3pc8u8$66g@news.cloud9.net> <3pd7s5$6i9@shell1.best.com> <3pfcne$ab6@news.rrz.uni-koeln.de> NNTP-Posting-Host: cynic.portal.ca In article <3pfcne$ab6@news.rrz.uni-koeln.de>, Stefan Esser <se@MI.Uni-Koeln.DE> wrote: >Well, and I just checked the maximum command rate >(i.e. used "dd if=/dev/rsd0a of=/dev/null bs=512" >to do minimum size transfers). > >I got some 1600 transfers/s using my Quantum Atlas >connected to a NCR 53c810 and driven by an 486/66. > >I'd like to know the number of 512 byte reads per >second of other controllers. I think this may well depend a lot on the drive. I've got a pair of Quantum Lightning drives (340 and 530 MB) on a PCI NCR53c810 driven by a 486/66, and I get a hair over 600 transfers per second. I calculate this by divding the number of blocks transferred by the number of seconds it took (according to dd). cjs -- Curt Sampson curt@portal.ca Internet Portal Services, Ltd. Beside the willow'd river bank Vancouver, BC (604) 257-9400 Repose I, still and thinking...