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Newsgroups: comp.unix.bsd Path: sserve!manuel.anu.edu.au!munnari.oz.au!spool.mu.edu!uwm.edu!cs.utexas.edu!sdd.hp.com!zaphod.mps.ohio-state.edu!caen!uunet!mcrware!adam From: adam@microware.com (Adam Goldberg) Subject: Re: ISA is faster than EISA ? (Was: Re: DOS and 386BSD (and NT and OS2)) Message-ID: <1992Oct23.140133.29341@microware.com> Sender: news@microware.com Nntp-Posting-Host: ren Organization: Microware Systems Corp., Des Moines, Iowa References: <1992Oct16.175743.19250@fcom.cc.utah.edu> <1992Oct21.160231.6516@ntuix.ntu.ac.sg> <1992Oct22.093459.13824@autelca.ascom.ch> <BwIwu4.Mx6@pix.com> Date: Fri, 23 Oct 1992 14:01:33 GMT Lines: 50 stripes@pix.com (Josh Osborne) writes: >In article <1992Oct22.093459.13824@autelca.ascom.ch> nbladt@autelca.ascom.ch (Norbert Bladt) writes: >>This must be wrong ! >>The DMA rate on the ISA bus is about 5 (or 5.7) MB/sec. while on the EISA >>bus it is (up to) 33MB/sec. Quite a difference in my opinion. >You would be lucky to find a disk that did more then 1M/second. >Of corse, since the video is also on that bus, and video tends to suck >tons of bandwidth, having an EISA bus may make your disks seem faster >because there is more bandwidth to share... My system: Adaptec 1540 Quantum LPS-series HD (210MB, or so) 386-25, 64k cache (Gateway) OS-9000 operating system ISA Bus. My results: (Calvin)/h0/USR/ADAM:timeio -r -b=200k -f=/h0@ -n=10 Timing how long it takes to read /h0@ (204800 bytes) 9:45:33 - 9:45:33 (0.16 seconds), 1280000 bytes/second 9:45:33 - 9:45:33 (0.13 seconds), 1575384 bytes/second 9:45:33 - 9:45:33 (0.13 seconds), 1575384 bytes/second 9:45:33 - 9:45:33 (0.12 seconds), 1706666 bytes/second 9:45:33 - 9:45:34 (0.13 seconds), 1575384 bytes/second 9:45:34 - 9:45:34 (0.12 seconds), 1706666 bytes/second 9:45:34 - 9:45:34 (0.13 seconds), 1575384 bytes/second 9:45:34 - 9:45:34 (0.12 seconds), 1706666 bytes/second 9:45:34 - 9:45:34 (0.13 seconds), 1575384 bytes/second 9:45:34 - 9:45:34 (0.12 seconds), 1706666 bytes/second (Calvin)/h0/USR/ADAM: For an average of 1.76MB/second. Once upon a time, I hooked the same drive up to a Compaq 486/33M (EISA) with an Adaptec 1740 and got transfer rates in the neighborhood of 7 MB/second. You don't need to buy a house for high transfer--you need an OS which allows synchronous SCSI transfers. -- Adam G. adamg@microware.com, or ...!uunet!mcrware!adamg The above is not to be construed in any way as the official or unofficial statements of Microware, or any Microware employees.