*BSD News Article 6950


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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.