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- Newsgroups: comp.sys.ibm.pc.hardware
- Path: sparky!uunet!hobbes!md
- From: md@sco.COM (Michael Davidson)
- Subject: Re: Concurrent Processors on EISA Bus?
- Organization: The Santa Cruz Operation, Inc.
- Date: Fri, 18 Dec 1992 17:45:21 GMT
- Message-ID: <1992Dec18.174521.1128@sco.com>
- References: <1992Dec17.154240.1@sscvx1.ssc.gov>
- Sender: news@sco.com (News admin)
- Lines: 29
-
-
- schludermann@sscvx1.ssc.gov writes:
-
- >If the EISA bus is a Trully multiprocessor design, Does this mean that
- >concurent processing is possible?
-
- I'm not sure what you mean by the question .....
-
- By "concurrent processing" do you mean "multi-processor"?
-
- If so, please remember that the EISA bus was designed as an
- i/o bus to replace the old PC-AT i/o bus (now called the "ISA" bus)
- and to compete with the MCA bus. It was *not* designed as a
- processor / memory interconnect bus for multi-processor machines.
- While you *could* in certain circumstances put additional
- processors out on the EISA bus, you would be insane to do it if
- what you wanted to end up with was a tightly coupled symmetric
- shared memory multi-processor machine - the bus just wasn't
- designed for that.
-
- You can, of course, attach an EISA bus to a multiprocessor
- machine as the i/o bus - there are lots of examples of this,
- probably the best known being the Compaq SystemPro. Whether the
- system is symmetric with regard to the i/o bus (ie can all of
- the processors access the i/o bus equally) is really an issue
- for the multiprocessor implementation rather than the i/o bus
- itself.
-
-
-