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From: keith@richard.csc.ti.com (Keith Sparacin)
Newsgroups: comp.unix.sysv386
Subject: I/O access vs. Memory access
Message-ID: <KEITH.91Jan18131612@richard.csc.ti.com>
Date: 18 Jan 91 19:16:12 GMT
Sender: usenet@csc.ti.com (USENET News System)
Distribution: comp
Organization: TI Computer Science Center, Dallas
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Are there performance problems related to accessing i/o memory vs.
non-i/o memory on Intel based computers running Unix?  Rumor has it that
i/o accesses take longer than memory accesses due to memory protection
schemes.  Can anyone provide any information on this subject?  Thanks.

Keith Sparacin      (keith@csc.ti.com)
Texas Instruments