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From: mf@ircam.ircam.fr (Michel Fingerhut)
Newsgroups: comp.unix.ultrix,comp.sys.dec
Subject: DECsystem 5800 with 2 processors slower than with 1?
Message-ID: <1990Sep26.151338.14480@ircam.ircam.fr>
Date: 26 Sep 90 15:13:38 GMT
Sender: mf@ircam.ircam.fr (Michel Fingerhut)
Organization: IRCAM, Paris (France)
Lines: 12

We noticed a significant slow-down of our 5820 (bi-processor 5800) in
response time after upgrading from Ultrix 3.1 (which supports a single
processor) to Ultrix 4.0 (whose "kernel has been enhanced to support
multiple processors executing kernel code").

The local DEC support's reply to my call was that it was a known
"problem" and their advice was to turn off the  2nd CPU until a fix is
found.

I did this, and lo and behold, "ls" runs so much faster... I wonder if by
turning the remaining CPU off I'll get the computing power DEC claims for
the DS5820.