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Date:      Fri, 03 Mar 1995 21:44:58 -0800
From:      David Greenman <davidg@Root.COM>
To:        "Russell L. Carter" <rcarter@geli.com>
Cc:        current@FreeBSD.org
Subject:   Re: "feel" of recent systems 
Message-ID:  <199503040544.VAA00274@corbin.Root.COM>
In-Reply-To: Your message of "Fri, 03 Mar 95 21:24:06 PST." <199503040524.VAA14072@geli.clusternet> 

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>I wonder if anybody has noticed a tad bit of hesitancy in the system
>since a few days ago.  It has revived a little nostalgia in
>me, since the system I've always thought of as being the very best
>at running heavy loads:  CRI Cray Y-MPs running UNICOS 6.1+, had
>the same feel; could anybody improving the system comment
>on their philosophy for doing these changes?  Does the overall
>system throughput improve?

   There are multiple bugs in several parts of the system that could be
causing your specific problem. The NCR driver has been changing, for instance,
and this might have something to do with it. ...and of course there are the
problems with buffer management/directory caching that we still haven't found
an optimal solution for. We always strive to strike the best balance between
overall performance and responsiveness...but -current isn't production code,
and we make no representations that it is. If you could be more specific
about certain kinds of operations that appear slower, this would help us
find the problems (I saw your Bonnie results...these really aren't very
useful by themselves, however, as they are affected too much by local disk
fragmentation).

-DG



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