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Article #942

Re: nbuf=64/128 theory

#942
From: Charles William Swiger
Date: Mon, 09 Nov 1992 01:20
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Excerpts from netnews.comp.sys.next.software: 8-Nov-92 nbuf=64/128
theory by L. Anathea Brooks@wam.um 
> I've changed my boot params using nbuf=128 or rather 
> nbu=128 because of 12 character limit.
>  
> Now, I know this will speed up long compilations, perhaps
> various sorts of number crunching. BUT is there any advantage 
> or speed gain in workaday world? I notice none, and wonder if 
> the memory used by the buffer might be better used as just 
> plain old memory. 

This seems to reduce the amount of drive access done under 3.0 quite
noticably.  It will help during any complex file access activity, such
as compiling, using a database, navigating the filesystem with a
browser, etc.
This will also greatly speed up the floppy drive, once the disk pages
have been loaded into memory.  What you are doing is increasing the
amount of paging activity slightly in order to considerably improve the
disk caching performance of the filesystem.

You may not need to have nbuf set that high is you don't do a lot of
compiles.  As a general rule, try setting nbuf equal to 5% of your real
memory.  For you that would be around 96.

-Chuck


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From: cs4w+@andrew.cmu.edu (Charles William Swiger)
Newsgroups: comp.sys.next.software
Subject: Re: nbuf=64/128 theory
Message-ID: <gezPnky00WBO04CO1Y@andrew.cmu.edu>
Date: 9 Nov 92 01:20:48 GMT
Organization: Senior, Chemistry, Carnegie Mellon, Pittsburgh, PA
Lines: 32
In-Reply-To: <1992Nov8.130418.19237@wam.umd.edu>