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From: jap@convex.cl.msu.edu (Joe Porkka)
Newsgroups: comp.sys.amiga.misc
Subject: Re: Need info on addbuffers
Keywords: I did RTM
Message-ID: <1991Mar20.174425.20537@msuinfo.cl.msu.edu>
Date: 20 Mar 91 17:44:25 GMT
References: <1211@caslon.cs.arizona.edu>
Sender: news@msuinfo.cl.msu.edu
Organization: Michigan State University
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dave@cs.arizona.edu (Dave Schaumann) writes:

>Can someone please tell me some more info on addbuffers (or point me to where
>I could find it?)

>Specifically:
>   1.	the name would imply that it is a cumulative operation.  Ie, that
Yes it is. Under 2.x you can even "AddBuffers df0: -10" to remove buffers

>   2.   What is the default # of buffers you get without any "addbuffers"
>	call at all?
Depends on the device. Default for floppies is 5. "mount"ed devices
and harddrives may have a different default.

>I was just reading my 1.3 enhancer guide (or whatever it's called) last night,
>and saw where it says having 25-30 buffers really speeds up disk performance.

Yes it makes a big difference.

As to the number of buffers, it depends on what filesystem you are using.
For a floppy drive using the OldFileSystem ( which you are doing),
then 25-30 buffers is about right. I have not benchmarked things to
see if more buffers helps, but it does not seem to help much.

With a hard disk and the FastFileSystem, generally the more
buffers the better.