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Date:      Mon, 29 Nov 1999 18:10:23 -0500 (EST)
From:      Larry Baird <lab@gta.com>
To:        freebsd-small@freebsd.org
Subject:   Re: md - memory disk wishlist ?
Message-ID:  <199911292310.SAA88340@gta.com>
In-Reply-To: <23112.943907996@critter.freebsd.dk>

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In article <23112.943907996@critter.freebsd.dk> you wrote:

> I'm looking for input from this crowd: what features do you want to
> see from the md driver ?

> Currently it supports two modes of operation:

> 	1. Preloaded images.  This is like MFS_ROOT basically, 
> 	   but you can muliple images and get multiple devices.
Can you shed a little bit of light on how md(4) works as compared
to MFS_ROOT?  Is there some documentation somewhere that I missed?
Is there a utility similar to write_mfs_in_kernel?

> 	2. Malloc mode.  Here storage is malloc(9)'ed on as needed
> 	   basis and freed back when possible (with UFS for instance).
> 	   Simple compression is performed:  if a sector have all bytes
> 	   identical no storage will be alocated, only that byte value
> 	   will be stored.
Does malloc mode also apply to preloaded images?

> I would like to hear from the embedded people what you need from a
> memory device driver in FreeBSD in the future.
I'll give this some thought.


-- 
------------------------------------------------------------------------
Larry Baird                             
Global Technology Associates, Inc. | Orlando, FL
Email: lab@gta.com                 | TEL 407-380-0220, FAX 407-380-6080


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