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Date:      Sat, 29 Jun 1996 11:34:29 +0200 (MET DST)
From:      Wilko Bulte <wilko@yedi.iaf.nl>
To:        cau@cc.gatech.edu (Carlos Ugarte)
Cc:        freebsd-scsi@FreeBSD.ORG, cau@cc.gatech.edu
Subject:   Re: help writing a new SCSI device driver
Message-ID:  <199606290934.LAA01149@yedi.iaf.nl>
In-Reply-To: <199606290407.AAA11695@oscar.cc.gatech.edu> from "Carlos Ugarte" at Jun 29, 96 00:07:34 am

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As Carlos Ugarte wrote...
> 
> Also, I noticed that not all drivers seem to support
> disconnection/reselection.  Is this because it is difficult to
> implement, or because it provides little improvement?  All docs
> I've seen imply that you gain some, but never quantify how
> much...  Is it worth the trouble, if it can be done?

It is definitely a good thing for performance. It allows more
concurrency to happen on the SCSI bus . It takes some thought
to implement it well, so maybe that's the reason not all
drivers have it.

Wilko
_     ____________________________________________________________________
 |   / o / /  _   Wilko Bulte             email: wilko@yedi.iaf.nl
 |/|/ / / /( (_)  Private FreeBSD site  - Arnhem - The Netherlands
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