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To: "Jamil J. Weatherbee" <jamil@trojanhorse.ml.org>
cc: hackers@freebsd.org, dufault@hda.com
Subject: Re: Strategy Routines 
In-reply-to: Your message of "Sat, 01 Nov 1997 21:36:30 -0800."
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Date: Sun, 02 Nov 1997 16:18:53 +1030
From: Mike Smith <mike@smith.net.au>
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(Peter, are you on -hackers?)

> Ok, so say I am doing outb(), one bang after the other. Since timo can
> sleep up to 1/100 of a second. What would be a good "packet size" (i.e.
> number of outb() to limit myself to in a loop.

I still have to wonder why you would want to do this in the first 
place.  However I'd take two separate approaches:

 - sequenced output, use tsleep() between output values.
 - fast output, limit yourself to N bytes of output, then return from 
   the write() call with a short count.

No timeouts, no sleeping, no blocking for unreasonable periods.  I'd 
perhaps limit to 512 bytes per write.

mike