Subject: Re: ahc and Semantics of the "COMPLETE" return code
To: Justin T. Gibbs <>
From: Manuel BOUYER <>
List: tech-kern
Date: 06/24/1997 11:23:03
On Jun 23, Justin T. Gibbs wrote
> No, it is a real error.  With 256 S/G segments, you can represent, worst
> case, a 1MB I/O.  Since the kernel can only generate up to 64k I/Os, this
> is a "can't happen" condition (we should only use 17 S/G segments max).
> FreeBSD saw a similar problem perhaps a year and a half ago and it was
> caused by a sign extension bug somewhere. You could ask for
> details since he tracked down and fixed the bug. 

Yes, but the adapter is supposed to be able to handle several I/Os
at the same time, isn't it ? could'nt it run out of S/G segments in this case ?

Manuel Bouyer, LIP6, Universite Paris VI.