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Date: Sat, 03 Jan 2004 15:36:44 -0700 (MST)
Message-Id: <20040103.153644.107852018.imp@bsdimp.com>
To: arch@freebsd.org
From: "M. Warner Losh" <imp@bsdimp.com>
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Subject: Simple patch: Make DFLTPHYS an option
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My brother was talking to me about the problems he was having with
scanners.  Turns out that he needed to incrase DFLTYPHYS to 128k to
make it work.  I'd like to make this a simple option, but wanted to
ask people about it first, for both DFLTPHYS and MAXPHYS.  This would
be an experts only option, since you can do bad things with some
drivers (eg, aha can't do more than 64k of physio at a time, and bad
things may happen if you try > 128k).

The folks on IRC cautioned that this is not for the feign of heart,
since there's 'issues' with physio, MAXPHYS, etc.

Comments?

Warner

P.S.  Here's a trivial patch to implement this:

==== //depot/user/imp/newcard/conf/options#70 - /dell/imp/p4/newcard/src/sys/conf/options ====
@@ -470,10 +470,12 @@
 DEBUG			opt_global.h
 DEBUG_LOCKS		opt_global.h
 DEBUG_VFS_LOCKS		opt_global.h
+DFLTPHYS		opt_global.h
 DIAGNOSTIC		opt_global.h
 INVARIANT_SUPPORT	opt_global.h
 INVARIANTS		opt_global.h
 LOOKUP_SHARED		opt_global.h
+MAXPHYS			opt_global.h
 MCLSHIFT		opt_global.h
 MSIZE			opt_global.h
 REGRESSION		opt_global.h