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Date:      Mon, 22 Mar 2010 12:40:18 +0100
From:      Gary Jennejohn <gary.jennejohn@freenet.de>
To:        Alexander Motin <mav@FreeBSD.org>
Cc:        Scott Long <scottl@samsco.org>, FreeBSD-Current <freebsd-current@freebsd.org>, freebsd-arch@freebsd.org
Subject:   Re: Increasing MAXPHYS
Message-ID:  <20100322124018.7430f45e@ernst.jennejohn.org>
In-Reply-To: <4BA6517C.3050509@FreeBSD.org>
References:  <4BA4E7A9.3070502@FreeBSD.org> <201003201753.o2KHrH5x003946@apollo.backplane.com> <891E2580-8DE3-4B82-81C4-F2C07735A854@samsco.org> <4BA52179.9030903@FreeBSD.org> <39C5864C-8A6B-4137-8743-D7B9F30F5939@samsco.org> <4BA6517C.3050509@FreeBSD.org>

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On Sun, 21 Mar 2010 19:03:56 +0200
Alexander Motin <mav@FreeBSD.org> wrote:

> Scott Long wrote:
> > Are there non-CAM drivers that look at MAXPHYS, or that silently assume that
> > MAXPHYS will never be more than 128k?
> 
> That is a question.
> 

I only did a quick&dirty grep looking for MAXPHYS in /sys.

Some drivers redefine MAXPHYS to be 512KiB.  Some use their own local
MAXPHYS which is usually 128KiB.

Some look at MAXPHYS to figure out other things; the details escape me.

There's one driver which actually uses 100*MAXPHYS for something, but I
didn't check the details.

Lots of them were non-CAM drivers AFAICT.

--
Gary Jennejohn



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