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Date:      Mon, 16 Apr 2001 10:40:44 -0600
From:      "Justin T. Gibbs" <gibbs@scsiguy.com>
To:        Alessandro de Manzano <ale@unixmania.net>
Cc:        scsi@FreeBSD.ORG, questions@FreeBSD.ORG
Subject:   Re: memory mapped I/O on adaptec ? 
Message-ID:  <200104161641.f3GGeis11580@aslan.scsiguy.com>
In-Reply-To: Your message of "Sat, 14 Apr 2001 22:47:07 %2B0200." <20010414224707.C42900@libero.sunshine.ale> 

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>Hi!
>
>I've just noticed in LINT the "AHC_ALLOW_MEMIO" option, and I wonder
>how much this setting would speed the Adaptec controllers.

It depends on how saturated your PCI bus.  The MEMIO option avoids some
processor stalling when the PCI bus is not very idle.  You would likely
see a decrease in system time, not an increase in performance.

>LINT says also that it's not default because does not work on some
>motherboards. There is maybe a list of these of something ? Trying is
>the only option I've to know if it will work on my motherboards ? :-)

You will know almost instantly if it doesn't work.  The controller will
freeze up.

--
Justin

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