From: "Martin J. Bligh" <Martin.Bligh@us.ibm.com>
To: jamesclv@us.ibm.com, Marcelo Tosatti <marcelo@conectiva.com.br>
Cc: linux-kernel@vger.kernel.org, Linus Torvalds <torvalds@transmeta.com>
Subject: Re: [PATCH] MAX_MP_BUSSES increase
Date: Tue, 08 Jan 2002 01:41:55 -0800 [thread overview]
Message-ID: <15640000.1010482915@flay> (raw)
In-Reply-To: <200201080914.g089EHq21694@butler1.beaverton.ibm.com>
In-Reply-To: <Pine.LNX.4.21.0112261341470.9842-100000@freak.distro.conectiva> <200201080914.g089EHq21694@butler1.beaverton.ibm.com>
> There's a problem with that -- despite its name, CONFIG_MULTIQUAD is used for
> the old NUMA-Q hardware. It turns on some memory mapped port I/O code that
> doesn't have any purpose for other machines. The PCI bus overflow happens on
> our new Foster-based boxes that may or may not contain multiple quad CPU
> boards.
>
> Still, CONFIG_MULTIQUAD is better than nothing. It just may take a little
> bit of redefinition, so long as we can coax the various distros to build
> their installation and working kernels with CONFIG_MULTIQUAD turned on....
That's not a good idea. You're going to introduce extra switches to every port
IO path, and every IPI (for everybody, not just yourself). CONFIG_MULTIQUAD
is also used to alter the way that PCI config space writes are done (in later
patches). I suggest you use a different config option, or construct it dynamically.
Martin.
next prev parent reply other threads:[~2002-01-08 17:46 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-12-20 4:28 [PATCH] MAX_MP_BUSSES increase James Cleverdon
2001-12-20 5:55 ` Linus Torvalds
2001-12-20 13:07 ` Ingo Molnar
2001-12-20 17:03 ` Andi Kleen
2001-12-20 22:29 ` James Cleverdon
2001-12-20 22:56 ` Andi Kleen
[not found] ` <Pine.LNX.4.33.0112211113570.2196-100000@localhost.localdomain>
2001-12-21 9:14 ` William Lee Irwin III
2001-12-26 15:43 ` Marcelo Tosatti
2002-01-08 9:14 ` James Cleverdon
2002-01-08 9:41 ` Martin J. Bligh [this message]
2002-01-18 21:21 ` James Cleverdon
[not found] <200112210419.fBL4Jfq08533@butler1.beaverton.ibm.com>
[not found] ` <Pine.LNX.4.33.0112211131130.2269-100000@localhost.localdomain>
2001-12-21 11:57 ` William Lee Irwin III
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