linux-kernel - Re: [PATCH] x86_64: resize NR

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Message-ID: <Pine.SGI.3.96.1080325112342.7873204V-100000@fergus.americas.sgi.com>
Date:	Tue, 25 Mar 2008 11:24:04 -0500 (CDT)
From:	Alan Mayer <ajm@....com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Alan Mayer <ajm@....com>, torvalds@...ux-foundation.org,
	linux-kernel list <linux-kernel@...r.kernel.org>,
	Robin Holt <holt@....com>, Jack Steiner <steiner@....com>,
	Russ Anderson <rja@....com>
Subject: Re: [PATCH] x86_64: resize NR_IRQS for large machines

On Tue, 25 Mar 2008, Ingo Molnar wrote:

> 
> * Alan Mayer <ajm@....com> wrote:
> 
> > Subject: [PATCH] x86_64: resize NR_IRQS for large machines
> > 
> > From: Alan Mayer <ajm@....com>
> > 
> > On machines with very large numbers of cpus, tables that are 
> > dimensioned by NR_IRQS get very large, especially the irq_desc table.  
> > They are also very sparsely used.  When the cpu count is > 
> > MAX_IO_APICS, use MAX_IO_APICS to set NR_IRQS, otherwise use NR_CPUS.
> > 
> > Signed-off-by: Alan Mayer <ajm@....com>
> > Reviewed-by: Christoph Lameter <clameter@....com>
> 
> thanks, applied. I suspect this can wait until .26, as there appears to 
> be a number of other patches that you need to get these boxes running on 
> vanilla, right?
> 
> 	Ingo

That's right.  Thanks.

		--ajm

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