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

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Message-ID: <20080325161901.GF27174@elte.hu>
Date:	Tue, 25 Mar 2008 17:19:06 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Alan Mayer <ajm@....com>
Cc:	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


* 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
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