linux-kernel - Re: [PATCH] x86_64: Restore the proper NR

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Date:	Sat, 02 Aug 2008 23:35:42 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"Yinghai Lu" <yhlu.kernel@...il.com>
Cc:	"Jeremy Fitzhardinge" <jeremy@...p.org>,
	"H. Peter Anvin" <hpa@...or.com>, "Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Dhaval Giani" <dhaval@...ux.vnet.ibm.com>,
	"Mike Travis" <travis@....com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86_64: Restore the proper NR_IRQS define so larger systems work.

"Yinghai Lu" <yhlu.kernel@...il.com> writes:


> what should xen pv 64 get for NR_IRQS?

Xen pv 64 will work at least as well with a larger definition for
NR_IRQS as it will work with a smaller definition, and since
NR_VECTORS is 256 we always have more irqs with the 32bit definition
we were mistakenly using. 

Xen has 1024 event channels so I expect 1024 would the nice number to
provide there.

Eric

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