linux-kernel - Re: [RFC] killing the NR

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Date:	Fri, 16 Feb 2007 11:06:56 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <ak@...e.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ingo Molnar <mingo@...e.hu>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [RFC] killing the NR_IRQS arrays.

Eric W. Biederman wrote:
> Well you shouldn't need to wait just run with a kernel with NR_IRQS >= 1024.
> 1024 is stretch but it isn't to bad.  There are already x86 boxes that have
> more pins on their ioapics then that. So x86_64 and with this latest
> round of patches from Len Brown and I i386 should be able to support that.
>   

Early Xen patches did just that, but there was general criticism about
the memory use.  And in the paravirt_ops world, a large compile-time
static allocation is not really acceptable if its only needed by Xen. 
But, hey, if you're OK with it I'll submit the patch ;)

> On the other side 1024 looks extremely limiting for exposing pci devices.  
> If someone gets serious about pushing what is legal with MSI-X you may be
> in trouble.  As a single device is allowed to have 4096 interrupts.   Not
> that I can think of a user for so many but...
>   

No, I think we'll burn that bridge when we come to it.

    J
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