From: Andi Kleen <ak@suse.de>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Andrew Morton <akpm@osdl.org>,
"Protasevich, Natalie" <Natalie.Protasevich@unisys.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] x86_64: Make NR_IRQS configurable in Kconfig
Date: Mon, 7 Aug 2006 17:33:13 +0200 [thread overview]
Message-ID: <200608071733.13562.ak@suse.de> (raw)
In-Reply-To: <m1irl4ftya.fsf@ebiederm.dsl.xmission.com>
On Monday 07 August 2006 17:26, Eric W. Biederman wrote:
>
> Currrently on a SMP system we can theoretically support
> NR_CPUS*224 irqs. Unfortunately our data structures
> don't cope will with that many irqs, nor does hardware
> typically provide that many irq sources.
>
> With the number of cores starting to follow Moores
> law, and the apicid limits being raised beyond an 8bit
> number trying to track our current maximum with our
> current data structures would be fatal and wasteful.
>
> So this patch decouples the number of irqs we support
> from the number of cpus. We can revisit this decision
> once someone reworks the current data structures.
Ok. I was about to apply it, but it seems to require
mm patches right now, so i didn't
-Andi
next prev parent reply other threads:[~2006-08-07 15:33 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-07 15:26 [PATCH] x86_64: Make NR_IRQS configurable in Kconfig Eric W. Biederman
2006-08-07 15:33 ` Andi Kleen [this message]
2006-08-07 15:55 ` Eric W. Biederman
2006-08-07 15:59 ` Randy.Dunlap
2006-08-07 16:11 ` Protasevich, Natalie
2006-08-07 16:17 ` Andi Kleen
2006-08-07 16:23 ` Protasevich, Natalie
2006-08-07 16:58 ` Eric W. Biederman
2006-08-07 16:44 ` Eric W. Biederman
2006-08-07 17:00 ` H. Peter Anvin
2006-08-07 17:46 ` Eric W. Biederman
2006-08-07 17:52 ` H. Peter Anvin
2006-08-07 17:30 ` Eric W. Biederman
2006-08-07 17:55 ` Randy.Dunlap
2006-08-07 18:16 ` Eric W. Biederman
2006-08-07 18:53 ` Eric W. Biederman
2006-08-07 19:04 ` Randy.Dunlap
2006-08-07 22:10 ` Eric W. Biederman
2006-08-07 23:55 ` Andrew Morton
2006-08-08 2:17 ` Andi Kleen
2006-08-08 2:41 ` Andrew Morton
2006-08-08 2:47 ` Arjan van de Ven
2006-08-08 5:47 ` [PATCH] x86_64: Auto size the per cpu area Eric W. Biederman
2006-08-08 6:01 ` Andrew Morton
2006-08-08 6:31 ` Eric W. Biederman
2006-08-08 6:01 ` Andi Kleen
2006-08-08 6:46 ` Eric W. Biederman
2006-08-08 6:48 ` Andi Kleen
2006-08-08 7:29 ` Eric W. Biederman
2006-08-08 5:09 ` [PATCH] x86_64: Make NR_IRQS configurable in Kconfig Paul Mackerras
2006-08-08 5:14 ` Andi Kleen
2006-08-08 8:17 ` Martin Schwidefsky
2006-08-09 17:58 ` Luck, Tony
2006-08-09 18:25 ` Dave Hansen
2006-08-10 12:55 ` Martin Schwidefsky
2006-08-10 14:40 ` Andy Whitcroft
2006-08-10 14:53 ` Martin Schwidefsky
2006-08-07 19:40 ` Adrian Bunk
2006-08-07 22:26 ` Eric W. Biederman
2006-08-07 23:06 ` Adrian Bunk
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