From: "H. Peter Anvin" <hpa@zytor.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: "Randy.Dunlap" <rdunlap@xenotime.net>,
Andrew Morton <akpm@osdl.org>, Andi Kleen <ak@suse.de>,
"Protasevich, Natalie" <Natalie.Protasevich@UNISYS.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] x86_64: Make NR_IRQS configurable in Kconfig
Date: Mon, 07 Aug 2006 10:00:23 -0700 [thread overview]
Message-ID: <44D771A7.7040605@zytor.com> (raw)
In-Reply-To: <m1irl4ebsf.fsf@ebiederm.dsl.xmission.com>
Eric W. Biederman wrote:
>
> a) Because I would like to flush out bugs.
> b) Because I want a default that works for everyone.
> c) Because with MSI we have a potential for large irq counts on most systems.
> d) Because anyone who disagrees with me can send a patch and fix
> the default.
> e) Because with the default number of cpus we can very close to needing
> this many irqs in the worst case.
> f) This is much better than previous to my patch and setting NR_CPUS=255
> and getting 8K IRQS.
> g) Because I probably should have been more inventive than copying the
> NR_IRQS text, but when I did the wording sounded ok to me.
>
Why not simply reserve 224*NR_CPUS IRQs? If you have 256 CPUs allocating
64K IRQs should hardly matter :)
-hpa
next prev parent reply other threads:[~2006-08-07 17:00 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
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 [this message]
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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