From: Paul Mackerras <paulus@samba.org>
To: Andrew Morton <akpm@osdl.org>
Cc: Andi Kleen <ak@suse.de>,
"Eric W. Biederman" <ebiederm@xmission.com>,
"Randy.Dunlap" <rdunlap@xenotime.net>,
"Protasevich, Natalie" <Natalie.Protasevich@unisys.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] x86_64: Make NR_IRQS configurable in Kconfig
Date: Tue, 8 Aug 2006 15:09:34 +1000 [thread overview]
Message-ID: <17624.7310.856480.704542@cargo.ozlabs.ibm.com> (raw)
In-Reply-To: <20060807194159.f7c741b5.akpm@osdl.org>
Andrew Morton writes:
> > Drawback would be some more TLB misses.
>
> yup. On some (important) architectures - I'm not sure which architectures
> do the bigpage-for-kernel trick.
I looked at optimizing the per-cpu data accessors on PowerPC and only
ever saw fractions of a percent change in overall performance, which
says to me that we don't actually use per-cpu data all that much. So
unless you make per-cpu data really really slow, I doubt that we'll
see any significant performance difference.
Paul.
next prev parent reply other threads:[~2006-08-08 5:10 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
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 ` Paul Mackerras [this message]
2006-08-08 5:14 ` [PATCH] x86_64: Make NR_IRQS configurable in Kconfig 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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