From: Arjan van de Ven <arjan@infradead.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH] x86: change the default cache size to 64 bytes
Date: Tue, 13 Jan 2009 09:24:09 +0000 [thread overview]
Message-ID: <20090113092409.7e5fbdda@infradead.org> (raw)
In-Reply-To: <20090112224428.GA18090@elte.hu>
On Mon, 12 Jan 2009 23:44:28 +0100
Ingo Molnar <mingo@elte.hu> wrote:
> >From 632c5045d6827a3d044b6eb216d0e5597b25d468 Mon Sep 17 00:00:00
> >2001
> From: Ingo Molnar <mingo@elte.hu>
> Date: Mon, 12 Jan 2009 23:37:16 +0100
> Subject: [PATCH] x86: change the default cache size to 64 bytes
>
> Right now the generic cacheline size is 128 bytes - that is wasteful
> when structures are aligned, as all modern x86 CPUs have an
> (effective) cacheline sizes of 64 bytes.
>
> It was set to 128 bytes due to some cacheline aliasing problems on
> older P4 systems, but those are many years old and we dont optimize
> for them anymore. (They'll still get the 128 bytes cacheline size if
> the kernel is specifically built for Pentium 4)
>
> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Arjan van de Ven <arjan@linux.intel.com>
--
Arjan van de Ven Intel Open Source Technology Centre
For development, discussion and tips for power savings,
visit http://www.lesswatts.org
prev parent reply other threads:[~2009-01-13 9:22 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-12 22:44 [PATCH] x86: change the default cache size to 64 bytes Ingo Molnar
2009-01-13 9:24 ` Arjan van de Ven [this message]
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