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Message-ID: <20090113092409.7e5fbdda@infradead.org> Date: Tue, 13 Jan 2009 09:24:09 +0000 From: Arjan van de Ven <arjan@...radead.org> To: Ingo Molnar <mingo@...e.hu> Cc: linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>, "H. Peter Anvin" <hpa@...or.com> Subject: Re: [PATCH] x86: change the default cache size to 64 bytes On Mon, 12 Jan 2009 23:44:28 +0100 Ingo Molnar <mingo@...e.hu> wrote: > >From 632c5045d6827a3d044b6eb216d0e5597b25d468 Mon Sep 17 00:00:00 > >2001 > From: Ingo Molnar <mingo@...e.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@...e.hu> Acked-by: Arjan van de Ven <arjan@...ux.intel.com> -- Arjan van de Ven Intel Open Source Technology Centre For development, discussion and tips for power savings, visit http://www.lesswatts.org -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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