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Message-ID: <20081011080812.GA9880@one.firstfloor.org> Date: Sat, 11 Oct 2008 10:08:12 +0200 From: Andi Kleen <andi@...stfloor.org> To: Nick Piggin <nickpiggin@...oo.com.au> Cc: Andi Kleen <andi@...stfloor.org>, Dave Jones <davej@...hat.com>, x86@...nel.org, Linux Kernel <linux-kernel@...r.kernel.org> Subject: Re: Update cacheline size on X86_GENERIC > I guess there is a reasonable argument to not care about P4 so I don't think it is. Ignoring old systems would be a mistake and the wrong signal. One of Linux's forte over the competition was always to run reasonable on older systems too. There are millions and millions of P4s around. And they're not that old, they're still shipping in fact. And the point of GENERIC was to be a reasonable default on all systems. If you want to optimize for a specific CPU you're always free to compile the kernel for that. But GENERIC should be really GENERIC. > much in today's GENERIC kernel. If it is worth around 1% on tpc > on a more modern architecture, that is a pretty big motivation > to change it too... TPC is a extreme case, it is extremly cache bound. Besides I suspect the TPC issue could be fixed with a minimal tweaks without breaking other systems. -Andi -- ak@...ux.intel.com -- 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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