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Date: Mon, 9 Nov 2009 19:54:34 +0100 From: Andi Kleen <andi@...stfloor.org> To: "H. Peter Anvin" <hpa@...or.com> Cc: Andi Kleen <andi@...stfloor.org>, "Ma, Ling" <ling.ma@...el.com>, Ingo Molnar <mingo@...hat.com>, Thomas Gleixner <tglx@...utronix.de>, linux-kernel <linux-kernel@...r.kernel.org> Subject: Re: [PATCH RFC] [X86] performance improvement for memcpy_64.S by fast string. > Ling's numbers didn't seem to show a significant slowdown on Core 2 (it > was something like 0.95x baseline in the worst case, and most of the > cases were positive) so Core 2 doesn't seem to have a problem. I ran quite a lot of micro benchmarks with various alignments and sizes the 'q' variant was not always a win. I haven't checked that particular version though. There's also K8 of course. -Andi -- ak@...ux.intel.com -- Speaking for myself only. -- 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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