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Date: Mon, 09 Nov 2009 14:36:57 -0800 From: "H. Peter Anvin" <hpa@...or.com> To: Andi Kleen <andi@...stfloor.org> CC: "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. On 11/09/2009 10:54 AM, Andi Kleen wrote: >> 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. Well, if you have concrete information about what the problem cases are, then please provide it. If you don't, but have a hunch where these potential problems may lie, then please indicate what they might be. Otherwise, there isn't any actionable information here. -hpa -- 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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