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Message-ID: <20091109185434.GH26740@basil.fritz.box>
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.
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