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Date: Thu, 23 Jun 2011 04:29:11 +0200 From: Andi Kleen <andi@...stfloor.org> To: "Ma, Ling" <ling.ma@...el.com> Cc: Andi Kleen <andi@...stfloor.org>, "mingo@...e.hu" <mingo@...e.hu>, "hpa@...or.com" <hpa@...or.com>, "tglx@...utronix.de" <tglx@...utronix.de>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: [PATCH RFC] [x86] Optimize copy-page by reducing impact from HW prefetch On Thu, Jun 23, 2011 at 09:01:19AM +0800, Ma, Ling wrote: > Yes, I also have tested 64bit atom, it got 11.6% improvement. That's a nice improvement, however I should add that in my experience copy_page micro benchmark improvements do not necessarily translate to real world improvements. Most simple micro benchmark do not simulate the typical page fault access pattern very well. > Because older CPU almost all use prefetch-next-line mechanism, the patch should be useful to them. Old in this case is P4 and ancient early stepping K8 only. -Andi -- 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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