Subject: Re: [PATCH v2 4/6] x86: Add clear_page_nocache

From: Andi Kleen <[email-masked]>
Date: Mon, 13 Aug 2012 09:27:53 -0700

> Moving 64 bytes per cycle is faster on Sandy Bridge, but slower on
> Westmere. Any preference? ;)

You have to be careful with these benchmarks.

- You need to make sure the data is cache cold, cache hot is misleading.
- The numbers can change if you have multiple CPUs doing this in parallel.

-Andi