Re: [PATCH] 2.6 workaround for Athlon/Opteron prefetch errata

Dave Jones
2003-09-11T14:29:26Z

On Thu, Sep 11, 2003 at 04:24:21PM +0200, Andi Kleen wrote:
> I considered that when writing the patch, but: is_prefetch is a single byte
> memory access for something already in cache. Checking for an Athlon
> CPU needs two memory accesses in boot_cpu_data at least (checking vendor
> and model)

You only need to check it once when the path is first taken, and then
set a variable that makes you exit as soon as you enter it again.

Dave

--
Dave Jones http://www.codemonkey.org.uk