Messages in this thread | | | Date | Thu, 11 Sep 2003 15:28:09 +0100 | From | Dave Jones <> | Subject | Re: [PATCH] 2.6 workaround for Athlon/Opteron prefetch errata |
| |
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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |