Re: [PATCH] remove dead cyrix/centaur mtrr init code

Alan Cox
2005-03-03T12:09:40Z

On Mer, 2005-03-02 at 22:28, Dave Jones wrote:
> The winchips had a funky feature where you could mark system ram
> writes as out-of-order. This led to something like a 25% speedup iirc
> on benchmarks that did lots of memory copying. lmbench showed
> significant wins iirc, but any results I had saved are long since
> wiped out in hard disk failures/cruft removal over the years.

Yep - providing your kernel is built for it you get about 20-30% speed
up against a base kernel. It's the one freak case (in 2.4 anyway) where
kernel cpu options matter.

Alan