Re: CPA patchset

Ingo Molnar
2008-01-10T10:05:30Z

* Andi Kleen <ak@suse.de> wrote:

> > WBINVD isnt particular fast (takes a few msecs), but why is that a
> > problem? Drivers dont do high-frequency ioremap-ing. It's
> > typically only done at driver/device startup and that's it.
>
> Actually graphics drivers can do higher frequency allocation of WC
> memory (with PAT) support.

but that's not too smart: why dont they use WB plus cflush instead?
ioremap() will always be slow and we dont care about stupid uses of it.

Ingo