Re: [PATCH 3/4] myri10ge - Driver core

Benjamin Herrenschmidt
2006-05-25T07:59:35Z

On Wed, 2006-05-24 at 10:04 +0200, Brice Goglin wrote:

> I am not sure what you mean.
> The only ppc64 with PCI-E that we have seen so far (a G5) couldn't do
> write combining according to Apple.

That is not 100% true.... I don't know what apple had in mind. It also
depends in what slot you are.

Do you have ways to measure the difference ?

Try doing __ioremap(mgp->iomem_base, mgp->board_span, _PAGE_NO_CACHE);
instead of using the normal ioremap for #ifdef powerpc and tell us if it
makes a difference.

Ben.