From mboxrd@z Thu Jan  1 00:00:00 1970
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Subject: Re: [PATCH 3/4] myri10ge - Driver core
Date: Thu, 25 May 2006 17:59:02 +1000
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Cc: Anton Blanchard <anton@samba.org>, netdev@vger.kernel.org,
	gallatin@myri.com, linux-kernel@vger.kernel.org
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To: Brice Goglin <brice@myri.com>
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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.