linux-kernel - Re: [RFC Patch] use MTRR for write combining if PAT is not available

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Date:	Sat, 10 Oct 2009 08:45:03 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Thomas Schlichter <thomas.schlichter@....de>
CC:	linux-kernel@...r.kernel.org,
	Thomas Hellstrom <thellstrom@...are.com>
Subject: Re: [RFC Patch] use MTRR for write combining if PAT is not available

Thomas Schlichter wrote:

> Hmm, my CPU (VIA Nano) seems to support PAT, but Ubuntu disables this
> feature in its kernel config. I'm using 9.04, but even 9.10 will have PAT
> disabled:

that sounds like a bad idea. But to each distro their own I suppose.


> 
> http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-
> karmic.git;a=blob;f=debian.master/config/config.common.ubuntu;h=a43cbabd02bfdf5412de6fea232db86aa5d3e742;hb=HEAD

> So, convincing Ubuntu to enable PAT would be a workaround, but I think
> the problem would still exist and should be fixed.

I think it's time to get rid of CONFIG_PAT at all.. and just have it be there.
Making 10+ year old CPU features that are essential functionality a config option...
... not a good idea to be honest.
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