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SubjectRe: [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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