linux-kernel - Re: MTRR initialization

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Message-Id: <200709201008.53728.jbarnes@virtuousgeek.org>
Date:	Thu, 20 Sep 2007 10:08:53 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Jesse Barnes <jesse.barnes@...el.com>, Howard Chu <hyc@...as.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: MTRR initialization

On Thursday, September 20, 2007, Jesse Barnes wrote:
> On Wednesday, September 19, 2007 11:50:23 pm Andi Kleen wrote:
> > Jesse Barnes <jesse.barnes@...el.com> writes:
> > > To do this in a nicer way (and be less vulnerable to similar BIOS
> > > funkiness) the kernel really needs full PAT support.  That should
> > > allow WC over WB and WC over UC mappings to occur, at least if
> > > I'm remembering the docs right...
> >
> > PAT only really helps for device driver performance optimizations.
> > But if the basic WB MTRRs are wrong PAT cannot really salvage it.
>
> Look at the original bug report.  There's a bug WB region so any
                                              ^^^
                                          err big
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