linux-kernel - Re: Loss of PAT-WC after resume on i5

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Date:	Mon, 03 Jan 2011 16:21:09 +0000
From:	Chris Wilson <chris@...is-wilson.co.uk>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	linux-kernel@...r.kernel.org,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	Venkatesh Pallipadi <venki@...gle.com>
Subject: Re: Loss of PAT-WC after resume on i5

On Mon, 03 Jan 2011 08:01:05 -0800, "H. Peter Anvin" <hpa@...or.com> wrote:
> Sounds like it.  It sounds based on your description that it's something
> more fundamental than just the state of the PAT MSR being lost, too,
> although perhaps that's the first thing to check...

Right, I should have mentioned that a rdmsr(MSR_ISA32_CR_PAT) showed no
change across a dysfunctional resume. And that
/sys/kernel/debug/x86/pat_memtype_list had the same contents (just the
first entries reversed upon resume).
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
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