linux-kernel - Re: patch disabling use of PSE on Atom CPUs with a certain erratum

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Message-Id: <4CADEED9020000780001B44F@vpn.id2.novell.com>
Date:	Thu, 07 Oct 2010 15:01:29 +0100
From:	"Jan Beulich" <JBeulich@...ell.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	<linux-kernel@...r.kernel.org>
Subject: Re: patch disabling use of PSE on Atom CPUs with a certain
	 erratum

>>> On 07.10.10 at 15:46, "H. Peter Anvin" <hpa@...or.com> wrote:
> On 10/07/2010 02:12 AM, Jan Beulich wrote:
>> In commit 7a0fc404ae663776e96db43879a0fa24fec1fa3a you
>> disable use of PSE, but I wonder how this can take any effect on
>> 64-bit CPUs, as they use large pages during early boot already.
>> Those pages, when use of PSE gets disabled, will get broken up
>> into 4k pages in phys_pmd_init(), thus actually increasing the
>> chances that you hit the erratum.
>> 
>> What am I missing?
>> 
> 
> Those Atoms don't have 64-bit support.

That's different from what I found looking around on the web.

Jan

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