linux-kernel - Re: bad DMAR interaction with iwlagn and SATA

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Message-Id: <1223399323.7328.51.camel@johannes.berg>
Date:	Tue, 07 Oct 2008 19:08:43 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Kyle McMartin <kyle@...radead.org>
Cc:	Andres Freund <andres@...razel.de>,
	Tomas Winkler <tomasw@...il.com>,
	Muli Ben-Yehuda <muli@...ibm.com>,
	Jeff Garzik <jeff@...zik.org>, linux-kernel@...r.kernel.org,
	linux-wireless <linux-wireless@...r.kernel.org>
Subject: Re: bad DMAR interaction with iwlagn and SATA

On Tue, 2008-10-07 at 13:04 -0400, Kyle McMartin wrote:

> 2MB pages (and 4MB pages) are dependent on PSE/PAE, there's no configurable
> page size on x86 like there is on other platforms.
> 
> PSE gives you 4MB pages, PAE reduces your 4MB pages to 2MB pages (for
> extra flag and address bits.)
> 
> About the only useful places for these are large mappings like ioremap
> and whatnot.

Thanks for the explanation. Can you explain too why iwlwifi crashes when
I enable 64k pages? ;)

johannes

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