From: Johannes Berg <johannes@sipsolutions.net>
To: Kyle McMartin <kyle@infradead.org>
Cc: Andres Freund <andres@anarazel.de>,
Tomas Winkler <tomasw@gmail.com>,
Muli Ben-Yehuda <muli@il.ibm.com>, Jeff Garzik <jeff@garzik.org>,
linux-kernel@vger.kernel.org,
linux-wireless <linux-wireless@vger.kernel.org>
Subject: Re: bad DMAR interaction with iwlagn and SATA
Date: Tue, 07 Oct 2008 19:08:43 +0200 [thread overview]
Message-ID: <1223399323.7328.51.camel@johannes.berg> (raw)
In-Reply-To: <20081007170404.GB5171@bombadil.infradead.org>
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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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prev parent reply other threads:[~2008-10-07 17:08 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200809251511.20132.andres@anarazel.de>
2008-09-26 15:10 ` bad DMAR interaction with iwlagn and SATA Johannes Berg
2008-09-29 8:26 ` Andres Freund
[not found] ` <48DC44D4.8000103@garzik.org>
[not found] ` <200809260419.07713.andres@anarazel.de>
[not found] ` <48DC4BC0.7090203@garzik.org>
[not found] ` <20080926144708.GD9118@il.ibm.com>
2008-09-26 15:12 ` Johannes Berg
2008-09-26 23:30 ` Tomas Winkler
2008-09-29 8:27 ` Andres Freund
2008-09-29 8:40 ` Tomas Winkler
2008-10-06 12:26 ` Johannes Berg
2008-10-06 14:32 ` Andres Freund
2008-10-07 8:37 ` Johannes Berg
2008-10-07 17:04 ` Kyle McMartin
2008-10-07 17:08 ` Johannes Berg [this message]
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