From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Andi Kleen <ak@suse.de>
Cc: torvalds@osdl.org, linux-kernel@vger.kernel.org, discuss@x86-64.org
Subject: Re: [1/3] Add 4GB DMA32 zone
Date: Mon, 12 Sep 2005 11:28:19 +0100 [thread overview]
Message-ID: <1126520900.30449.48.camel@localhost.localdomain> (raw)
In-Reply-To: <43246267.mailL4R11PXCB@suse.de>
> One argument was still if the zone should be 4GB or 2GB. The main
> motivation for 2GB would be an unnamed not so unpopular hardware
> raid controller (mostly found in older machines from a particular four letter
> company) who has a strange 2GB restriction in firmware. But
Adaptec AACRAID is one offender
> that one works ok with swiotlb/IOMMU anyways, so it doesn't really
Old aacraid actually cannot use IOMMU. It isn't alone in that
limitation. Most hardware that has a 30/31bit limit can't go via the
IOMMU because IOMMU space appears on the bus above 2GB so is itself
invisible to the hardware.
Other devices with similar limits include the broadcomm b44
next prev parent reply other threads:[~2005-09-12 10:03 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-11 16:59 [1/3] Add 4GB DMA32 zone Andi Kleen
2005-09-12 7:44 ` [discuss] " Jan Beulich
2005-09-12 7:58 ` Andi Kleen
2005-09-12 10:28 ` Alan Cox [this message]
2005-09-12 10:42 ` Andi Kleen
2005-09-12 11:33 ` Alan Cox
2005-09-12 11:22 ` Andi Kleen
2005-09-12 12:34 ` Alan Cox
2005-09-12 12:28 ` [discuss] " Andi Kleen
2005-09-12 18:18 ` Jeff Garzik
2005-09-12 22:02 ` Bart Hartgers
2005-09-13 3:20 ` Andi Kleen
2005-09-12 19:55 ` Mark Lord
2005-09-12 12:45 ` Roman Zippel
2005-09-12 12:46 ` Andi Kleen
2005-09-12 12:50 ` Roman Zippel
2005-09-12 12:54 ` Andi Kleen
2005-09-12 13:01 ` Roman Zippel
2005-09-13 9:15 ` Roman Zippel
2005-09-13 9:47 ` [discuss] " Andi Kleen
2005-09-13 10:15 ` Andrew Morton
2005-09-13 11:32 ` Andi Kleen
2005-09-13 12:09 ` Roman Zippel
2005-09-13 23:51 ` KAMEZAWA Hiroyuki
2005-10-03 15:46 ` Coywolf Qi Hunt
-- strict thread matches above, loose matches on Subject: below --
2005-09-12 11:44 Salyzyn, Mark
2005-09-12 11:51 ` Andi Kleen
2005-09-12 12:08 Salyzyn, Mark
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