From: Christoph Hellwig <hch@infradead.org>
To: Matthew Wilcox <willy@debian.org>
Cc: "Salyzyn, Mark" <mark_salyzyn@adaptec.com>,
Alan Cox <alan@redhat.com>,
linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org
Subject: Re: PATCH: Further aacraid work
Date: Thu, 17 Jun 2004 14:19:03 +0100 [thread overview]
Message-ID: <20040617131903.GA31775@infradead.org> (raw)
In-Reply-To: <20040617130713.GX20511@parcelfarce.linux.theplanet.co.uk>
On Thu, Jun 17, 2004 at 02:07:13PM +0100, Matthew Wilcox wrote:
> It's a hard problem. Where's the right tradeoff? I have a system that
> has a memory map that puts the first 3.75GB of memory at 0, then the
> next 256MB at 64GB, then continues from 4GB. If there's only 4GB of
> RAM in that system, I'm sure you'd rather use 32-bit descriptors and
> anything in that 256MB gets bounce-buffered.
With the SGI iommu it doesn't matter how much memory you have anyway,
if you're using DAC you'll always get high bits set in your dma address.
I suspect many other iommus work the same.
next prev parent reply other threads:[~2004-06-17 13:19 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-17 12:53 PATCH: Further aacraid work Salyzyn, Mark
2004-06-17 12:53 ` Salyzyn, Mark
2004-06-17 13:07 ` Matthew Wilcox
2004-06-17 13:19 ` Christoph Hellwig [this message]
2004-06-17 13:55 ` James Bottomley
2004-06-17 13:32 ` Christoph Hellwig
2004-06-17 14:02 ` Alan Cox
-- strict thread matches above, loose matches on Subject: below --
2004-06-29 20:55 Salyzyn, Mark
2004-06-29 23:22 ` Byron Stanoszek
2004-06-30 19:52 ` Byron Stanoszek
2004-06-30 19:59 ` Dario
2004-06-29 19:27 Salyzyn, Mark
2004-06-29 20:20 ` Byron Stanoszek
2004-06-29 20:42 ` Alan Cox
2004-06-29 18:53 Salyzyn, Mark
2004-06-29 19:03 ` Byron Stanoszek
2004-06-28 13:17 Salyzyn, Mark
2004-06-18 20:53 Salyzyn, Mark
2004-06-18 20:53 ` Salyzyn, Mark
[not found] <286GI-5y3-11@gated-at.bofh.it>
[not found] ` <286Qp-5EU-19@gated-at.bofh.it>
2004-06-17 19:10 ` Andi Kleen
2004-06-17 20:54 ` Alan Cox
2004-06-17 21:13 ` James Bottomley
2004-06-17 21:25 ` Andi Kleen
2004-06-18 15:19 ` Benjamin Herrenschmidt
2004-06-18 5:57 ` Jeff Garzik
2004-06-18 14:07 ` James Bottomley
2004-06-18 15:17 ` Benjamin Herrenschmidt
2004-06-17 17:54 Salyzyn, Mark
2004-06-17 20:38 ` Alan Cox
2004-06-17 20:48 ` William Lee Irwin III
2004-06-17 20:56 ` James Bottomley
2004-06-18 15:05 ` William Lee Irwin III
2004-06-18 20:32 ` William Lee Irwin III
2004-06-27 17:33 ` James Bottomley
2004-06-17 14:39 Salyzyn, Mark
2004-06-17 14:39 ` Salyzyn, Mark
2004-06-17 14:55 ` James Bottomley
2004-06-17 14:58 ` Alan Cox
2004-06-17 15:15 ` Arjan van de Ven
2004-06-17 19:16 ` James Bottomley
2004-06-17 16:32 ` Clay Haapala
2004-06-17 16:37 ` James Bottomley
2004-06-17 16:46 ` Alan Cox
2004-06-17 15:11 ` Anton Blanchard
2004-06-16 21:04 Alan Cox
2004-06-16 21:33 ` Christoph Hellwig
2004-06-16 21:40 ` Alan Cox
2004-06-16 21:42 ` Christoph Hellwig
2004-06-16 21:48 ` Alan Cox
2004-06-16 21:58 ` Christoph Hellwig
2004-06-16 22:06 ` Alan Cox
2004-06-29 17:48 ` Byron Stanoszek
2004-06-29 18:27 ` Mark Haverkamp
2004-06-29 18:37 ` Alan Cox
2004-06-30 2:02 ` bm
2004-06-30 16:07 ` Alan Cox
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