linux-kernel - Re: [PATCH 3/3] x86/iommu: use __GFP

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Message-Id: <20080929030640X.fujita.tomonori@lab.ntt.co.jp>
Date:	Mon, 29 Sep 2008 03:06:40 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	mingo@...e.hu
Cc:	joerg.roedel@....com, mingo@...hat.com, tglx@...utronix.de,
	hpa@...or.com, linux-kernel@...r.kernel.org,
	fujita.tomonori@....ntt.co.jp
Subject: Re: [PATCH 3/3] x86/iommu: use __GFP_ZERO instead of memset for
	GART

On Sat, 27 Sep 2008 20:18:55 +0200
Ingo Molnar <mingo@...e.hu> wrote:

> another thing:
> 
> How hard would it be to add an CONFIG_IOMMU_DEBUG option that forces as 
> many DMA requests to go via the IOMMU as possible?
> 
> This slows things down of course so it's only for debugging - but it 
> also makes sure that we utilize the IOMMU code to the maximum - which is 
> not normally the case.

If you use iommu=force boot option, GART always tries to use the
IOMMU.
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