linux-kernel - Re: [PATCH v7 24/27] x86: Add swiotlb force off support

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Message-ID: <CAE9FiQV9_A3BX=vdQLzk4kUf8bfbBWR3ihtC+GfM+9Tj_ZysVQ@mail.gmail.com>
Date:	Fri, 21 Dec 2012 21:10:30 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 24/27] x86: Add swiotlb force off support

On Fri, Dec 21, 2012 at 6:42 PM, Eric W. Biederman
<ebiederm@...ssion.com> wrote:
> Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> writes:
>
>> On Mon, Dec 17, 2012 at 11:15:56PM -0800, Yinghai Lu wrote:
>>> So use could disable swiotlb from command line, even swiotlb support
>>> is compiled in.  Just like we have intel_iommu=on and intel_iommu=off.
>>
>> You really need to spell out why this is useful.
>
> YH why can't we safely autodetect that the swiotlb is unusable when
> there is no memory below 4G free?

good point.

will give it try.

Yinghai
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