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

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Date:	Fri, 21 Dec 2012 18:42:47 -0800
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	Yinghai Lu <yinghai@...nel.org>,
	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

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?

Eric
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