linux-kernel - Re: [PATCH] x86-64: disable the GART before allocate aperture

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Date:	Fri, 22 Jun 2007 15:43:00 -0700
From:	Yinghai Lu <Yinghai.Lu@....COM>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Muli Ben-Yehuda <muli@...ibm.com>, Andi Kleen <ak@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Vivek Goyal <vgoyal@...ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86-64: disable the GART before allocate aperture

Eric W. Biederman wrote:
> The original design came from thinking about systems where using the iommu
> was mandatory.  I think we almost always reserve memory below 1G for the kexec
> on panic kernel so it really shouldn't be an issue in that case.  Except
> we need to pass an option to force not using the iommu.  I don't think
> noiommu or swiotlb is going to make any real difference.
> 
> So I'm totally in favor of turning off features if we don't need them and we
> don't take a tremendous performance hit.  (People get grumpy when writing
> all of memory to disk takes completely unreasonable amounts of time).


So you prefer to
add diable_gart in shutdown or suspend func and let kexec to use swiotlb comand line?

YH
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