linux-kernel - Re: [PATCH 0/3] Early use of boot service memory

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Message-ID: <528ABFA3.6060905@zytor.com>
Date:	Mon, 18 Nov 2013 17:32:19 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Vivek Goyal <vgoyal@...hat.com>
CC:	Yinghai Lu <yinghai@...nel.org>, Ingo Molnar <mingo@...nel.org>,
	jerry.hoemann@...com, Pekka Enberg <penberg@...nel.org>,
	Rob Landley <rob@...dley.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	x86 maintainers <x86@...nel.org>,
	Matt Fleming <matt.fleming@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"list@...ederm.org:DOCUMENTATION" <linux-doc@...r.kernel.org>,
	"list@...ederm.org:MEMORY MANAGEMENT" <linux-mm@...ck.org>,
	linux-efi@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/3] Early use of boot service memory

On 11/15/2013 10:30 AM, Vivek Goyal wrote:
> 
> And IOMMU support is very flaky with kdump. And IOMMU's can be turned
> off at command line. And that would force one to remove crahkernel_low=0.
> So change of one command line option forces change of another. It is
> complicated.
> 
> Also there are very few systems which work with IOMMU on. A lot more
> which work without IOMMU. We have all these DMAR issues and still nobody
> has been able to address IOMMU issues properly.
> 

Why do we need such a big bounce buffer for kdump swiotlb anyway?
Surely the vast majority of all dump devices don't need it, so it is
there for completeness, no?

	-hpa


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