linux-kernel - Re: [PATCH 04/13] x86, mm: Revert back good

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Date:	Fri, 05 Oct 2012 14:32:26 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Jacob Shin <jacob.shin@....com>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Tejun Heo <tj@...nel.org>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 04/13] x86, mm: Revert back good_end setting for 64bit

Yinghai Lu <yinghai@...nel.org> writes:

> On Fri, Oct 5, 2012 at 2:04 PM, Eric W. Biederman <ebiederm@...ssion.com> wrote:
>>>> Is there a git commit that explains what the 'big range' problem is?
>>
>> At least on x86_64 this was recently tested and anywhere below 4G is
>> good, and there is a patch floating around somewhere to remove this
>> issue.
>
> patch for kernel or kexec-tools?

kernel.

The sgi guys needed a kdump kernel with 1G of ram to dump their all of
the memory on one of their crazy large machines and so investigated
this.

Basically they found that a kdump kernel loaded anywhere < 4G worked,
the only change that was needed was to relaxy the 896M hard code.

In one test they had a kdump kernel loaded above 2G.

Eric

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