linux-kernel - Re: kdump broken on 2.6.37-rc4

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Date:	Fri, 17 Dec 2010 09:56:42 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Vivek Goyal <vgoyal@...hat.com>
CC:	Yinghai <yinghai@...nel.org>,
	Stanislaw Gruszka <sgruszka@...hat.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Maxim Uvarov <muvarov@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Neil Horman <nhorman@...hat.com>
Subject: Re: kdump broken on 2.6.37-rc4

On 12/17/2010 09:01 AM, Vivek Goyal wrote:
> On Thu, Dec 16, 2010 at 07:58:48PM -0800, Yinghai wrote:
>> Please don't do that to 64 bit
>>
>> My big system with 1024g memory and a lot of cards with rhel 6 to make kdump work must have crashkernel=512m and second kernel need to take pci=nomsi
>>
> 
> I agree here that we should not do it for 64 bit.
> 
> - Just because we need it for 32 bit does not mean we should limit it for
>   64bit. And we do want to have the capability to boot the kernel from as
>   high memory as possible so creating another aritificial limit is counter
>   to that.
> 
> - I would not worry too much about backward compatibility and allow
>   booting 32bit kernel till 768MB. The reason being that most of the
>   distros use same kernel for crash dumping as regular kernel. Maintainig
>   two separate kernels is big hassle.
> 
>   So a small set of people who run into issue, would need to change kernel
>   command line "crashkernel=128M@64M" or something similar.
> 

Do we have actual testing for how high the 64-bit kernel will load?  I'm
assuming that the usage of a 32-bit kdump kernel for a 64-bit main
kernel is nonexistent.

	-hpa
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