linux-kernel - Re: [PATCH 0/5] Add second memory region for crash kernel

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Message-ID: <m1zl0uiv26.fsf@fess.ebiederm.org>
Date:	Thu, 22 Apr 2010 22:42:25 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Cong Wang <amwang@...hat.com>
Cc:	Vivek Goyal <vgoyal@...hat.com>,
	Vitaly Mayatskikh <v.mayatskih@...il.com>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Haren Myneni <hbabu@...ibm.com>,
	Neil Horman <nhorman@...driver.com>, kexec@...ts.infradead.org
Subject: Re: [PATCH 0/5] Add second memory region for crash kernel

Cong Wang <amwang@...hat.com> writes:

> Eric W. Biederman wrote:
>> Vivek Goyal <vgoyal@...hat.com> writes:
>>
>>> Vitaly, have you really run into cases where 2G upper limit is a concern.
>>> What is the configuration you have, how much memory it has and how much
>>> memory are you planning to reserve for kdump kernel?
>>
>> A good question.
>>
>
> We have observed that on a machine which has 66G memory, when we do
> crashkernel=1G@4G, kexec failed to load the crash kernel, but the memory
> reservation _did_ succeed.

Did you try loading vmlinux?   If not this sounds like the fact that
/sbin/kexec doesn't realize it can boot a 64bit bzImage in 64bit
mode.

Eric

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