To: Cong Wang <amwang@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>, Vitaly Mayatskikh <v.mayatskih@gmail.com>,
       linux-kernel@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>,
       Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
       Haren Myneni <hbabu@us.ibm.com>, Neil Horman <nhorman@tuxdriver.com>,
       kexec@lists.infradead.org
Subject: Re: [PATCH 0/5] Add second memory region for crash kernel
References: <1271953392-6324-1-git-send-email-v.mayatskih@gmail.com>
	<m1aasvkupc.fsf@fess.ebiederm.org> <20100422224525.GJ3228@redhat.com>
	<m1eii7j8ne.fsf@fess.ebiederm.org> <4BD12E48.3080400@redhat.com>
From: ebiederm@xmission.com (Eric W. Biederman)
Date: Thu, 22 Apr 2010 22:42:25 -0700
In-Reply-To: <4BD12E48.3080400@redhat.com> (Cong Wang's message of "Fri\, 23 Apr 2010 13\:21\:12 +0800")
Message-ID: <m1zl0uiv26.fsf@fess.ebiederm.org>
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Cong Wang <amwang@redhat.com> writes:

> Eric W. Biederman wrote:
>> Vivek Goyal <vgoyal@redhat.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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