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

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Date:	Fri, 23 Apr 2010 09:08:45 +0200
From:	Vitaly Mayatskikh <v.mayatskih@...il.com>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.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>,
	Cong Wang <amwang@...hat.com>, kexec@...ts.infradead.org
Subject: Re: [PATCH 0/5] Add second memory region for crash kernel

At Thu, 22 Apr 2010 18:45:25 -0400, Vivek Goyal wrote:

> 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?

I tried it on system with 96G of RAM. When I reserved 512M for kdump
kernel, system stopped loading somewhere in user space. With larger
reserved area /sbin/kexec can't load kernel (because of hardcoded
limitation in /sbin/kexec). After removing this limitation kernel was
loaded below 2G, but system even hasn't booted.

Unfortunately, I don't remember exact details now and have no access
to that machine temporarily. Will try to get access and come back with
details.
-- 
wbr, Vitaly
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