linux-kernel - Re: x86_64 virtual memory map

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Message-ID: <m1ei1ewsxa.fsf@fess.ebiederm.org>
Date:	Mon, 25 Jul 2011 03:33:53 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Bob Zhang <zhanglinbao@...il.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	hayfeng Lee <omycle@...il.com>, ak@...ux.intel.com,
	Bob Zhang <2004.zhang@...il.com>
Subject: Re: x86_64 virtual memory map

Bob Zhang <zhanglinbao@...il.com> writes:

> I have HP's latest Proliant machine , The test involves using
> configurations of 1 TB of Ram then 2TB of RAM. The system ROM is
> reporting the proper amount of installed memory, however, Linux is
> only reporting 992GB with both 1TB and 2 TB of memory in the system.
> The customer has made the changes in the RMSU from 40 to 44 bit
> addressing when using the 2TB of memory but this does not change
> anything.
> I am using SLES 11 SP1 (linux kernel is 2.6.32)
> Does anyone have any idea how to get Linux to see the full amount of
> memory?

What does the e820 map printed by the kernel at the start of time
report?  In particular is all of memory visible there?

Eric

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