linux-kernel - Re: Allocated Mem

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Message-ID: <4ACE8E9D.2040009@gmail.com>
Date:	Thu, 08 Oct 2009 19:15:09 -0600
From:	Robert Hancock <hancockrwd@...il.com>
To:	Andreas <andreas2@...ic.univie.ac.at>
CC:	linux-kernel@...r.kernel.org
Subject: Re: Allocated Mem - 700MB missing

On 10/08/2009 11:59 AM, Andreas wrote:
> Hi experts!
>
> Where are the missing 700MB ???		(4GB installed)
> 700 MB is too much, that can't be only because of version-differences!
>
> I compared (unmodified) stable/testing kernels with Xen and OpenVZ-kernel:
> all out of main debian packages:
>
> Only3200:
> ----------
> *Linux host 2.6.18-5-686 #1 SMP Mon Dec 24 16:41:07 UTC 2007 i686 GNU/Linux
> *Linux knoppix 2.6.24.4 #2 SMP PREEMPT Tue Mar 25 21:35:28 CET 2008 i686 GNU/Linux
> *Linux host 2.6.26-2-686 #1 SMP Sun Jun 21 04:57:38 UTC 2009 i686 GNU/Linux
>
>
> Full4GB:
> ---------
> *Linux host 2.6.26-2-openvz-686 #1 SMP Sun Jun 21 07:07:25 UTC 2009 i686 GNU/Linux

Check the kernel configuration. For 32-bit kernels you need 
CONFIG_HIGHMEM64G enabled to use memory above 4GB (including in your 
case, because of the PCI, etc. memory holes). Though it would be better 
to use a 64-bit kernel.
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