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From: Francois <danzas@9online.fr>
Newsgroups: comp.sys.mac.hardware.misc
Subject: Re: Memory lock failed
Date: Sat, 20 Aug 2011 17:08:34 +0200
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On 20/08/2011 14:45, philo wrote:

>
>
>
> More than likely you are booting to single mode using the 32bit kernel
> which cannot address more than 4 gigs of ram.
>
> To access the full amount of ram you will need to boot to the 64bit kernel
>
>
>
> Supposedly you can boot the the 64 bit kernel by holding down the "6"
> and the "4" keys while booting
>
> I am no mac expert though

You are right on, philo. When I ran those memtest tests, I was under 
Snow Leopard, and maybe the kernel that appeared in Single User Mode 
(SUM) was 32 bits. Nevertheless memtest took nearly all the memory fro 
testing it (about 23 GB) but could not, of course lock it.
  Now I am under  Lion ( OS X 10.7.1 ) and, when under SUM, it is well 
specified that the kernel is 64 bits : "Kernel is LP64"
When running memtest, it says : "Attempting memory lock ... locked 
successfully".
Thanks to you this "lock mystery" is solved and I'll be much more 
confident in memtest results in the future.
Very best regards.