[LAU] question about RAM amount

[Dave Phillips]

Forwarded to the 64 Studio devs:

Mark Knecht wrote:
> On Fri, Aug 1, 2008 at 8:12 AM, Dave Phillips <dlphillips at woh.rr.com> wrote:
>   
>> Greetings,
>>
>> Yet another round of upgrades here. I installed another gig of RAM in
>> each machine. The JAD box (32-bit) reads correctly at 3.1 G during the
>> boot, but the 64 Studio box reads only 3.67 G. It's supposed to be 4
>> gigs, what happened to the rest of it ?
>>
>> Mobos are identical Gigabyte boards, CPUs are both AMD64, so the amount
>> should be supported, yes ? Video boards are also identical, with 512 MB
>> on-board memory.
>>
>> The BIOS and dmesg yield the same report. Did I miss something ? DIMMs
>> not arranged properly, or ... ?
>>
>> Best,
>>
>> dp
>>     
>
> Dave,
>    I'e not had to do this myself as I've never had 4GB but have you
> enabled all the high memory, large memory options in the kernel? I
> believe the kernel is limited to 4GB memory ADDRESS SPACE without them
> and some of the ADDRESS SPACE is dedicated to other things in the
> system, like mapping PCI bridges, peripherals and such. However when
> you enable the larger memory models then I think that gets moved out
> of the way and you see more of your RAM.
>
>    Completely a guess because as I say I've never even used a machine with 4GB.
>
> Hope this helps,
> Mark
>   
Thanks, Mark. I've cc'd this reply to Free at 64 Studio, he's the 
builder. I checked the kernel config, all the MEM stuff looks okay, but 
Free can say for sure.

Best,

dp