On Tue, Feb 10, 2004 at 09:16:25AM +0100, Andreas Wohlfeld wrote: > On Tue, Feb 10, 2004 at 09:03:30AM +0100, Lionel Elie Mamane wrote: >> NForce3 150 Pro chipset) with 4GB of memory installed: The BIOS (and >> thus Linux) recognises only between about 2.5GB and 3.5GB of RAM, ^^^^^ Forgot to say "as well a 32 bit Linux as a 64 bit Linux". > You have to read the mainboard manual. Funnily, I did, but somehow missed the one sentence that talks about this. > It states that this is normal behavior due to memory space > allocation of chips on the mainboard and graphics card. > 4 GB minus 0.4 GB for mainboard chipset minus AGP apterture size > sounds about right. Well, it looks more like 0.4GB + 2*(AGP aperture): With a maximal aperture (512MB), I have only about 2.5GB "left". With a minimal aperture (32MB? 16MB? I'm not sure any more), I have about 3.5GB "left". > It's a limitation of the 32 bit architecture. It does not happen > with server mainboards in 40 bit flat or 36 bit PSE mode. Well, but then I would expect that a 64 bit Linux would go in 40 bit flat mode. Do I need to pass it a special boot parameter for this? The documentation claims that the board supports 8GB of memory, so there must be _some_ way for the OS to access more than 4GB. Do the Opteron CPU's support PSE at all? I thought it was an Intel-only thing. -- Lionel
Attachment:
signature.asc
Description: Digital signature