[BALU] 64 bit systems

Thomas Stover thomas at wsinnovations.com
Fri Jun 8 10:49:46 CDT 2007


The physical address space is 48 bits, so that limits the amount of real 
ram in the system. However from a process's point of view the "virtual" 
address space is 64 bits, and that could still be utilized with file 
mapping and /or  NUMA  machines.

jim wrote:

>Is not the address space only 48 bits, 256 terabytes
><http://en.wikipedia.org/wiki/Tebibyte>.    (I am looking foward to
>buying 1 terabyte[1000 gigabytes] surplus memory). 
>and the actual Ram only 40 bit addressing or just 1 terabyte of RA.  
>
>But the registers and data width are 64 bits are they not. 
>
>I think the 40 and 48 restrictions are only for memory ops. 
>  
>





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