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 Post subject: Linux: Find out if CPU supports 36 bit physical addressing
PostPosted: Tue Dec 02, 2008 6:09 pm 
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Joined: Wed Jul 18, 2007 1:14 am
Posts: 181
Physical Address Extension (PAE) refers to a feature of x86 and x86-64 processors that allows more than 4G bytes of physical memory to be used in 32-bit systems. The x86 architecture presently uses only 36 bits out of 52 bits possible. On x86-64 processors, PAE is obligatory in native long mode; currently 40 bits are used out of 52 bits possible.

You can find out if your Linux kernel supports 36-bit or more physical addressing easily. You can get this information by visiting /proc/cpuinfo file. cat /proc/cpuinfo and look for the physical address size. You can also use grep command extract exact information:
Quote:
[[email protected] ~]$ cat /proc/cpuinfo

Or
Quote:
[[email protected] ~]$ grep physical /proc/cpuinfo

Output:
Code:
address sizes   : 40 bits physical, 48 bits virtual
address sizes   : 40 bits physical, 48 bits virtual


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