about pae limited


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Most modern distributions and processors support PAE, which is Intel's instruction set allowing memory addressing beyond the 32-bit limitation. PAE allows a maximum of 64GB of RAM to be accessed by the processor. PAE has additional CPU overhead.

32-bit Linux has a per process limit of 3GB addressable even with PAE. Typically, the kernel reserves approximately 1GB.

MySQL is a single process daemon. As such, it will be unable to address outside of the 32-bit limitation even with PAE.

Some useful references: