Memory Expansion Technology Files

Researchers studying L3 cache behaviour or P6 front side
bus can use these scripts to collect live statistics
from the MXT memory controller.

1. Use startperf script as an example to collect counter
data.  
2. Use ICRcodes.pdf to determine which ICR code is needed for selected IRA/IRB modes.

Counter definitions are explained in the script.  When you use code 0x30f02 as in the script, the IRA values are L3 hits,  and IRB values are L3 misses.
/proc/sys filesystem cannot easily display 64 bit numbers or unsigned numbers.  Therefore a 64 bit integer is represented as two 32 bit signed integers
as  <ira low64> <ira hi64> <irb low64> <irb hi64>.   Combine low32 with high32 to form a 64 bit int.   If the low32 is negative, convert that in to
unsigned int by adding 2^32.