processor information:
  GenuineIntel Pentium-class processor
  Original OEM processor, P5 family, Pentium/MMX (P55C), stepping 3
  Pentium/MMX
    (the above information may not be definitive)
  Cycle and event counters, access method
    rdtsc instruction from any CPL
    rdpmc instruction from any CPL
  Indicated features
     0 Floating Point Unit
     1 Virtual-8086 Mode Extension
     2 Debugging Extension
     3 Page Size Extension
     4 Time Stamp Counter
     5 Model Specific Registers
     7 Machine Check Exception
     8 CMPXCHG8B Instruction
    23 MMX Technology

rabbit:
  Performance-Monitoring Counters Library, for Intel Processors and Linux
  Pentium/MMX version 1.00, 15 April 1999, Ames Laboratory, US DOE