On Thu, 23 Nov 2017 10:00:29 +0000, Andrew Cooper   
    wrote:   
   >...   
   >This use of rdtsc isn't accurate.  It will be reordered in the pipeline   
   >with the content you are trying to time.   
   >   
   >If you have rdtscp available, use that.  It specifically has fencing   
   >properties to prevent reordering.   
   >   
   Since I only use RDTSC at the start and end of the code, and it runs   
   12 seconds that will not add to the timing at all, but yeah using it   
   is an old habit from Pentium days, I will switch to RDTSP.   
   --   
   aen   
      
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