title: Process.TotalProcessorTime exceeds the actual time passing
body: <p>I want to calculate the average CPU usage % between two points of time.
  I use the ratio between t1-t0 and Process.TotalProcessorTime1 - Process.TotalProcessorTime0
  (where t is the actual <code>DateTime.Now</code> at that point)</p>
  
  <p>but sometimes when the computer is busy I get the TotalProcessorTime difference in Ticks is larger than the actual time (in Ticks) that passed, so my cpu% exceeds 100.</p>
  
  <p>how can that be? </p>
  
  <pre><code>long currentLogTime = DateTime.Now.Ticks;
  long currentSPUUsageTime = _process.TotalProcessorTime.Ticks;
  
  long timeDiff= currentLogTime - m_LastLogTime;
  if (timeDiff != 0)
  {
      cpuUsage = (currentSPUUsageTime - m_LastCPUUsageTime) * 100 / timeDiff;
  }
  </code></pre>