1 Reply Latest reply on Jun 5, 2015 9:03 AM by jc

    Not able to meassure the ISR and IST Latency using ILTIMING on x86 WEC7

    Vishnu Community Member

      Hello,

      We have Intel Atom E38xx SMP based device, when I tried to measure the ISR and IST latency using ILTIMING.exe, It gives 0.0 as both ISR and IST latency.

      I see I ILTIMING support  code in PeRPISR(). Is there any modification needed apart from this?

      ++ILTiming (Loader): ()
      iltiming
      ILTiming GetPFN
      ++ILTiming (Loader): (-z -i0)
      iltiming -z -i0
      ILTiming GetPFN
      Secondary ILTIMING process starting.

      vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
      vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
      ===================================================================
                       INTERPRETING THE ILTIMING RESULTS
      -------------------------------------------------------------------
         ILTiming measures the interrupt service routine (ISR) and
         interrupt service thread (IST) latencies.

         ISR latency measured is the time from the physical interrupt
         asserting (timer wrap) to the start of the OEM ISR code.

      -------------------------------------------------------------------
         SYSTEM BUILD INFO

         PLATFORM   = ATOM
         PROCESSOR  = x86
         CONFIG     = cebase
         RET/DEBUG  = retail
         BUILD DATE = Jun  2 2015 @ (12:03:23)
      -------------------------------------------------------------------
         COUNTER INFO

         Counter Frequency     = 1460000000 Hz
         Counter tick interval = 0 ns
      -------------------------------------------------------------------
         RUNTIME OPTIONS

         Timing interval      = 5
         Number of interrupts = 10
      ===================================================================
      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^


      ILTiming GetPFN
      ILTiming Enabled (@ every 5 ticks)
      ILTiming Disabled
      OEMInterruptDisable(10), irq: -1 trying to disable an interrupt that is already disabled
      Discarded 2983 timings due to interrupts
      All times are in microseconds.

      Summary:
                           ISR starts   IST starts
      min                        0.0          0.0
      ave                        0.0          0.0
      max                        0.0          0.0

      Build,Platform,Processor,Project,Debug,Number of Interrupts,ISR Min,ISR Max,ISR Ave,IST Min,IST Max,IST Ave,Thread Priority,Idle Threads,read Priority,Idle Threads
      2824, ATOM,        x86,    cebase,    retail,10,                    0.0,    0.0,    0.0,    0.0,    0.0,    0.0,    0,        0
      Exiting secondary ILTIMING process.
      --ILTiming (Loader): Done!
      --ILTiming (Loader): Done!