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How to find out what is making I/O accesses

Discussion in 'PC Hardware' started by Larry Martell, Mar 21, 2005.

  1. I am in the process of building a real-time system. I've been
    benchmarking my
    app, and I've found that periodically it seems to completely stop
    running
    for 500 microseconds or so. My app can detect when it's running slow,
    so
    when that occurs I output a specific value on a digital I/O port, which
    I
    used as a trigger to a PCI bus analyzer. Looking at the PCI activity
    between
    the last operation done by my app and when my app resumes running shows
    100's
    and 100's of I/O reads and writes to addresses B3, EB, and 61. There
    are no
    devices that I know of at those addresses, so I'm thinking it's
    something on
    the mother board. How can I find out what is causing those accesses?

    Thanks,
    -larry
     
    Larry Martell, Mar 21, 2005
    #1
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  2. Larry Martell

    Arno Wagner Guest

    What OS?

    Arno
     
    Arno Wagner, Mar 21, 2005
    #2
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  3. Larry Martell

    natkelcri Guest

    My real time app runs under On-Time Systems's RTOS-32. But I can boot
    my
    target system with XP if needed for investigation.

    -larry
     
    natkelcri, Mar 21, 2005
    #3
  4. Larry Martell

    Franc Zabkar Guest

    On my system 61h is the speaker.


    - Franc Zabkar
     
    Franc Zabkar, Mar 26, 2005
    #4
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