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packet rate too slow

Discussion in 'SimTools Plugins' started by astone, Aug 17, 2017.

  1. astone

    astone New Member

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    I found a strange phenomenon need your help.

    When I set "packet rate=20ms" in interface dialog, I think I can get 50 output data per second.
    But the fact is when I set packet rate from 1ms to 15ms, the game engine always outputs about 64 data per second. When I set packet rate between 16ms to 30ms, the game engine just outputs 32 data per second.

    no matter what type (memory hook, UDP...) of plugin I used, I always get the above result. Could somebody help me to know what affects the packet rate?

    Thanks.
    astone, Aug 17, 2017
    #1
  2. yobuddy

    yobuddy Well-Known Member Staff Member Moderator SimAxe Beta Tester SimTools Developer Gold Contributor

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    The 'Packet Rate' is the amount of time in ms to pause between sending packets.
    Depending on the interface your using, it may be faster or slower.

    But that's seems really slow, what are you using?
    I would think even a Arduino is allot faster than that?
    A cheep SCN serial adapter does about 250 a sec.
    yobuddy
    yobuddy, Aug 18, 2017
    #2
  3. astone

    astone New Member

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    I try COM port and UDP in interface settings. for example,
    I setup 2 virtual COM ports in my desktop.
    The game engine interface sets up to one virtual COM port, and other COM port connected to a terminal window to receive the data from game engine.
    No matter COM port or UDP I used, I always get the same result -- 33data a second, when packet rate=20ms

    My simtools version is v1.3.
    OS: win10, 32bits.

    What information I can offer for this question?
    astone, Aug 23, 2017
    #3
  4. SeatTime

    SeatTime Well-Known Member

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    V1.3 is not supported anymore. Recommend that you start by moving to V2.
    • Agree Agree x 1
    SeatTime, Aug 23, 2017
    #4
  5. astone

    astone New Member

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    I had remove v1.3 and install v2.1 yesterday, and the output rate is still low. (I found the packet rate change to output rate in v2.1)
    To simplify the question. I provide the step to reproduce the phenomenon.
    1. Lunches game engine, setup interface settings as bellows.
    1.1. interface type = network
    1.2. ip=127.0.0.1, port=6666
    1.3. output - bit rate=7, type=decimal
    1.4. interface output=<Axis1>;, output rate=20ms
    2. Lunches a receiving program to receive the data.
    3. Switch to output testing in game engine, and press turn on button.
    The game engine start to send data to receiving program.
    Then I count the data in a second, and found just 30 data in a second.

    I used this in different desktop, and results are all the same. How can I make the output data=50 when output rate sets to 20ms?

    Thanks very much.
    astone, Aug 24, 2017
    #5
  6. astone

    astone New Member

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    I upload 2 picture for my setting and result.

    Attached Files:

    • ge.png
      ge.png
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    • ge2.png
      ge2.png
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    astone, Aug 24, 2017
    #6
  7. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
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    Are you doing all this due to it not working, or is it purely academic ?
    SeatTime, Aug 24, 2017
    #7
  8. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    I really don't get the purpose of what you are trying to do.

    Just so you know in SimTools 2 the Interface Settings should be like this <Axis1a>

    Why do you have start up and shutdown output set, as this is obviously not hooked up to a simulator?

    Things like your system language settings can affect UDP: https://www.xsimulator.net/community/faq/udp-games-produce-no-output-data.181/

    If it is axis analysis that your are interested in then try this handy app, which was created for that purpose: https://www.xsimulator.net/community/faq/axis-analysis-app.282/

    If that is not what you are trying to do then it would help if you explain your aim in a bit more detail.

    I am not clear on your measurement tool/process but would expect something like Iperf would work well if just looking at UDP: http://www.firewall.cx/downloads/ad...rf-network-bandwidth-delay-jitter-tester.html
    Last edited: Aug 24, 2017
    noorbeast, Aug 24, 2017
    #8
  9. astone

    astone New Member

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    It's not working for my project, not academic. The output data is not similar to what the content input to simtools, so I try to check the output data and found low output rate.
    astone, Aug 24, 2017
    #9
  10. astone

    astone New Member

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    Here I upload my testing result, I can't understand why NB5, NB6, VBox data output are 32data, 64data... It looks something wrong..

    Attached Files:

    • 1.png
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    astone, Aug 24, 2017
    #10
  11. yobuddy

    yobuddy Well-Known Member Staff Member Moderator SimAxe Beta Tester SimTools Developer Gold Contributor

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    See if this makes a difference on your system buddy.
    system local.jpg
    yobuddy, Aug 25, 2017
    #11
  12. astone

    astone New Member

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    Whatever win 10 is Chinese version or English version, all of them already set to "English(United States)".
    astone, Aug 25, 2017
    #12
  13. yobuddy

    yobuddy Well-Known Member Staff Member Moderator SimAxe Beta Tester SimTools Developer Gold Contributor

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    Last time I checked output rate with SimTools v1.3 was with a scn actuator and a cheep ftdi adapter.
    And I got over 255 packets a sec with 10ms output rate for reference.
    I don't really understand how your doing your tests, sorry man.
    yobuddy
    yobuddy, Aug 26, 2017
    #13
  14. astone

    astone New Member

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    Sorry, I confused.
    I really don't understand why it happened that over 255 packets a sec with 10ms output rate.

    In my understanding, packet rate is the amount of time to pause between sending packets as you said. So when the packet rate sets to 10ms, it means game engine will pause 10ms after sending "ONE" packet. Following this mindset, only less than 100 times to pause a sec. And that means less than 100 packets sent a sec. Why you can get over 255 packets a sec?

    Follows your reply - over 255 packets a sec GE sent with 10ms packet rate, that means GE sends 2.55 packets a time? so flow shows as bellows.

    send 2.55 packets -> pause 10ms -> send 2.55 packets -> pause 10ms.........

    is it right?
    astone, Aug 28, 2017
    #14
  15. SeatTime

    SeatTime Well-Known Member

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    :popcorn....:).
    SeatTime, Aug 28, 2017
    #15
  16. yobuddy

    yobuddy Well-Known Member Staff Member Moderator SimAxe Beta Tester SimTools Developer Gold Contributor

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    @astone,
    its been forever since I did the tests with v1.3 buddy.
    So it may have been with a 1ms pause, my bad.
    yobuddy
    yobuddy, Aug 28, 2017
    #16
  17. astone

    astone New Member

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    astone, Aug 31, 2017
    #17