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Traffic Monitor/Real-time/ Maximum ? / Graphic vs Table

Discussion in 'Asuswrt-Merlin' started by Wistuplu, Feb 26, 2020.

  1. Wistuplu

    Wistuplu New Around Here

    Oct 28, 2019
    Dear community,

    Thank you for the treasure of information in the forum. Thank you RMerlin for the firmware I'm running for approx. 5 years.

    The Traffic Monitor / Real-time page shows a table with a Maximum value and a Graphic.
    Usually for me (and at least sometimes for others, see below), the values do not match. Typically, the figure in the table is larger (20%, 50%, 80%) than the peak value in the graphic. Above, the table says 3612 KB/s, the graphic looks like 2000 KB/s.
    How exactly are those values computed ?

    My guess is that the value on the graphic is the average over a 2sec interval. (The graphic in ASUS/MERLIN is refreshed every 2 seconds. John’s firmware allows choosing 4sec, 8sec, 16sec intervals, or « OFF » which might be 2 sec. Iftop reports on 2 seconds intervals. )

    My guess is that the value in the table is more of an « instant » speed value, i.e. based on a shorter than 2 sec interval. What would be that interval ?

    Would there be a better way to get a value for the maximum "instant speed" ?

    Now, the value is the maximum over a 10 minutes window (the graphic shows 10 minutes). Would it be possible to have the value over a longer period (30 minutes, 1 hour) ?

    The twin sister of the "Real-time" page is "Last 24 hours". What do maximum values mean on that page? I have less experience with that one. The values seem to match in the table and graphic. But where I was expecting 250 Mbps (as reported after a test on fast.com), i.e. over 30 MB/s, the page only reports 18072.70 KB/s. Does it also show some sort of average ?

    Note that when the "Real-time" time window "slides", the table and the axis scale are refreshed in due time (i.e. when the highest peak disappears, falling out of the displayed time interval).

    I access the Real-Time page at https://myRouter:myPort/Main_TrafficMonitor_realtime.asp#

    2019 example from Lotta Cox that happens to also illustrate the « table has bigger max » behaviour, https://www.snbforums.com/threads/not-good-at-math.58049/#post-510606 .

    2019 example from ColinTaylor that happens to also illustrate the same behaviour with John’s firmware (and the additional options) https://www.snbforums.com/threads/not-good-at-math.58049/page-2#post-510610

    Note that the ASUS FAQ does exhibit seemingly perfectly matching values https://www.asus.com/support/FAQ/114483/ but is not very explicit about the meaning/computation of the values.

    I experience the behaviour on Merlin 384.6, Asus RT-AC56U.

    Thank you very much for your attention and any input you might share.
    Best regards

    PS: My end goal is to check whether it might make some sense for me to pay a premium for a line upgrade and/or if my QoS settings are sound.
    Another option might be to look for packets that AQM might choose to delete; with tc -s qdisc. However, using tc, the output is pretty obscure to me. Could I just look for « deleted » and use the number as an indication of saturation (0 meaning « not satured ») ? Seemingly, all my "deleted" statistics are at 0 packets.
  2. Wistuplu

    Wistuplu New Around Here

    Oct 28, 2019
    Any input ?
  3. ColinTaylor

    ColinTaylor Part of the Furniture

    Mar 31, 2014

    I believe the interval is 1 second.
    Wistuplu likes this.