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
Wistuplu
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.
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
Wistuplu
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.
