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Thread: Speed dropout

  1. #1
    Junior Member
    Join Date
    Nov 2020

    Speed dropout

    Centurylink DSL, 20meg, Technicolor C2100T, Fedora

    So every once in a while I click on a link and nothing happens for several seconds or streaming a video, buffering, and it got annoying. So I set up a testing script using speedtest-cli, MariaDB, and Phplot. I run speedtest-cli every 5 minutes and I'm surprised. On a regular basis, every 90 to 100 minutes my speed drops from 19Mb to less than 10Mb. And sometimes it drops to less than 1Mb. IE .2Mb and stays there. Centrurylink says I have too many DHCP reservations and to remove them :-\ or they want me to disconnect every device, turn off WiFi and run a speed test - Hey look it's 20Mb, there's no problem.

    I don't have anything internal that runs on the schedule I'm seeing

    Suggestions? Thoughts as to the cause. Thanks for any advice.

    Each tic mark is 5 minutes. Red is download, green is upload

  2. #2
    Administrator Philip's Avatar
    Join Date
    May 1999
    Jacksonville, Florida, United States
    Blog Entries
    It is possible that there is some periodic interference causing the DSL line to lose sync, or the modem to sync at a lower speed for a bit. I would look into the modem stats page, and see what signal levels you see. There is some basic reference about DSL signal levels here:

    I hope this helps
    Linux is user friendly, it's just picky about its friends...
    Disclaimer: Please use caution when opening messages, my grasp on reality may have shaken loose during transmission (going on rusty memory circuits).

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