USG FLEX 100H - CPU usage 20% in idle

szn
szn Posts: 16  Freshman Member
First Comment Friend Collector
in USG FLEX H Series

Hi,

Is this expected behavior that CPU utilisation is constantly around 20% for device that just sitting on the table - no devices behined, just connection to the internet? This is seen in device dashboard.

Simon

Accepted Solution

  • Zyxel_Melen
    Zyxel_Melen Posts: 2,584  Zyxel Employee
    Zyxel Certified Network Engineer Level 1 - Switch Zyxel Certified Network Administrator - Switch Zyxel Certified Network Administrator - Nebula Zyxel Certified Sales Associate
    Answer ✓

    Hi @kruess & @szn,

    This is because USG FLEX H collects and statistics the traffic/process/CPU usage date in the background, which is different from the USG FLEX/ATP series, which disables those by default.

    In addition, cpu_core_list 1 & 2 are for management only. It won't affect data traffic.

    Zyxel Melen


All Replies

  • Zyxel_Melen
    Zyxel_Melen Posts: 2,584  Zyxel Employee
    Zyxel Certified Network Engineer Level 1 - Switch Zyxel Certified Network Administrator - Switch Zyxel Certified Network Administrator - Nebula Zyxel Certified Sales Associate

    Hi @szn,

    This is normal. The firewall runs many feature daemons by default, so the CPU utilization will not be 0%.

    Zyxel Melen


  • kruess
    kruess Posts: 18  Freshman Member
    First Comment First Answer Friend Collector Third Anniversary

    Not really what the endusers would expect from an idle device.

    USG/ATP's with current load usually do not more than spike above 10-15% and having them really idle they are somewhere below 5% CPU usage.

    Combine these high idle usage patterns (our 100H was more around 30-35% on idle!) with the various reports of really slow or maxing out H models (even the bigger 200 & 700 H's!) and do your math…. ☠️

  • PeterUK
    PeterUK Posts: 3,461  Guru Member
    100 Answers 2500 Comments Friend Collector Seventh Anniversary

    Or maybe the CPU is so fast they put load on it that slows it down instead of under clocking it?

  • szn
    szn Posts: 16  Freshman Member
    First Comment Friend Collector

    Hi, I've checked

    show diagnostics cpu all

    and 40% utilisation on each core seems not to be normal. I've never seen this on any idle device. Is there something more to be checked?

    image.png

  • Zyxel_Melen
    Zyxel_Melen Posts: 2,584  Zyxel Employee
    Zyxel Certified Network Engineer Level 1 - Switch Zyxel Certified Network Administrator - Switch Zyxel Certified Network Administrator - Nebula Zyxel Certified Sales Associate
    Answer ✓

    Hi @kruess & @szn,

    This is because USG FLEX H collects and statistics the traffic/process/CPU usage date in the background, which is different from the USG FLEX/ATP series, which disables those by default.

    In addition, cpu_core_list 1 & 2 are for management only. It won't affect data traffic.

    Zyxel Melen


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