High system/user cpu usage

TAPTech
TAPTech Posts: 167  Master Member
First Comment Friend Collector Sixth Anniversary Nebula Gratitude
in Security

I've noticed for the past 3 days that my ATP500 is showing 95% cpu usage in the Nebula dashboard. I've rebooted it twice, but there has been no change. One of the reboots was done through SSH command.

These are the results I get when running cpu usage query:

image.png

Does anyone have an idea of what processes might be running under "user" that would cause so much cpu usage?

All Replies

  • TAPTech
    TAPTech Posts: 167  Master Member
    First Comment Friend Collector Sixth Anniversary Nebula Gratitude

    Looking through the logs, I found a client had connected to our network which was exceeding the 2500 session limit. Oddly enough, increasing that session limit to 3500 allowed the traffic to flow and the CPU usage went back down to about 10%.

    I find that behavior to be odd- wouldn't blocking the traffic use less cpu than allowing it..?

  • Zyxel_Kevin
    Zyxel_Kevin Posts: 888  Zyxel Employee
    Zyxel Certified Network Administrator - Security Zyxel Certified Sales Associate 100 Answers 500 Comments

    Hi @TAPTech ,

    Greeting Forum,

    Please kindly try to disable content filter to check if any improvement.

    And please provide your Org/Site by Private message.

    Kevin

  • TAPTech
    TAPTech Posts: 167  Master Member
    First Comment Friend Collector Sixth Anniversary Nebula Gratitude
    edited January 30
    https://community.zyxel.com/en/discussion/comment/59975#Comment_59975

    Hi Kevin,

    This issue has reappeared for me today and I have disabled the DNS/URL filter, and the CPU usage is greatly reduced. There is only about 25mbps of traffic flowing, and 8000 sessions when this happens. Do you have any clues as to what could cause such high CPU usage?

  • Zoeypenelope
    Zoeypenelope Posts: 1
    First Comment

    If a system is idle, the OS creates a process called the System Idle Process to prevent the system from shutting off. This process appears to show high CPU usage, but it actually indicates the percentage of CPU capacity not being used.If a system is idle, the OS creates a process called the System Idle Process to prevent sign language alphabet the system from shutting off. This process appears to show high CPU usage, but it actually indicates the percentage of CPU capacity not being used. CPUs perform logic, control, arithmetic, input and output operations specified by its programming to perform basic tasks. They're found in most electronic devices, including laptop computers, smartphones, some cameras, thermostats and any other type of device that requires input and output programming operations.


  • Zyxel_Kevin
    Zyxel_Kevin Posts: 888  Zyxel Employee
    Zyxel Certified Network Administrator - Security Zyxel Certified Sales Associate 100 Answers 500 Comments

    Hi @TAPTech ,

    We already address the issue and will fix in next official version.

    Thank you.

  • TAPTech
    TAPTech Posts: 167  Master Member
    First Comment Friend Collector Sixth Anniversary Nebula Gratitude
    https://community.zyxel.com/en/discussion/comment/61684#Comment_61684

    Thanks Kevin, I am glad to hear that. If my CPU usage is stuck at 99%, should I disable the Content/DNS filtering until the fix is released?

  • Zyxel_Kevin
    Zyxel_Kevin Posts: 888  Zyxel Employee
    Zyxel Certified Network Administrator - Security Zyxel Certified Sales Associate 100 Answers 500 Comments

    Hi @TAPTech ,

    Please kindly share your Nebula Org/Site by Private message and availalbe time.

    I can push the patch firmware when your available time.

    Thank you

  • TheSecondComing
    TheSecondComing Posts: 3
    First Comment Friend Collector First Anniversary

    Hey Kevin,

    I also have this issue with a ATP100, I currently have a ticket in with support with no results yet and still causing issues. when I run the debug show system status my 'user' catagory is at 88% and this causes the overall CPU 99%. ticket 416015

  • Zyxel_Kevin
    Zyxel_Kevin Posts: 888  Zyxel Employee
    Zyxel Certified Network Administrator - Security Zyxel Certified Sales Associate 100 Answers 500 Comments

    Hi @TheSecondComing ,

    I need the detail for issue tracking.

    Please find the message inbox.

    Thank you

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