ACPI Storm / kworker thread hogging first core

vem_rw
vem_rw New Member Posts: 5 ✭
in UP Squared Pro Linux

Processor: N4200

I have found that there is a kworker thread continually running on the first core, taking somewhere between 80% and 95% of that core.

Investigating this further I found that /sys/firmware/acpi/interrupts/gpe03 was being triggered roughly 5000 times per second.

I am able to mask this interrupt, which releases the kworker thread.

I don't know what generates GPE03, so I don't know if this could now be masking a genuine fault.

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  • vem_rw
    vem_rw New Member Posts: 5 ✭

    Tracked this down to a SimCom modem:

    • Removed modem (and interrupt mask) and issue not present
    • Replace with Sierra Wireless modem and issue not present
    • Replace with another SimCom modem (same model) and issue returned

    Any thoughts on what the root cause may be?

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