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What is the purpose of 62.5kHz timer interrupt?

David Aldrich92784
Genius 3720 points

I have a Linux process that wakes every 1ms to do some processing. I have noticed that there is significant kernel activity 16us after the wake-up, so I guess that there is a 62.5kHz timer interrupt in the system. I think that that timer interrupt is consuming quite a lot of cpu load. I am wondering whether it is configurable and whether I need it.

Please can anyone give me a hint of what this interrupt is for? (I have tried googling it).

  • 0
    Guru 31670 points

    David,

    First of all there is no possibility of a 62.5Khz timer interrupt in the system. If you want to really reduce the CPU load caused by the timer interrupt, you can try to use tickless kernel. You've to set the CONFIG_NO_HZ=y in the kernel config for enabling this feature.