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Arm11 clock

korner korner
Note: This was originally posted on 13th October 2008 at http://forums.arm.com

Hello,

Does anyone know if there is a timestamp clock in Arm? Something like the RDTSC in intel?
Or some other high frequency clock?
I need a clock to mesure performance of my linux kernel (and I use the RTC for something else).

Thanks everyone!
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  • 0 Arm Employee Badge
    Note: This was originally posted on 13th October 2008 at http://forums.arm.com

    If your SoC wires up the PMIRQ signal to the interrupt controller, you can use the performance monitor cycle counter to generate an interrupt on overflow.

    The performance monitor cycle counter wraps on overflow, so you can measure how long it takes from the time the overflow occured (PMIRQ asserted) to the time that it was serviced.
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  • 0 Arm Employee Badge
    Note: This was originally posted on 13th October 2008 at http://forums.arm.com

    If your SoC wires up the PMIRQ signal to the interrupt controller, you can use the performance monitor cycle counter to generate an interrupt on overflow.

    The performance monitor cycle counter wraps on overflow, so you can measure how long it takes from the time the overflow occured (PMIRQ asserted) to the time that it was serviced.
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