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Cortex A8 Instruction Cycle Timing

barney vardanyan
Note: This was originally posted on 17th March 2011 at http://forums.arm.com

Hi) sorry for bad English

I need to count latency for two instruction, and all I have is the arm cortex A 8 documantation(charter 16) !
but I have no idea how can do this work using that documantation(
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  • 0 Arm Employee Badge
    Note: This was originally posted on 12th April 2011 at http://forums.arm.com


    [color=#222222][size=2]10 NOP instructions on my beagle takes 2.508 s[/size][/color]


    Two questions ...

    (1) Have you turned on the processor caches?
    (2) How are you measuring the time taken?

    Assuming perfect execution then 10 NOP instructions should be around 5 cycles - so 0.01 us ... so, not meaning to be rude, but something is wrong with your setup =)
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  • 0 Arm Employee Badge
    Note: This was originally posted on 12th April 2011 at http://forums.arm.com


    [color=#222222][size=2]10 NOP instructions on my beagle takes 2.508 s[/size][/color]


    Two questions ...

    (1) Have you turned on the processor caches?
    (2) How are you measuring the time taken?

    Assuming perfect execution then 10 NOP instructions should be around 5 cycles - so 0.01 us ... so, not meaning to be rude, but something is wrong with your setup =)
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