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Altera_Forum
Honored Contributor
Honored ContributorARM PMU cycle counter not always incrementing at CPU frequency
Hello, I want to benchmark my program running on Linux on an Altera Cyclone V SoC board, but it turns out that the values returned from the ARM PMU cycle counter suggest that some sort of CPU f...
Altera_ForumHonored Contributor
Honored ContributorI already got the answer: Linux uses the WFI instruction to put the core into standby, during which the cycle count will not increase. The kernel parameter nohlt will disable WFI.
http://community.arm.com/message/29414#29414
