FIO Latency and IOPS variation with blktrace

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HI,

When fio is run with blktrace,
IOPS drops by 8%, average clat increased by 9% and max clat is5 times
more compared to the test run without running blktrace.

Is this expected overhead when blktrace is run?
Wondering why max latency is 5 time more!!

Regards,
Gruu
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