how long wait_for_completion_interruptible_timeout() blocks

Hi All, I’ve two Linux systems, I tried to measure how long wait_for_completion_interruptible_timeout() blocked after completion is signaled by complete() call. I noticed two different results in both systems. In one system I noticed this duration in between 10 to 60 micro seconds, where as in other system it is in between 20 to 500 micro seconds. I’d like to know what factors can affect this latency? Also, is there any solution to reduce this latency? Thanks,