round_jiffies and load average

Simon Arlott
2007-02-24T15:19:32Z

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I've modified the driver of an USB device (cxacru) to schedule the next poll for status every 1s using round_jiffies_relative instead of just waiting 1s since the last poll was completed. This process takes on average 11ms to complete and while it is waiting for a response it's considered running.

The load average is calculated every 5 seconds equivalent to round_jiffies, so I have a problem with the load average always tending towards 1.00:

14:26:19 up 6 days, 14:45, 5 users, load average: 1.10, 1.04, 1.02
14:27:19 up 6 days, 14:46, 5 users, load average: 1.03, 1.03, 1.01
14:28:19 up 6 days, 14:47, 5 users, load average: 0.95, 1.01, 1.00
14:29:19 up 6 days, 14:48, 5 users, load average: 0.90, 0.97, 0.99
14:30:19 up 6 days, 14:49, 5 users, load average: 0.93, 0.96, 0.98
14:31:19 up 6 days, 14:50, 5 users, load average: 0.90, 0.94, 0.97
14:32:20 up 6 days, 14:51, 5 users, load average: 0.96, 0.95, 0.97
14:33:20 up 6 days, 14:52, 5 users, load average: 0.98, 0.95, 0.97
14:34:20 up 6 days, 14:53, 5 users, load average: 1.09, 0.99, 0.98
14:35:20 up 6 days, 14:54, 5 users, load average: 1.03, 0.99, 0.98
14:36:20 up 6 days, 14:55, 5 users, load average: 1.01, 0.99, 0.98
14:37:20 up 6 days, 14:56, 5 users, load average: 1.00, 0.99, 0.98
14:38:21 up 6 days, 14:57, 5 users, load average: 1.22, 1.05, 1.00
14:39:21 up 6 days, 14:58, 5 users, load average: 1.08, 1.04, 1.00
14:40:21 up 6 days, 14:59, 5 users, load average: 1.03, 1.03, 1.00
14:41:21 up 6 days, 15:00, 5 users, load average: 0.95, 1.01, 0.99
14:42:21 up 6 days, 15:01, 5 users, load average: 0.90, 0.97, 0.98
14:43:21 up 6 days, 15:02, 5 users, load average: 0.99, 0.99, 0.99
14:44:22 up 6 days, 15:03, 5 users, load average: 0.86, 0.94, 0.97
14:45:22 up 6 days, 15:04, 5 users, load average: 0.97, 0.95, 0.97
14:46:22 up 6 days, 15:05, 5 users, load average: 1.08, 0.99, 0.98
14:47:22 up 6 days, 15:06, 5 users, load average: 1.03, 0.99, 0.98
14:48:22 up 6 days, 15:07, 5 users, load average: 1.32, 1.07, 1.01

Perhaps the load average count could be run just before or in the middle of a second instead?

--
Simon Arlott

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