AnsweredAssumed Answered

i.mx283 usbcore occupies too much CPU time

Question asked by jh qiu on Apr 18, 2017
Latest reply on Apr 24, 2017 by jh qiu

Platform : i.mx283 EVK board, linux 2.6.35

 

2 test cases is followed:

   1. If the kernel config option of "usb" is checked, that is to say, usbcore driver is a built-in driver in the uImage, when the kernel starts up,shell command of "uptime" say "... load average: 2.01, 1.99,1.97" . That is abnormal cpu loadaverage!

   2. If I remove kernel config option of "usb", I build a uImage file without a built-in usb driver. when this kernel starts up, the cpu load average is " load average 0.2, 0.1 ,0.0". there is no problem.

 

By the way, there is no user's applications run on the above 2 tested cases, only kernel runs.

Question:

Anyone meet this problem? What causes this abnormal cpu loadaverage problem?

Outcomes