[Accton][202012br] Fix high CPU utilization caused by chassis.get_change_event() #8900
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* correct the wait and timeout mechanism for better CPU usage. * Models: AS7726-32X, AS5835-54X Signed-off-by: Sean Wu <sean_wu@edge-core.com>
5 tasks
* The original design will use 'docker' to check operating environment. But that command might get stuck occasionally when it is called in the context of 'determine-reboot-cause.service'. It is suspetced the reason why it gets stucked is related to the service status of 'containerd'. * Change to use 'which systemctl' to check operation environment. When systemctl exists, returns 0. (In Host os env) When it does not exist, returns 1. (In docker os env) Signed-off-by: Sean Wu <sean_wu@edge-core.com>
5 tasks
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Models: as5835-54x, as7726-32x
Why I did it
Correct get_change_event() wait and timeout mechanism to avoid high CPU utilization.
How I did it
Make sure get_change_event() behaves as documentation said, it can block the caller and handle timeout appropriately.
How to verify it
In pmon,
topto measure CPU usage of xcvrd. Make a comparison to confirm the improvement on CPU usage.Which release branch to backport (provide reason below if selected)
Description for the changelog
[Accton] Fix xcvrd busy issue
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