RE: [PATCH v2 3/3] clocksource: Add clockevent support to NPS400 driver

Noam Camus
2016-11-10T13:01:03Z

>From: Daniel Lezcano [mailto:daniel.lezcano@linaro.org]
>Sent: Thursday, November 10, 2016 12:34 PM

>>> give a correct result without a dmesg log ?
>> [root@192.168.8.2 /]$ [root@192.168.8.2 /]$ taskset 65536 time sleep 2
>> & taskset 131072 time sleep 3

>Thanks for providing the numbers.

>So there is no weird messages in dmesg ?
Yes, no weird messages, all seem normal.

>> real 0m 2.54s
>> user 0m 0.04s
>> sys 0m 0.14s
>> real 0m 3.47s
>> user 0m 0.00s
>> sys 0m 0.15s
>> [1]+ Done taskset 65536 time sleep 2
>>
>> Seem OK to me.

>I'm not sure of that.

>2.54 instead of 2
>3.47 instead of 3

>0.02 time drift could be acceptable but 0.54 or 0.47 is too much.

>And 0.15 in sys also a big number AFAICT.

>Is the system in NO_HZ ?

We are handling system with NOHZ_FULL
This was run under simulation and result are reasonable (indeed not perfect) AFAICT.

-Noam