[LTP] poll02 threshold overruns

[Kshitij Malik]

Hi,

I'm working on PowerPc based board MPC8360 and we are running 4.1.13 kernel. During our LTP run, we saw the following failure with poll02 test.

poll02      1  TFAIL  :  poll02.c:92: poll() slept too long 115ms, expected 100ms, threshold 12

The log file is attached to this mail.

Please note that I'm running the latest LTP code.

I understand that threshold value overruns the relax limit. I try changing the threshold value to 20 as below (to give more relaxing time)

testcases/kernel/syscalls/poll/poll02.c, line 61

- treshold = sleep_ms / 100 + 10;
+treshold = sleep_ms / 10 + 10;

I ran the test in a loop until it fails and the test failed after 3 mins at attempt number 240 with the timer value 121ms. Error as below:

poll02      1  TFAIL  :  poll02.c:92: poll() slept too long 121ms, expected 100ms, threshold 20


Can you please look into this and explain the behaviour and a possible solution? Is it a architecture constraint?

Please let me know if you need any other information.

Thanks
KK
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