vrouter-agent continously hogs CPU with flow_cache_timeout of 1200

[Vedamurthy Joshi]

Set flow_cache_timeout of 1200 for some flow related testing and restarted vrouter-agent

It is seen that contrail-vrouter-agent continuously hogs CPU forever
If i reduce it to 600, then things are fine

root@nodek1:/var/log/contrail# top

top - 03:40:15 up 19:45, 5 users, load average: 25.58, 25.45, 24.48
Tasks: 411 total, 2 running, 409 sleeping, 0 stopped, 0 zombie
%Cpu(s): 9.8 us, 2.2 sy, 0.0 ni, 87.9 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem: 13166488+total, 2983164 used, 12868172+free, 146820 buffers
KiB Swap: 13410713+total, 0 used, 13410713+free. 714340 cached Mem

  PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
25944 root 20 0 2497396 76840 37964 R 2721 0.1 345:58.34 contrail-vroute
  124 root 20 0 0 0 0 S 6.3 0.0 0:27.13 ksoftirqd/10
  174 root 20 0 0 0 0 S 6.3 0.0 0:26.93 ksoftirqd/20
27638 root 20 0 23940 3140 2452 R 6.3 0.0 0:00.01 top
    1 root 20 0 33644 4112 2616 S 0.0 0.0 0:08.99 init
    2 root 20 0 0 0 0 S 0.0 0.0 0:00.01 kthreadd
    3 root 20 0 0 0 0 S 0.0 0.0 0:26.23 ksoftirqd/0

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/14408
Submitter: Ashok Singh (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/14408
Committed: http://github.org/Juniper/contrail-controller/commit/e51bdabe676866b74feeadf8cd8b94b1896bd411
Submitter: Zuul
Branch: R2.20

commit e51bdabe676866b74feeadf8cd8b94b1896bd411
Author: Ashok Singh <email address hidden>
Date: Tue Oct 13 21:24:36 2015 -0700

Fix cpu hog of contrail-vrouter-agent caused by setting flow_cache_timeout to high values.

The high value of flow_cache_timeout when used to compute the flow timer interval, does not
fit in uint32 field. We need to interpret the value as uint64 instead of uint32.
Closes-Bug: #1505615

Change-Id: Ie48e6ced9191a10a14f68112cd94d64cc50bc2f0

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/14498
Submitter: Ashok Singh (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/14498
Committed: http://github.org/Juniper/contrail-controller/commit/a09b4a2279c1014ea68276483cec874915295206
Submitter: Zuul
Branch: master

commit a09b4a2279c1014ea68276483cec874915295206
Author: Ashok Singh <email address hidden>
Date: Fri Oct 16 11:13:33 2015 -0700

Fix cpu hog of contrail-vrouter-agent caused by setting flow_cache_timeout to high values.

The high value of flow_cache_timeout when used to compute the flow timer interval, does not
fit in uint32 field. We need to interpret the value as uint64 instead of uint32.
Closes-Bug: #1505615

Change-Id: I4d705b26d5638448078f3eec0e3d5e9e8878d550