What is the meaning of the (72% CPU usage) lines in ovs-vswitchd.log ?

Issue

• We are getting high cpu utilization message from /var/log/openvswitch/ovs-vswitchd.log but controllers cpu utilization is normal. For more please check below logs:

2019-07-23T10:25:49.601Z|03376|coverage|INFO|47 events never hit
2019-07-23T10:25:50.663Z|03377|poll_loop|INFO|Dropped 3 log messages in last 2169 seconds (most recently, 2168 seconds ago) due to excessive rate
2019-07-23T10:25:50.664Z|03378|poll_loop|INFO|wakeup due to [POLLIN] on fd 458 (FIFO pipe:[3640441943]) at vswitchd/bridge.c:384 (72% CPU usage)
2019-07-23T10:25:51.163Z|03379|poll_loop|INFO|wakeup due to [POLLIN] on fd 458 (FIFO pipe:[3640441943]) at vswitchd/bridge.c:384 (72% CPU usage)
2019-07-23T10:25:51.664Z|03380|poll_loop|INFO|wakeup due to [POLLIN] on fd 458 (FIFO pipe:[3640441943]) at vswitchd/bridge.c:384 (72% CPU usage)
2019-07-23T10:25:52.137Z|03381|poll_loop|INFO|wakeup due to [POLLIN] on fd 306 (127.0.0.1:10900<->127.0.0.1:6633) at lib/stream-fd.c:157 (72% CPU usage)
2019-07-23T10:25:52.138Z|03382|poll_loop|INFO|wakeup due to [POLLIN] on fd 306 (127.0.0.1:10900<->127.0.0.1:6633) at lib/stream-fd.c:157 (72% CPU usage)
2019-07-23T10:25:52.164Z|03383|poll_loop|INFO|wakeup due to [POLLIN] on fd 458 (FIFO pipe:[3640441943]) at vswitchd/bridge.c:384 (72% CPU usage)
2019-07-23T10:25:52.664Z|03384|poll_loop|INFO|wakeup due to [POLLIN] on fd 458 (FIFO pipe:[3640441943]) at vswitchd/bridge.c:384 (72% CPU usage)
2019-07-23T10:25:53.164Z|03385|poll_loop|INFO|wakeup due to [POLLIN] on fd 458 (FIFO pipe:[3640441943]) at vswitchd/bridge.c:384 (72% CPU usage)