An abnormal io log appears in bird, and a reload appears in gatekeeper. After reload, many flows were rejected and could not pass.
Sep 29 16:22:20 77-GK-2 bird: I/O loop cycle took 173558 ms for 7 events
Sep 29 16:22:48 77-GK-2 bird: I/O loop cycle took 27523 ms for 5 events
Sep 29 16:23:14 77-GK-2 bird: I/O loop cycle took 20373 ms for 1 events
Sep 29 16:28:21 77-GK-2 bird: I/O loop cycle took 105873 ms for 5 events
Sep 29 16:33:49 77-GK-2 bird: I/O loop cycle took 170328 ms for 7 events
Sep 29 16:37:41 77-GK-2 bird: I/O loop cycle took 48777 ms for 4 events
Sep 29 16:40:43 77-GK-2 bird: I/O loop cycle took 13872 ms for 2 events
Sep 29 16:45:10 77-GK-2 bird: I/O loop cycle took 119808 ms for 6 events
Sep 29 16:50:41 77-GK-2 bird: I/O loop cycle took 188279 ms for 7 events
Sep 29 16:54:44 77-GK-2 bird: I/O loop cycle took 101038 ms for 6 events
Sep 29 16:59:48 77-GK-2 bird: I/O loop cycle took 62101 ms for 5 events
Sep 29 17:01:02 77-GK-2 bird: I/O loop cycle took 74442 ms for 6 events
Sep 29 17:06:04 77-GK-2 bird: I/O loop cycle took 98967 ms for 6 events
Sep 29 17:11:12 77-GK-2 bird: I/O loop cycle took 173759 ms for 7 events
Sep 29 17:13:35 77-GK-2 bird: I/O loop cycle took 12505 ms for 4 events
Sep 29 17:16:24 77-GK-2 bird: I/O loop cycle took 80281 ms for 5 events
Sep 29 17:21:54 77-GK-2 bird: I/O loop cycle took 124891 ms for 6 events
Sep 29 17:22:27 77-GK-2 bird: I/O loop cycle took 23494 ms for 2 events
Sep 29 17:26:00 77-GK-2 bird: I/O loop cycle took 69845 ms for 5 events
Sep 29 17:31:32 77-GK-2 bird: I/O loop cycle took 34428 ms for 4 events
Sep 29 17:31:57 77-GK-2 bird: I/O loop cycle took 23200 ms for 2 events
Sep 29 17:36:52 77-GK-2 bird: I/O loop cycle took 62082 ms for 5 events
Sep 29 17:37:34 77-GK-2 bird: I/O loop cycle took 30275 ms for 3 events
Sep 29 17:38:09 77-GK-2 bird: I/O loop cycle took 14942 ms for 4 events
Sep 29 17:48:14 77-GK-2 bird: I/O loop cycle took 20316 ms for 4 events