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Default latency plot of system in rack #b, slot #1

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Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.
Data to construct the above plot have been generated using the RT test utility cyclictest.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance

Characteristics of the 50 highest latencies:

System rackbslot1.osadl.org (updated Mon Dec 15, 2025 12:44:45)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
1098758	2	207	160,14	sleep2	0	-21	swapper/2	07:09:10	2
1098522	2	197	167,20	sleep1	0	-21	swapper/1	07:06:12	1
1098593	2	195	172,13	sleep3	0	-21	swapper/3	07:07:06	3
1098814	2	191	168,13	sleep0	0	-21	swapper/0	07:09:51	0
1099028	99	71	65,4	cyclictest	1399412	-21	/usr/share/muni	12:00:04	0
1099032	99	67	64,3	cyclictest	1187244	-21	kworker/u8:4+flush-179:0	08:45:12	1
1099033	99	66	62,3	cyclictest	1130743	-21	kworker/u8:1+events_unbound	08:20:29	2
1099033	99	66	62,3	cyclictest	1130743	-21	kworker/u8:1+events_unbound	08:20:29	2
1099033	99	64	60,3	cyclictest	1337155	-21	kworker/u8:4+flush-179:0	11:30:14	2
1099033	99	63	58,3	cyclictest	1098766	-21	kworker/u8:2+flush-179:0	07:15:34	2
1099038	99	60	54,4	cyclictest	1316479	-21	latency_hist	10:40:01	3
1099032	99	59	56,2	cyclictest	1130743	-21	kworker/u8:1+flush-179:0	07:40:15	1
1099032	99	59	55,3	cyclictest	1258875	-21	kworker/u8:0+events_unbound	09:50:32	1
1099028	99	59	56,2	cyclictest	979178	-21	kworker/u8:0+events_unbound	07:15:02	0
1099033	99	58	54,2	cyclictest	979178	-21	kworker/u8:0+events_unbound	07:50:00	2
1099033	99	58	36,21	cyclictest	979178	-21	kworker/u8:0+flush-179:0	07:45:00	2
1099028	99	58	54,3	cyclictest	1394973	-21	kworker/u8:0+flush-179:0	12:20:16	0
1099033	99	57	52,4	cyclictest	1151656	-21	munin-update	08:00:33	2
1099032	99	57	53,3	cyclictest	1337153	-21	kworker/u8:2+events_unbound	11:15:30	1
1099032	99	56	52,3	cyclictest	1285496	-21	kworker/u8:0+events_unbound	10:15:17	1
1099038	99	55	51,2	cyclictest	1136487	-21	snmp_wlanpowerc	07:45:02	3
1099038	99	55	50,3	cyclictest	1187244	-21	kworker/u8:4+flush-179:0	09:25:15	3
1099033	99	55	48,6	cyclictest	3125724	-21	ThreadPoolForeg	12:35:10	2
1099032	99	55	52,2	cyclictest	1120019	-21	kworker/u8:4+flush-179:0	07:30:14	1
1099032	99	55	52,2	cyclictest	1120019	-21	kworker/u8:4+flush-179:0	07:30:14	1
1099028	99	55	52,2	cyclictest	1337153	-21	kworker/u8:2+flush-179:0	11:20:10	0
1099032	99	54	51,2	cyclictest	247562	-13	Chrome_ChildIOT	07:45:02	1
1099028	99	54	52,2	cyclictest	1394973	-21	kworker/u8:0+events_unbound	12:05:10	0
1099038	99	53	49,3	cyclictest	979178	-21	kworker/u8:0+flush-179:0	07:55:31	3
1099032	99	52	48,3	cyclictest	1419256	-21	kworker/u8:1+flush-179:0	12:25:25	1
1099032	99	52	47,4	cyclictest	1404491	-21	/usr/share/muni	12:05:04	1
1099032	99	52	37,2	cyclictest	1176881	-21	kworker/u8:2+flush-179:0	08:30:21	1
1099033	99	51	46,4	cyclictest	1383923	-21	/usr/share/muni	11:45:24	2
1099032	99	51	49,2	cyclictest	1398305	-21	kworker/u8:2+events_unbound	12:00:11	1
1099032	99	51	48,2	cyclictest	1300906	-21	kworker/u8:4+events_unbound	10:25:34	1
1099032	99	51	48,2	cyclictest	1245834	-21	kworker/u8:3+flush-179:0	10:46:20	1
1416326	2	50	0,2	sleep0	3125728	-13	Compositor	12:15:17	0
1099038	99	50	46,3	cyclictest	1305902	-21	kworker/u8:5+flush-179:0	11:25:14	3
1099038	99	50	44,4	cyclictest	247561	-21	ThreadPoolForeg	11:10:29	3
1099033	99	50	46,3	cyclictest	1156425	-21	kworker/u8:3+flush-179:0	08:25:31	2
1099033	99	50	46,3	cyclictest	1115291	-21	kworker/u8:2+flush-179:0	07:25:16	2
1099032	99	50	47,2	cyclictest	1398305	-21	kworker/u8:2+events_unbound	12:15:30	1
1099032	99	50	46,3	cyclictest	979178	-21	kworker/u8:0+events_unbound	07:20:32	1
1099032	99	50	46,3	cyclictest	1388109	-21	kworker/u8:4+flush-179:0	12:10:22	1
1099028	99	50	45,4	cyclictest	1197659	-21	latency_hist	08:45:01	0
1099028	99	50	43,5	cyclictest	1280929	-21	/usr/share/muni	10:05:06	0
1099038	99	49	46,2	cyclictest	1305902	-21	kworker/u8:5+events_unbound	10:55:00	3
1099033	99	49	44,4	cyclictest	1234353	-21	/usr/share/muni	09:20:16	2
1099032	99	49	46,3	cyclictest	1388109	-21	kworker/u8:4+events_unbound	11:55:01	1
1099032	99	49	46,2	cyclictest	1368031	-21	kworker/u8:3+flush-179:0	11:48:31	1
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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This page was last modified on 2019-05-28 - 00:17