OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of system in rack #0, slot #2

Click here to display the system's profile data or here to proceed to next system.

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
Compare latency of primary with shadow system

Characteristics of the 100 highest latencies:

System rack0slot2.osadl.org (updated Fri Sep 11, 2026 12:43:34)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
1366782	2	96	0,1	sleep5	0	-21	swapper/5	09:58:29	5
1006675	2	55	45,7	sleep4	0	-21	swapper/4	07:08:58	4
1006599	2	54	19,30	sleep7	0	-21	swapper/7	07:07:57	7
1007047	99	49	44,4	cyclictest	1589266	-21	kworker/u16:4+flush-8:0	11:39:56	5
1006657	2	48	38,7	sleep5	0	-21	swapper/5	07:08:43	5
1502129	2	42	0,0	sleep7	1502130	-21	ssh	10:52:32	7
1007042	99	39	37,2	cyclictest	1127224	-21	kworker/u16:1+events_unbound	09:49:56	4
1007042	99	38	36,2	cyclictest	1517066	-21	kworker/u16:1+flush-8:0	11:24:56	4
1007042	99	37	34,2	cyclictest	1429457	-21	kworker/u16:2+events_unbound	10:29:59	4
1007047	99	35	32,2	cyclictest	1491210	-21	kworker/u16:5+flush-8:0	10:55:28	5
1007047	99	35	32,2	cyclictest	1491210	-21	kworker/u16:5+flush-8:0	10:55:28	5
1007042	99	34	30,3	cyclictest	1429457	-21	kworker/u16:2+flush-8:0	11:00:06	4
1006542	2	34	10,8	sleep6	0	-21	swapper/6	07:07:08	6
1007042	99	33	31,2	cyclictest	1337197	-21	kworker/u16:0+events_unbound	11:54:07	4
1007042	99	33	30,2	cyclictest	1589215	-21	kworker/u16:2+events_unbound	11:35:06	4
1007047	99	32	30,2	cyclictest	1337197	-21	kworker/u16:0+events_unbound	11:34:56	5
1007053	99	31	26,4	cyclictest	1234296	-21	latency_hist	09:04:57	7
1007047	99	31	29,2	cyclictest	1627282	-21	kworker/u16:5+events_unbound	11:45:18	5
1007047	99	31	28,2	cyclictest	1491210	-21	kworker/u16:5+flush-8:0	10:59:58	5
1007042	99	31	29,2	cyclictest	1234679	-21	kworker/u16:3+events_unbound	09:16:15	4
1007042	99	30	28,2	cyclictest	1562719	-21	kworker/u16:3+events_unbound	11:29:06	4
1007042	99	30	28,2	cyclictest	1429457	-21	kworker/u16:2+events_unbound	10:58:39	4
1007042	99	30	28,2	cyclictest	1429457	-21	kworker/u16:2+events_unbound	10:58:39	4
1007042	99	30	28,2	cyclictest	1137370	-21	kworker/u16:2+events_unbound	08:25:24	4
1007042	99	30	27,2	cyclictest	1127224	-21	kworker/u16:1+events_unbound	09:59:58	4
1007053	99	29	24,4	cyclictest	1528194	-21	latency_hist	11:04:56	7
1007042	99	29	27,2	cyclictest	1367664	-21	kworker/u16:3+events_unbound	10:44:51	4
1007042	99	28	26,2	cyclictest	1701660	-21	kworker/u16:2+events_unbound	12:38:29	4
1007042	99	28	26,2	cyclictest	1701660	-21	kworker/u16:2+events_unbound	12:21:07	4
1007042	99	28	26,2	cyclictest	1627282	-21	kworker/u16:5+events_unbound	12:06:05	4
1007042	99	28	26,2	cyclictest	1627282	-21	kworker/u16:5+events_unbound	11:45:57	4
1007042	99	28	26,2	cyclictest	1337197	-21	kworker/u16:0+events_unbound	12:04:07	4
1007042	99	28	26,2	cyclictest	1127224	-21	kworker/u16:1+events_unbound	08:49:56	4
1402824	2	27	0,1	chrt	1402823	-21	ssh	10:11:45	7
1007047	99	27	25,2	cyclictest	1589266	-21	kworker/u16:4+events_unbound	11:44:56	5
1007047	99	27	25,2	cyclictest	1281599	-21	kworker/u16:4+events_unbound	09:35:38	5
1007047	99	27	25,2	cyclictest	1234679	-21	kworker/u16:3+flush-8:0	09:15:26	5
1007047	99	27	24,3	cyclictest	987446	-21	kworker/u16:0+flush-8:0	07:25:14	5
1007042	99	27	25,2	cyclictest	1404865	-21	kworker/u16:4+flush-8:0	10:16:06	4
1007042	99	27	24,2	cyclictest	1281599	-21	kworker/u16:4+events_unbound	09:34:57	4
1007047	99	26	23,2	cyclictest	1281598	-21	kworker/u16:2+events_unbound	09:25:12	5
1007042	99	26	24,2	cyclictest	1701660	-21	kworker/u16:2+flush-8:0	12:32:17	4
1007042	99	26	24,2	cyclictest	1517066	-21	kworker/u16:1+flush-8:0	11:05:38	4
1007042	99	26	24,2	cyclictest	1491210	-21	kworker/u16:5+events_unbound	10:53:54	4
1007042	99	26	24,2	cyclictest	1429457	-21	kworker/u16:2+events_unbound	10:45:51	4
1007042	99	26	24,2	cyclictest	1127224	-21	kworker/u16:1+flush-8:0	09:53:24	4
1007042	99	26	23,2	cyclictest	1281598	-21	kworker/u16:2+events_unbound	10:05:06	4
1007053	99	25	22,2	cyclictest	162	50	irq/16-ehci_hcd:usb2	11:45:22	7
1007053	99	25	20,4	cyclictest	1127450	-21	latency_hist	08:09:57	7
1007047	99	25	22,3	cyclictest	1030503	-21	kworker/u16:3+flush-8:0	07:50:22	5
1007042	99	25	23,2	cyclictest	1627282	-21	kworker/u16:5+events_unbound	12:13:54	4
1007042	99	25	23,2	cyclictest	1589266	-21	kworker/u16:4+events_unbound	11:32:39	4
1007042	99	25	23,2	cyclictest	1337197	-21	kworker/u16:0+events_unbound	11:11:41	4
1007042	99	25	23,2	cyclictest	1337197	-21	kworker/u16:0+events_unbound	10:25:06	4
1007042	99	25	23,2	cyclictest	1337197	-21	kworker/u16:0+events_unbound	10:24:15	4
1007042	99	25	23,2	cyclictest	1281598	-21	kworker/u16:2+events_unbound	09:44:14	4
1007042	99	25	23,2	cyclictest	1281598	-21	kworker/u16:2+events_unbound	09:25:38	4
1007042	99	25	23,2	cyclictest	1127224	-21	kworker/u16:1+events_unbound	09:31:10	4
1007042	99	25	22,2	cyclictest	1627282	-21	kworker/u16:5+flush-8:0	12:24:57	4
1007042	99	25	21,3	cyclictest	1614988	-21	kworker/u16:3+events_unbound	11:55:20	4
1007042	99	24	22,2	cyclictest	1367664	-21	kworker/u16:3+flush-8:0	10:35:58	4
1007042	99	24	22,2	cyclictest	1337197	-21	kworker/u16:0+events_unbound	10:12:46	4
1007042	99	24	22,2	cyclictest	1006807	-21	kworker/u16:2+events_unbound	07:15:21	4
1007053	99	23	0,21	cyclictest	645	-21	systemd-journal	10:39:56	7
1007053	99	23	0,21	cyclictest	1256347	-21	latency_hist	09:14:57	7
1007042	99	23	21,2	cyclictest	1551453	-21	kworker/u16:2+events_unbound	11:15:06	4
1007042	99	23	21,2	cyclictest	1127224	-21	kworker/u16:1+events_unbound	09:56:03	4
1007042	99	23	21,2	cyclictest	1127224	-21	kworker/u16:1+events_unbound	09:24:10	4
1007047	99	22	20,2	cyclictest	1367664	-21	kworker/u16:3+events_unbound	10:25:24	5
1007047	99	22	20,2	cyclictest	1127224	-21	kworker/u16:1+events_unbound	09:50:27	5
1007047	99	22	19,2	cyclictest	1664341	-21	kworker/u16:1+flush-8:0	12:15:13	5
1007047	99	22	19,2	cyclictest	1614988	-21	kworker/u16:3+flush-8:0	11:50:02	5
1007042	99	22	20,2	cyclictest	1664341	-21	kworker/u16:1+events_unbound	12:16:30	4
1007042	99	22	20,2	cyclictest	1234679	-21	kworker/u16:3+events_unbound	09:10:43	4
1007042	99	22	18,3	cyclictest	1147283	-21	kworker/u16:0+flush-8:0	08:20:16	4
1007042	99	21	19,2	cyclictest	968238	-21	kworker/u16:4+flush-8:0	07:10:22	4
1007042	99	21	19,2	cyclictest	1612278	-21	kworker/u16:1+events_unbound	11:41:02	4
1007047	99	20	19,1	cyclictest	1337197	-21	kworker/u16:0+events_unbound	12:00:13	5
1007047	99	20	18,2	cyclictest	987446	-21	kworker/u16:0+flush-8:0	07:30:12	5
1007047	99	20	18,2	cyclictest	1429457	-21	kworker/u16:2+flush-8:0	10:45:17	5
1007047	99	20	18,2	cyclictest	1429457	-21	kworker/u16:2+flush-8:0	10:40:39	5
1007047	99	20	18,2	cyclictest	1337197	-21	kworker/u16:0+events_unbound	11:58:33	5
1007042	99	20	18,2	cyclictest	1137370	-21	kworker/u16:2+events_unbound	08:55:14	4
1007042	99	20	18,2	cyclictest	1137370	-21	kworker/u16:2+events_unbound	08:55:14	4
1007042	99	20	18,2	cyclictest	1030503	-21	kworker/u16:3+events_unbound	07:48:34	4
1007047	99	19	18,1	cyclictest	1701660	-21	kworker/u16:2+events_unbound	12:35:25	5
1007047	99	19	17,2	cyclictest	1491210	-21	kworker/u16:5+flush-8:0	10:50:24	5
1007047	99	19	17,2	cyclictest	1337197	-21	kworker/u16:0+flush-8:0	12:10:17	5
1007042	99	19	17,2	cyclictest	1030503	-21	kworker/u16:3+flush-8:0	07:30:26	4
1007053	99	18	13,4	cyclictest	1367628	-21	latency_hist	09:59:57	7
1007053	99	18	0,17	cyclictest	0	-21	swapper/7	10:25:18	7
1007053	99	18	0,16	cyclictest	1274	-21	snmpd	09:36:37	7
1007047	99	18	16,2	cyclictest	1337197	-21	kworker/u16:0+events_unbound	10:38:35	5
1007047	99	18	16,2	cyclictest	1281598	-21	kworker/u16:2+events_unbound	10:05:24	5
1007047	99	18	16,2	cyclictest	1281598	-21	kworker/u16:2+events_unbound	10:00:54	5
1007047	99	18	16,2	cyclictest	1098249	-21	kworker/u16:4+events_unbound	08:40:15	5
1007053	99	17	15,1	cyclictest	1088492	-21	awk	07:49:57	7
1007053	99	17	12,4	cyclictest	645	-21	systemd-journal	12:14:56	7
1007053	99	17	12,4	cyclictest	645	-21	systemd-journal	08:09:57	7
1007047	99	17	15,2	cyclictest	987446	-21	kworker/u16:0+flush-8:0	07:24:57	5
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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