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 Tue Apr 14, 2026 00:43:34)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
639211	2	59	49,7	sleep6	0	-21	swapper/6	18:57:38	6
639797	99	57	53,3	cyclictest	710435	-21	kworker/u16:2+flush-8:0	20:11:49	5
639456	2	55	45,7	sleep5	0	-21	swapper/5	19:01:06	5
639793	99	53	51,2	cyclictest	1135156	-21	kworker/u16:4+events_unbound	23:31:48	4
639455	2	53	43,7	sleep4	0	-21	swapper/4	19:01:05	4
639807	99	50	46,2	cyclictest	1207987	-21	/usr/sbin/munin	23:21:49	7
639807	99	46	43,2	cyclictest	124	-21	kswapd0	23:06:49	7
639797	99	44	40,3	cyclictest	956979	-21	kworker/u16:4+flush-8:0	21:51:49	5
636955	2	44	3,34	sleep7	0	-21	swapper/7	18:57:15	7
639807	99	40	35,4	cyclictest	872946	-21	latency_hist	21:01:49	7
639793	99	40	39,1	cyclictest	1028454	-21	kworker/u16:0+events_unbound	22:58:40	4
639793	99	40	38,2	cyclictest	1135156	-21	kworker/u16:4+flush-8:0	23:16:49	4
639797	99	39	37,2	cyclictest	863361	-21	kworker/u16:2+flush-8:0	21:16:44	5
639797	99	39	35,3	cyclictest	1028454	-21	kworker/u16:0+flush-8:0	22:22:08	5
639807	99	38	34,2	cyclictest	1277132	-21	sed	23:47:19	7
639807	99	38	33,4	cyclictest	1052333	-21	latency_hist	22:16:49	7
639805	99	37	35,2	cyclictest	992561	-21	kworker/u16:2+events_unbound	22:41:44	6
639805	99	37	35,2	cyclictest	739447	-21	kworker/u16:0+events_unbound	19:52:04	6
639797	99	37	35,2	cyclictest	1028454	-21	kworker/u16:0+flush-8:0	23:27:11	5
639793	99	37	35,2	cyclictest	4131780	-21	kworker/u16:5+events_unbound	19:07:13	4
639805	99	34	32,2	cyclictest	739447	-21	kworker/u16:0+events_unbound	20:17:03	6
639805	99	34	32,2	cyclictest	739447	-21	kworker/u16:0+events_unbound	20:17:03	6
639797	99	34	32,2	cyclictest	992561	-21	kworker/u16:2+events_unbound	23:02:03	5
1016508	2	33	0,1	chrt	0	-21	swapper/4	22:01:49	4
639793	99	32	29,3	cyclictest	956589	-21	kworker/u16:1+flush-8:0	22:46:44	4
639807	99	30	29,0	cyclictest	0	-21	swapper/7	20:17:11	7
639807	99	30	29,0	cyclictest	0	-21	swapper/7	20:17:11	7
639807	99	29	0,27	cyclictest	650	-21	systemd-journal	20:46:49	7
639805	99	29	27,2	cyclictest	1240909	-21	kworker/u16:5+events_unbound	23:46:43	6
639797	99	29	27,2	cyclictest	921110	-21	kworker/u16:3+flush-8:0	21:26:44	5
639807	99	28	23,4	cyclictest	650	-21	systemd-journal	22:46:50	7
639805	99	28	26,2	cyclictest	806406	-21	kworker/u16:1+events_unbound	20:37:19	6
639797	99	28	26,2	cyclictest	739447	-21	kworker/u16:0+events_unbound	20:17:13	5
639797	99	28	26,2	cyclictest	739447	-21	kworker/u16:0+events_unbound	20:17:13	5
639807	99	27	22,4	cyclictest	863348	-21	latency_hist	20:56:49	7
639797	99	27	25,2	cyclictest	992561	-21	kworker/u16:2+flush-8:0	23:17:20	5
639793	99	27	25,2	cyclictest	1281054	-21	kworker/u16:3+flush-8:0	23:56:44	4
639793	99	27	24,3	cyclictest	610129	-21	kworker/u16:2+flush-8:0	19:06:50	4
639797	99	26	24,2	cyclictest	992561	-21	kworker/u16:2+flush-8:0	22:32:12	5
639797	99	26	24,2	cyclictest	1314116	-21	kworker/u16:1+flush-8:0	00:21:44	5
639793	99	26	23,2	cyclictest	710435	-21	kworker/u16:2+flush-8:0	20:32:20	4
947672	2	25	0,1	sleep4	947673	-21	kthreadcore	21:32:08	4
639807	99	25	23,1	cyclictest	0	-21	swapper/7	19:47:08	7
639807	99	25	21,3	cyclictest	1372413	-21	ntpq	00:27:16	7
639805	99	25	23,2	cyclictest	992561	-21	kworker/u16:2+events_unbound	22:58:44	6
639805	99	24	22,2	cyclictest	806406	-21	kworker/u16:1+events_unbound	21:11:05	6
639805	99	24	22,2	cyclictest	4131780	-21	kworker/u16:5+events_unbound	19:06:55	6
639805	99	24	22,2	cyclictest	1253570	-21	kworker/u16:1+events_unbound	23:40:51	6
639797	99	24	22,2	cyclictest	956979	-21	kworker/u16:4+flush-8:0	21:46:44	5
639805	99	23	21,2	cyclictest	956979	-21	kworker/u16:4+events_unbound	21:57:40	6
639805	99	23	21,2	cyclictest	691448	-21	kworker/u16:1+events_unbound	19:47:11	6
639793	99	23	21,2	cyclictest	739447	-21	kworker/u16:0+events_unbound	20:52:02	4
639793	99	23	20,2	cyclictest	921110	-21	kworker/u16:3+flush-8:0	21:42:05	4
639807	99	22	0,21	cyclictest	1305219	-21	sed	00:02:05	7
639805	99	22	20,2	cyclictest	992561	-21	kworker/u16:2+events_unbound	22:45:35	6
639805	99	22	20,2	cyclictest	956979	-21	kworker/u16:4+events_unbound	21:45:19	6
639805	99	22	20,2	cyclictest	863733	-21	kworker/u16:4+events_unbound	21:05:51	6
639805	99	22	20,2	cyclictest	806406	-21	kworker/u16:1+events_unbound	21:21:48	6
639805	99	22	20,2	cyclictest	1281054	-21	kworker/u16:3+events_unbound	00:04:24	6
639807	99	21	20,0	cyclictest	0	-21	swapper/7	23:06:51	7
639807	99	21	20,0	cyclictest	0	-21	swapper/7	21:36:51	7
639807	99	21	20,0	cyclictest	0	-21	swapper/7	21:36:51	7
639807	99	21	20,0	cyclictest	0	-21	swapper/7	19:56:44	7
639807	99	21	15,5	cyclictest	932642	-21	latency_hist	21:26:50	7
639807	99	21	0,20	cyclictest	1075625	-21	sh	22:25:35	7
639805	99	21	19,2	cyclictest	956979	-21	kworker/u16:4+events_unbound	21:54:20	6
639805	99	21	19,2	cyclictest	956589	-21	kworker/u16:1+events_unbound	22:08:19	6
639805	99	21	19,2	cyclictest	921110	-21	kworker/u16:3+events_unbound	21:41:19	6
639805	99	21	19,2	cyclictest	921110	-21	kworker/u16:3+events_unbound	21:41:19	6
639805	99	21	19,2	cyclictest	921110	-21	kworker/u16:3+events_unbound	21:32:19	6
639805	99	21	19,2	cyclictest	1281054	-21	kworker/u16:3+events_unbound	00:22:05	6
639805	99	21	19,2	cyclictest	1280271	-21	kworker/u16:2+events_unbound	23:59:35	6
639805	99	21	19,2	cyclictest	1135156	-21	kworker/u16:4+events_unbound	23:16:14	6
639805	99	21	19,2	cyclictest	1135156	-21	kworker/u16:4+events_unbound	22:50:51	6
639805	99	21	19,2	cyclictest	1028454	-21	kworker/u16:0+events_unbound	23:20:00	6
639797	99	21	18,3	cyclictest	863361	-21	kworker/u16:2+flush-8:0	21:02:06	5
639793	99	21	18,2	cyclictest	691448	-21	kworker/u16:1+flush-8:0	19:47:13	4
639807	99	20	14,5	cyclictest	1064325	-21	latency_hist	22:21:49	7
639807	99	20	14,5	cyclictest	1064325	-21	latency_hist	22:21:49	7
639805	99	20	18,2	cyclictest	691448	-21	kworker/u16:1+events_unbound	19:46:12	6
639797	99	20	18,2	cyclictest	992561	-21	kworker/u16:2+flush-8:0	22:07:21	5
639797	99	20	18,2	cyclictest	681340	-21	kworker/u16:0+flush-8:0	19:22:15	5
639793	99	20	19,1	cyclictest	1028454	-21	kworker/u16:0+flush-8:0	23:37:21	4
639793	99	20	18,2	cyclictest	992561	-21	kworker/u16:2+flush-8:0	22:47:05	4
639793	99	20	18,2	cyclictest	956979	-21	kworker/u16:4+events_unbound	22:02:08	4
639793	99	20	18,2	cyclictest	691448	-21	kworker/u16:1+events_unbound	19:32:14	4
639793	99	20	18,2	cyclictest	691448	-21	kworker/u16:1+events_unbound	19:32:14	4
639805	99	19	17,2	cyclictest	992561	-21	kworker/u16:2+events_unbound	22:53:31	6
639805	99	19	17,2	cyclictest	992561	-21	kworker/u16:2+events_unbound	22:32:48	6
639805	99	19	17,2	cyclictest	992561	-21	kworker/u16:2+events_unbound	22:19:17	6
639805	99	19	17,2	cyclictest	992561	-21	kworker/u16:2+events_unbound	22:19:17	6
639805	99	19	17,2	cyclictest	863361	-21	kworker/u16:2+events_unbound	21:28:27	6
639805	99	19	17,2	cyclictest	758386	-21	kworker/u16:3+events_unbound	20:16:00	6
639805	99	19	17,2	cyclictest	1281054	-21	kworker/u16:3+events_unbound	00:16:19	6
639805	99	19	17,2	cyclictest	1253570	-21	kworker/u16:1+events_unbound	23:50:55	6
639805	99	19	17,2	cyclictest	1028454	-21	kworker/u16:0+events_unbound	23:55:44	6
639797	99	19	17,2	cyclictest	992561	-21	kworker/u16:2+flush-8:0	22:02:16	5
639797	99	19	17,2	cyclictest	1135156	-21	kworker/u16:4+events_unbound	22:52:13	5
639793	99	19	17,2	cyclictest	710435	-21	kworker/u16:2+events_unbound	20:27:09	4
639793	99	19	16,2	cyclictest	739447	-21	kworker/u16:0+events_unbound	20:07:07	4
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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