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 Nov 21, 2025 12:43:33)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
3599808	2	58	48,7	sleep5	0	-21	swapper/5	15:20:59	5
3703991	2	56	0,1	sleep4	0	-21	swapper/4	16:08:57	4
3599849	2	53	19,30	sleep7	0	-21	swapper/7	15:21:33	7
3599720	2	53	42,8	sleep4	0	-21	swapper/4	15:19:46	4
3600349	99	51	49,2	cyclictest	3816753	-21	kworker/u16:3+events_unbound	17:38:35	6
3600349	99	43	41,2	cyclictest	4038485	-21	kworker/u16:1+flush-8:0	19:13:30	6
3600349	99	43	40,2	cyclictest	4058958	-21	kworker/u16:2+events_unbound	19:19:08	6
3600349	99	41	39,2	cyclictest	3956731	-21	kworker/u16:2+flush-8:0	18:23:35	6
3600349	99	40	37,3	cyclictest	4078191	-21	kworker/u16:0+events_unbound	19:30:12	6
3600349	99	40	37,3	cyclictest	4078191	-21	kworker/u16:0+events_unbound	19:30:12	6
3600340	99	40	38,2	cyclictest	3897058	-21	kworker/u16:0+events_unbound	18:52:06	4
3599791	2	40	30,7	sleep6	0	-21	swapper/6	15:20:44	6
3600340	99	39	37,2	cyclictest	4009248	-21	kworker/u16:4+events_unbound	19:07:07	4
3600353	99	38	0,36	cyclictest	589235	-21	systemd-journal	18:03:35	7
3600353	99	38	0,36	cyclictest	589235	-21	systemd-journal	18:03:35	7
3600340	99	38	36,2	cyclictest	4165774	-21	kworker/u16:3+events_unbound	20:28:07	4
3600340	99	38	36,2	cyclictest	4009248	-21	kworker/u16:4+events_unbound	19:02:06	4
3600340	99	38	36,2	cyclictest	3785012	-21	kworker/u16:5+flush-8:0	16:52:50	4
3600340	99	37	35,2	cyclictest	4078191	-21	kworker/u16:0+events_unbound	19:47:08	4
3600340	99	37	34,2	cyclictest	3755338	-21	kworker/u16:2+flush-8:0	17:13:59	4
3600340	99	37	34,2	cyclictest	3755338	-21	kworker/u16:2+flush-8:0	17:13:59	4
3600353	99	36	31,4	cyclictest	589235	-21	systemd-journal	16:17:07	7
3600353	99	36	31,4	cyclictest	3745506	-21	latency_hist	16:33:35	7
3600353	99	36	31,4	cyclictest	3745506	-21	latency_hist	16:33:35	7
3600349	99	36	34,2	cyclictest	4078191	-21	kworker/u16:0+flush-8:0	19:44:03	6
3600353	99	35	33,1	cyclictest	0	-21	swapper/7	18:53:50	7
3600340	99	35	33,2	cyclictest	4165774	-21	kworker/u16:3+events_unbound	20:48:07	4
3600340	99	35	33,2	cyclictest	4038485	-21	kworker/u16:1+events_unbound	19:28:34	4
3600340	99	35	33,2	cyclictest	3847098	-21	kworker/u16:5+events_unbound	18:30:36	4
3600344	99	34	32,2	cyclictest	3847098	-21	kworker/u16:5+events_unbound	18:38:58	5
3600340	99	34	32,2	cyclictest	4165774	-21	kworker/u16:3+flush-8:0	20:10:07	4
3600340	99	34	32,2	cyclictest	3634314	-21	kworker/u16:2+events_unbound	16:20:07	4
3600340	99	34	32,2	cyclictest	3543788	-21	kworker/u16:0+events_unbound	15:54:11	4
3600340	99	34	31,2	cyclictest	4078191	-21	kworker/u16:0+flush-8:0	20:38:37	4
3600353	99	33	28,4	cyclictest	4069087	-21	latency_hist	19:13:35	7
3600353	99	33	0,31	cyclictest	4160236	-21	latency_hist	19:58:35	7
3600349	99	33	31,2	cyclictest	3847098	-21	kworker/u16:5+flush-8:0	17:28:30	6
3600349	99	33	31,2	cyclictest	3755338	-21	kworker/u16:2+flush-8:0	17:13:58	6
3600349	99	33	31,2	cyclictest	3755338	-21	kworker/u16:2+flush-8:0	17:13:58	6
3600349	99	32	30,2	cyclictest	3634314	-21	kworker/u16:2+flush-8:0	15:57:45	6
3600344	99	32	30,2	cyclictest	47532	-21	kworker/u16:4+flush-8:0	20:43:53	5
3600340	99	32	30,2	cyclictest	3543788	-21	kworker/u16:0+flush-8:0	15:34:10	4
3600353	99	31	30,0	cyclictest	0	-21	swapper/7	18:34:01	7
3600349	99	31	29,2	cyclictest	4038485	-21	kworker/u16:1+flush-8:0	19:07:37	6
3600340	99	31	29,2	cyclictest	4078191	-21	kworker/u16:0+flush-8:0	20:31:07	4
3600340	99	31	29,2	cyclictest	4038485	-21	kworker/u16:1+events_unbound	19:43:08	4
3600340	99	31	29,2	cyclictest	3878768	-21	kworker/u16:2+events_unbound	17:44:46	4
3600340	99	31	29,2	cyclictest	3876869	-21	kworker/u16:0+events_unbound	17:35:08	4
3600340	99	31	29,2	cyclictest	3785899	-21	kworker/u16:6+flush-8:0	16:55:43	4
3600340	99	31	29,2	cyclictest	3609312	-21	kworker/u16:2+events_unbound	15:24:11	4
3600340	99	31	29,2	cyclictest	3543788	-21	kworker/u16:0+flush-8:0	15:52:46	4
3600340	99	31	29,2	cyclictest	3543788	-21	kworker/u16:0+events_unbound	17:11:41	4
3600340	99	31	28,2	cyclictest	3684856	-21	kworker/u16:3+events_unbound	16:13:50	4
3600349	99	30	28,2	cyclictest	3816753	-21	kworker/u16:3+events_unbound	17:23:30	6
3600349	99	30	27,2	cyclictest	3609312	-21	kworker/u16:2+flush-8:0	15:28:51	6
3600344	99	30	28,2	cyclictest	3956731	-21	kworker/u16:2+flush-8:0	18:19:06	5
3600344	99	30	27,2	cyclictest	3634314	-21	kworker/u16:2+flush-8:0	16:22:46	5
3600340	99	30	28,2	cyclictest	3847098	-21	kworker/u16:5+events_unbound	18:40:26	4
3600340	99	30	28,2	cyclictest	3735791	-21	kworker/u16:1+flush-8:0	16:34:10	4
3600353	99	29	0,27	cyclictest	3806242	-21	latency_hist	17:03:35	7
3600349	99	29	27,2	cyclictest	3847098	-21	kworker/u16:5+flush-8:0	18:43:29	6
3600344	99	29	27,2	cyclictest	4099268	-21	kworker/u16:4+events_unbound	19:38:58	5
3600340	99	29	27,2	cyclictest	4190501	-21	kworker/u16:1+events_unbound	20:14:03	4
3600340	99	29	27,2	cyclictest	4190501	-21	kworker/u16:1+events_unbound	20:14:03	4
3600340	99	29	27,2	cyclictest	4165774	-21	kworker/u16:3+events_unbound	19:59:49	4
3600340	99	29	27,2	cyclictest	4038485	-21	kworker/u16:1+flush-8:0	19:58:25	4
3600340	99	29	27,2	cyclictest	4038485	-21	kworker/u16:1+events_unbound	18:58:09	4
3600340	99	29	27,2	cyclictest	3917470	-21	kworker/u16:1+events_unbound	18:10:46	4
3600340	99	29	27,2	cyclictest	3897058	-21	kworker/u16:0+events_unbound	18:26:06	4
3600340	99	29	27,2	cyclictest	3816753	-21	kworker/u16:3+events_unbound	17:29:10	4
3600340	99	29	27,2	cyclictest	3816753	-21	kworker/u16:3+events_unbound	17:26:47	4
3600340	99	29	27,2	cyclictest	3796526	-21	kworker/u16:1+events_unbound	17:07:09	4
3600340	99	29	27,2	cyclictest	3763086	-21	kworker/u16:4+events_unbound	16:45:18	4
3600340	99	29	26,2	cyclictest	4165774	-21	kworker/u16:3+flush-8:0	20:20:09	4
3600340	99	29	26,2	cyclictest	4058958	-21	kworker/u16:2+events_unbound	19:18:38	4
3600353	99	28	27,0	cyclictest	0	-21	swapper/7	17:13:50	7
3600353	99	28	27,0	cyclictest	0	-21	swapper/7	17:13:50	7
3600349	99	28	26,2	cyclictest	4190501	-21	kworker/u16:1+events_unbound	20:38:30	6
3600344	99	28	25,2	cyclictest	3897058	-21	kworker/u16:0+events_unbound	18:23:49	5
3600344	99	28	25,2	cyclictest	3634314	-21	kworker/u16:2+events_unbound	16:03:50	5
3600340	99	28	26,2	cyclictest	4099268	-21	kworker/u16:4+events_unbound	19:51:58	4
3600340	99	28	26,2	cyclictest	4038485	-21	kworker/u16:1+events_unbound	20:05:25	4
3600340	99	28	26,2	cyclictest	3816753	-21	kworker/u16:3+flush-8:0	17:23:33	4
3600340	99	28	26,2	cyclictest	3763086	-21	kworker/u16:4+flush-8:0	16:41:23	4
3600340	99	28	26,2	cyclictest	3568923	-21	kworker/u16:3+events_unbound	15:41:02	4
3600340	99	28	26,2	cyclictest	3543788	-21	kworker/u16:0+flush-8:0	15:44:10	4
3600340	99	28	26,2	cyclictest	3543788	-21	kworker/u16:0+flush-8:0	15:44:10	4
3600340	99	28	25,3	cyclictest	4099268	-21	kworker/u16:4+events_unbound	19:30:00	4
3600340	99	28	25,3	cyclictest	4099268	-21	kworker/u16:4+events_unbound	19:30:00	4
3600353	99	27	26,0	cyclictest	0	-21	swapper/7	17:53:53	7
3600353	99	27	25,1	cyclictest	0	-21	swapper/7	18:28:53	7
3600349	99	27	25,2	cyclictest	3543788	-21	kworker/u16:0+flush-8:0	16:07:45	6
3600349	99	27	25,2	cyclictest	3543788	-21	kworker/u16:0+events_unbound	16:13:07	6
3600344	99	27	24,2	cyclictest	3816753	-21	kworker/u16:3+flush-8:0	17:30:38	5
3600344	99	27	24,2	cyclictest	3755338	-21	kworker/u16:2+events_unbound	17:13:48	5
3600344	99	27	24,2	cyclictest	3755338	-21	kworker/u16:2+events_unbound	17:13:48	5
3600340	99	27	25,2	cyclictest	4165774	-21	kworker/u16:3+events_unbound	20:49:07	4
3600340	99	27	25,2	cyclictest	4058958	-21	kworker/u16:2+flush-8:0	19:09:18	4
3600340	99	27	25,2	cyclictest	37826	-21	kworker/u16:2+events_unbound	20:34:57	4
3600353	99	26	25,0	cyclictest	0	-21	swapper/7	19:48:59	7
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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