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 50 highest latencies:

System rack0slot2.osadl.org (updated Sat Mar 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
2518790	2	57	47,7	sleep6	0	-21	swapper/6	19:01:20	6
2518907	2	48	37,8	sleep4	0	-21	swapper/4	19:03:02	4
2519273	99	47	43,3	cyclictest	650	-21	systemd-journal	23:53:52	7
2519273	99	47	40,5	cyclictest	3181192	-21	latency_hist	00:03:52	7
2518760	2	47	37,7	sleep5	0	-21	swapper/5	19:00:55	5
2519273	99	41	0,39	cyclictest	2990489	-21	latency_hist	22:43:52	7
2519268	99	41	33,6	cyclictest	2847308	-21	kworker/u16:1+flush-8:0	21:43:52	5
2510033	2	39	4,29	sleep7	0	-21	swapper/7	18:59:04	7
2519263	99	35	33,2	cyclictest	2696156	-21	kworker/u16:1+events_unbound	21:19:17	4
2519273	99	34	28,5	cyclictest	650	-21	systemd-journal	23:28:51	7
2519268	99	34	32,2	cyclictest	3071645	-21	kworker/u16:3+flush-8:0	23:29:17	5
2519268	99	34	31,2	cyclictest	2752758	-21	kworker/u16:3+events_unbound	21:29:07	5
2519268	99	34	31,2	cyclictest	2752758	-21	kworker/u16:3+events_unbound	21:29:07	5
2519263	99	34	32,2	cyclictest	2752758	-21	kworker/u16:3+events_unbound	21:24:18	4
2519263	99	33	31,2	cyclictest	2714197	-21	kworker/u16:2+flush-8:0	22:39:13	4
2519272	99	30	27,2	cyclictest	2490512	-21	kworker/u16:1+flush-8:0	19:19:10	6
2519272	99	30	27,2	cyclictest	2490512	-21	kworker/u16:1+flush-8:0	19:19:10	6
2519268	99	30	28,2	cyclictest	2999576	-21	kworker/u16:1+flush-8:0	23:08:52	5
2519273	99	29	28,0	cyclictest	0	-21	swapper/7	23:29:49	7
2519268	99	29	27,2	cyclictest	2990193	-21	kworker/u16:0+events_unbound	00:24:05	5
2519273	99	28	22,5	cyclictest	650	-21	systemd-journal	20:33:53	7
2519268	99	28	24,3	cyclictest	2847308	-21	kworker/u16:1+flush-8:0	22:19:09	5
3061107	2	27	0,1	chrt	3061105	-21	ssh	23:12:18	7
2519263	99	27	25,2	cyclictest	3071645	-21	kworker/u16:3+events_unbound	23:24:15	4
2519263	99	27	25,2	cyclictest	2776253	-21	kworker/u16:0+events_unbound	21:29:09	4
2519263	99	27	25,2	cyclictest	2776253	-21	kworker/u16:0+events_unbound	21:29:09	4
2519273	99	25	22,2	cyclictest	2811881	-21	munin-run	21:28:52	7
2519268	99	25	23,2	cyclictest	2570389	-21	kworker/u16:3+flush-8:0	19:49:18	5
2519263	99	25	22,2	cyclictest	2714197	-21	kworker/u16:2+events_unbound	21:59:15	4
2519268	99	24	20,3	cyclictest	2696156	-21	kworker/u16:1+flush-8:0	20:44:09	5
2519263	99	24	21,2	cyclictest	2647545	-21	kworker/u16:4+events_unbound	20:19:07	4
2519273	99	23	22,0	cyclictest	0	-21	swapper/7	21:53:58	7
2519272	99	23	21,2	cyclictest	2776253	-21	kworker/u16:0+events_unbound	21:39:19	6
2519263	99	23	22,1	cyclictest	2966996	-21	kworker/u16:5+events_unbound	22:34:12	4
2519273	99	22	21,0	cyclictest	0	-21	swapper/7	23:54:34	7
2519273	99	22	20,1	cyclictest	0	-21	swapper/7	22:54:04	7
2519273	99	22	20,1	cyclictest	0	-21	swapper/7	00:04:08	7
2519263	99	22	20,2	cyclictest	2990193	-21	kworker/u16:0+flush-8:0	23:48:52	4
2519263	99	22	20,2	cyclictest	2990193	-21	kworker/u16:0+events_unbound	23:14:13	4
2519263	99	22	19,2	cyclictest	2990193	-21	kworker/u16:0+events_unbound	23:29:05	4
2519273	99	21	20,0	cyclictest	0	-21	swapper/7	21:02:11	7
2519272	99	21	19,2	cyclictest	2714197	-21	kworker/u16:2+flush-8:0	21:44:18	6
2519268	99	21	19,2	cyclictest	2776253	-21	kworker/u16:0+events_unbound	22:14:06	5
2519268	99	21	19,2	cyclictest	2776253	-21	kworker/u16:0+events_unbound	22:14:06	5
2519263	99	21	19,2	cyclictest	2666313	-21	kworker/u16:2+events_unbound	20:24:08	4
2519273	99	20	19,0	cyclictest	0	-21	swapper/7	21:39:40	7
2519273	99	20	19,0	cyclictest	0	-21	swapper/7	19:47:12	7
2519273	99	20	19,0	cyclictest	0	-21	swapper/7	19:42:48	7
2519273	99	20	18,1	cyclictest	2915997	-21	ssh	22:09:17	7
2519273	99	20	18,1	cyclictest	2915997	-21	ssh	22:09:17	7
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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