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 Sun Jul 12, 2026 12:43:33)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
3387631	2	54	19,30	sleep7	0	-21	swapper/7	07:09:12	7
3387964	99	42	37,4	cyclictest	3982443	-21	latency_hist	11:34:37	7
3387964	99	42	37,4	cyclictest	3586056	-21	latency_hist	08:49:38	7
3387952	99	42	40,2	cyclictest	3936840	-21	kworker/u16:0+events_unbound	11:15:11	5
3387534	2	42	31,8	sleep5	0	-21	swapper/5	07:07:49	5
3387544	2	40	29,8	sleep6	0	-21	swapper/6	07:07:58	6
3387952	99	39	37,2	cyclictest	3646248	-21	kworker/u16:0+events_unbound	10:39:56	5
3387952	99	39	35,4	cyclictest	3646248	-21	kworker/u16:0+flush-8:0	09:34:37	5
3387952	99	39	34,4	cyclictest	3646248	-21	kworker/u16:0+flush-8:0	10:04:37	5
3387952	99	38	35,2	cyclictest	3805538	-21	kworker/u16:2+events_unbound	10:21:57	5
3387598	2	38	27,8	sleep4	0	-21	swapper/4	07:08:44	4
3387952	99	37	35,2	cyclictest	4056681	-21	kworker/u16:1+events_unbound	12:26:48	5
3387952	99	37	35,2	cyclictest	3871718	-21	kworker/u16:1+flush-8:0	11:35:11	5
3387952	99	37	35,2	cyclictest	3646248	-21	kworker/u16:0+events_unbound	10:50:12	5
3387952	99	36	34,2	cyclictest	3533509	-21	kworker/u16:2+events_unbound	09:38:44	5
3387948	99	36	34,2	cyclictest	3615243	-21	kworker/u16:1+events_unbound	09:09:51	4
3387952	99	35	33,2	cyclictest	3936840	-21	kworker/u16:0+events_unbound	11:26:27	5
3387952	99	35	33,2	cyclictest	3763991	-21	kworker/u16:4+flush-8:0	10:15:43	5
3387952	99	35	33,2	cyclictest	3763991	-21	kworker/u16:4+events_unbound	10:45:48	5
3387948	99	35	32,3	cyclictest	3358762	-21	kworker/u16:2+flush-8:0	07:54:37	4
3387952	99	34	32,2	cyclictest	3936840	-21	kworker/u16:0+events_unbound	11:31:08	5
3387952	99	34	32,2	cyclictest	3763991	-21	kworker/u16:4+flush-8:0	11:39:56	5
3387952	99	34	32,2	cyclictest	3763991	-21	kworker/u16:4+events_unbound	11:00:39	5
3387952	99	34	32,2	cyclictest	3454589	-21	kworker/u16:0+flush-8:0	07:40:07	5
3387948	99	34	31,2	cyclictest	3507308	-21	kworker/u16:4+flush-8:0	08:24:37	4
3387952	99	33	31,2	cyclictest	4056681	-21	kworker/u16:1+flush-8:0	12:29:51	5
3387952	99	33	31,2	cyclictest	3871718	-21	kworker/u16:1+flush-8:0	11:05:40	5
3387952	99	33	31,2	cyclictest	3871718	-21	kworker/u16:1+flush-8:0	11:05:40	5
3387952	99	33	31,2	cyclictest	3763991	-21	kworker/u16:4+flush-8:0	11:20:10	5
3387952	99	33	31,2	cyclictest	3646248	-21	kworker/u16:0+events_unbound	10:57:35	5
3387952	99	33	30,2	cyclictest	3615243	-21	kworker/u16:1+events_unbound	09:19:51	5
3387964	99	32	27,4	cyclictest	3834718	-21	latency_hist	10:34:37	7
3387952	99	32	30,2	cyclictest	3720652	-21	kworker/u16:1+events_unbound	09:58:48	5
3387952	99	32	30,2	cyclictest	3646248	-21	kworker/u16:0+events_unbound	10:07:47	5
3387948	99	32	30,2	cyclictest	3533509	-21	kworker/u16:2+events_unbound	09:29:02	4
3635854	2	31	0,1	chrt	3635855	-21	sh	09:12:02	7
3387952	99	31	29,2	cyclictest	4056681	-21	kworker/u16:1+events_unbound	12:12:11	5
3387952	99	31	29,2	cyclictest	4031676	-21	kworker/u16:0+events_unbound	12:01:51	5
3387952	99	31	29,2	cyclictest	3995178	-21	kworker/u16:2+events_unbound	12:22:48	5
3387952	99	31	29,2	cyclictest	3871718	-21	kworker/u16:1+events_unbound	11:49:15	5
3387952	99	31	29,2	cyclictest	3871718	-21	kworker/u16:1+events_unbound	11:49:15	5
3387952	99	31	29,2	cyclictest	3763991	-21	kworker/u16:4+events_unbound	11:50:47	5
3387952	99	31	29,2	cyclictest	3586264	-21	kworker/u16:0+events_unbound	08:49:59	5
3387952	99	31	29,2	cyclictest	3533509	-21	kworker/u16:2+flush-8:0	08:40:07	5
3387952	99	31	29,2	cyclictest	3533509	-21	kworker/u16:2+events_unbound	09:40:08	5
3387952	99	31	29,2	cyclictest	3507308	-21	kworker/u16:4+flush-8:0	09:09:59	5
3387952	99	31	28,2	cyclictest	3763991	-21	kworker/u16:4+flush-8:0	11:59:36	5
3896877	2	30	0,1	chrt	3896876	-21	cpuspeed	10:59:49	7
3557542	2	30	0,1	chrt	0	-21	swapper/4	08:34:49	4
3387952	99	30	28,2	cyclictest	4031676	-21	kworker/u16:0+events_unbound	12:19:11	5
3387952	99	30	28,2	cyclictest	3763991	-21	kworker/u16:4+events_unbound	10:10:47	5
3387952	99	30	28,2	cyclictest	3720652	-21	kworker/u16:1+events_unbound	09:47:49	5
3387952	99	30	28,2	cyclictest	3533509	-21	kworker/u16:2+flush-8:0	09:28:56	5
3387952	99	30	27,2	cyclictest	3918486	-21	kworker/u16:2+events_unbound	11:09:40	5
3387952	99	30	27,2	cyclictest	3763991	-21	kworker/u16:4+events_unbound	10:30:16	5
3697817	2	29	0,1	chrt	3697818	-21	sh	09:37:18	7
3387952	99	29	27,2	cyclictest	3785419	-21	kworker/u16:1+events_unbound	10:26:17	5
3387952	99	29	27,2	cyclictest	3785419	-21	kworker/u16:1+events_unbound	10:26:17	5
3387952	99	29	27,2	cyclictest	3763991	-21	kworker/u16:4+events_unbound	10:36:27	5
3387952	99	29	27,2	cyclictest	3590714	-21	kworker/u16:3+flush-8:0	08:59:55	5
3387948	99	29	27,2	cyclictest	3720652	-21	kworker/u16:1+flush-8:0	10:00:08	4
3387952	99	28	26,2	cyclictest	4056681	-21	kworker/u16:1+events_unbound	12:37:19	5
3387952	99	28	26,2	cyclictest	3646248	-21	kworker/u16:0+flush-8:0	09:50:36	5
3387964	99	27	21,5	cyclictest	3518000	-21	latency_hist	08:14:37	7
3387952	99	27	25,2	cyclictest	3763991	-21	kworker/u16:4+events_unbound	12:07:00	5
3883924	2	26	0,1	chrt	3883926	-21	ssh	10:54:36	7
3387964	99	26	20,5	cyclictest	4093052	-21	latency_hist	12:19:37	7
3387952	99	26	24,2	cyclictest	3615243	-21	kworker/u16:1+flush-8:0	09:15:47	5
3387952	99	26	24,2	cyclictest	3615243	-21	kworker/u16:1+events_unbound	09:07:12	5
3387952	99	26	24,2	cyclictest	3332511	-21	kworker/u16:4+flush-8:0	07:44:50	5
3387948	99	26	23,2	cyclictest	3533509	-21	kworker/u16:2+events_unbound	08:54:52	4
4012190	2	25	0,1	chrt	0	-21	swapper/4	11:44:58	4
4012190	2	25	0,1	chrt	0	-21	swapper/4	11:44:58	4
3387964	99	25	24,0	cyclictest	0	-21	swapper/7	08:50:16	7
3387964	99	25	24,0	cyclictest	0	-21	swapper/7	08:04:01	7
3387952	99	25	22,2	cyclictest	3586264	-21	kworker/u16:0+flush-8:0	08:54:58	5
3387964	99	24	23,0	cyclictest	0	-21	swapper/7	09:07:24	7
3387964	99	24	23,0	cyclictest	0	-21	swapper/7	07:49:52	7
3387964	99	24	21,2	cyclictest	3673949	-21	ssh	09:28:52	7
3387964	99	24	17,5	cyclictest	648	-21	systemd-journal	08:44:37	7
3387952	99	24	22,2	cyclictest	3332511	-21	kworker/u16:4+flush-8:0	07:29:56	5
3387948	99	24	22,2	cyclictest	4093090	-21	kworker/u16:3+flush-8:0	12:34:36	4
3387952	99	23	21,2	cyclictest	3478140	-21	kworker/u16:3+flush-8:0	08:04:58	5
3387964	99	22	21,0	cyclictest	0	-21	swapper/7	10:27:28	7
3387964	99	22	21,0	cyclictest	0	-21	swapper/7	10:27:28	7
3387964	99	22	21,0	cyclictest	0	-21	swapper/7	08:27:07	7
3387964	99	22	21,0	cyclictest	0	-21	swapper/7	08:08:56	7
3387952	99	22	20,2	cyclictest	3441425	-21	kworker/u16:1+flush-8:0	08:25:47	5
3387952	99	22	20,2	cyclictest	3358762	-21	kworker/u16:2+flush-8:0	07:24:32	5
3387952	99	22	20,2	cyclictest	3332511	-21	kworker/u16:4+flush-8:0	07:15:08	5
3387948	99	22	20,2	cyclictest	3995178	-21	kworker/u16:2+flush-8:0	12:05:19	4
3387948	99	22	19,2	cyclictest	3507308	-21	kworker/u16:4+flush-8:0	08:29:52	4
3387964	99	21	20,0	cyclictest	0	-21	swapper/7	08:21:31	7
3387948	99	21	19,2	cyclictest	3763991	-21	kworker/u16:4+flush-8:0	10:44:52	4
3387948	99	21	19,2	cyclictest	3358762	-21	kworker/u16:2+flush-8:0	07:20:05	4
3387948	99	21	18,2	cyclictest	3646248	-21	kworker/u16:0+flush-8:0	09:54:32	4
3387948	99	21	17,3	cyclictest	3763991	-21	kworker/u16:4+flush-8:0	10:49:55	4
4141120	2	20	0,1	chrt	4141119	-21	ssh	12:37:35	7
3387964	99	20	19,0	cyclictest	0	-21	swapper/7	08:30:53	7
3387964	99	20	19,0	cyclictest	0	-21	swapper/7	07:47:15	7
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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