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 04, 2026 12:43:32)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
3985350	2	62	51,8	sleep4	0	-21	swapper/4	07:07:24	4
3985778	99	55	50,4	cyclictest	66450	-21	latency_hist	09:24:24	7
3985419	2	51	16,30	sleep7	0	-21	swapper/7	07:08:24	7
3985778	99	46	40,4	cyclictest	411982	-21	latency_hist	11:44:24	7
3985773	99	46	43,2	cyclictest	101446	-21	kworker/u16:1+flush-8:0	09:44:24	5
3985369	2	43	33,7	sleep5	0	-21	swapper/5	07:07:42	5
3985773	99	41	38,3	cyclictest	101446	-21	kworker/u16:1+flush-8:0	09:59:25	5
3985773	99	41	38,2	cyclictest	177613	-21	kworker/u16:4+flush-8:0	10:09:43	5
3985773	99	38	32,5	cyclictest	348704	-21	kworker/u16:1+flush-8:0	11:39:24	5
3985768	99	38	35,2	cyclictest	460083	-21	kworker/u16:1+events_unbound	12:11:47	4
3985778	99	37	35,1	cyclictest	29450	-21	diskmemload	11:09:44	7
3985768	99	37	35,2	cyclictest	460084	-21	kworker/u16:4+events_unbound	12:04:31	4
3985778	99	36	32,3	cyclictest	187078	-21	ssh	10:10:01	7
3985768	99	36	34,2	cyclictest	473577	-21	kworker/u16:2+events_unbound	12:31:43	4
3985768	99	36	34,2	cyclictest	4135625	-21	kworker/u16:3+events_unbound	09:18:20	4
3985768	99	36	34,2	cyclictest	276317	-21	kworker/u16:1+events_unbound	10:56:52	4
3985778	99	35	34,0	cyclictest	0	-21	swapper/7	10:35:16	7
3985768	99	35	33,2	cyclictest	4193467	-21	kworker/u16:0+events_unbound	09:49:28	4
3985768	99	35	33,2	cyclictest	224707	-21	kworker/u16:0+events_unbound	11:06:15	4
3985768	99	35	33,2	cyclictest	150334	-21	kworker/u16:3+events_unbound	09:59:15	4
3985768	99	35	32,2	cyclictest	4135625	-21	kworker/u16:3+events_unbound	09:24:29	4
3985455	2	35	25,7	sleep6	0	-21	swapper/6	07:08:55	6
3985778	99	34	29,3	cyclictest	1065	-21	runrttasks	10:44:35	7
3985768	99	34	32,2	cyclictest	348704	-21	kworker/u16:1+events_unbound	11:39:08	4
3985768	99	34	32,2	cyclictest	336097	-21	kworker/u16:2+events_unbound	11:32:47	4
3985768	99	34	32,2	cyclictest	290099	-21	kworker/u16:3+events_unbound	11:54:31	4
3985768	99	34	32,2	cyclictest	290099	-21	kworker/u16:3+events_unbound	11:02:40	4
3985768	99	33	31,2	cyclictest	4193467	-21	kworker/u16:0+events_unbound	09:12:20	4
3985768	99	33	31,2	cyclictest	4193467	-21	kworker/u16:0+events_unbound	09:01:00	4
3985768	99	33	31,2	cyclictest	336097	-21	kworker/u16:2+events_unbound	11:21:10	4
469464	2	32	0,1	chrt	74	1	rcuc/5	12:04:47	5
3985778	99	32	27,4	cyclictest	78850	-21	latency_hist	09:29:24	7
3985773	99	32	30,2	cyclictest	4115896	-21	kworker/u16:0+flush-8:0	08:14:40	5
3985768	99	32	30,2	cyclictest	79276	-21	kworker/u16:2+flush-8:0	10:29:47	4
3985768	99	32	30,2	cyclictest	4193467	-21	kworker/u16:0+flush-8:0	09:22:01	4
3985768	99	32	30,2	cyclictest	290099	-21	kworker/u16:3+events_unbound	11:12:45	4
3985768	99	32	29,2	cyclictest	4193467	-21	kworker/u16:0+flush-8:0	09:34:51	4
3985768	99	31	29,2	cyclictest	473577	-21	kworker/u16:2+events_unbound	12:15:12	4
3985768	99	31	29,2	cyclictest	4193467	-21	kworker/u16:0+events_unbound	09:04:51	4
3985768	99	31	29,2	cyclictest	336097	-21	kworker/u16:2+events_unbound	11:29:16	4
3985768	99	31	29,2	cyclictest	177613	-21	kworker/u16:4+events_unbound	10:23:44	4
3985768	99	31	29,2	cyclictest	150334	-21	kworker/u16:3+events_unbound	10:34:58	4
3985778	99	30	29,0	cyclictest	0	-21	swapper/7	09:35:16	7
3985768	99	30	28,2	cyclictest	79276	-21	kworker/u16:2+events_unbound	10:05:14	4
3985768	99	30	28,2	cyclictest	4155015	-21	kworker/u16:1+events_unbound	08:43:00	4
3985768	99	30	28,2	cyclictest	4155015	-21	kworker/u16:1+events_unbound	08:36:01	4
3985768	99	30	28,2	cyclictest	410634	-21	kworker/u16:0+events_unbound	11:51:45	4
3985768	99	30	28,2	cyclictest	3966099	-21	kworker/u16:2+events_unbound	08:33:00	4
3985768	99	30	28,2	cyclictest	177613	-21	kworker/u16:4+events_unbound	10:14:31	4
3985768	99	30	27,2	cyclictest	4193467	-21	kworker/u16:0+events_unbound	08:54:26	4
488608	2	29	0,1	chrt	0	-21	swapper/6	12:14:42	6
3985773	99	29	27,2	cyclictest	4028458	-21	kworker/u16:4+events_unbound	07:29:48	5
3985768	99	29	28,1	cyclictest	79276	-21	kworker/u16:2+events_unbound	10:28:35	4
3985768	99	29	27,2	cyclictest	64040	-21	kworker/u16:5+events_unbound	10:00:37	4
3985768	99	29	27,2	cyclictest	4115896	-21	kworker/u16:0+events_unbound	08:19:50	4
3985768	99	29	27,2	cyclictest	4076623	-21	kworker/u16:1+events_unbound	08:01:40	4
3985768	99	29	27,2	cyclictest	336097	-21	kworker/u16:2+events_unbound	11:41:21	4
3985768	99	29	27,2	cyclictest	290099	-21	kworker/u16:3+events_unbound	11:45:45	4
3985768	99	29	27,2	cyclictest	276317	-21	kworker/u16:1+events_unbound	10:51:18	4
3985773	99	28	26,2	cyclictest	79276	-21	kworker/u16:2+flush-8:0	09:54:20	5
3985773	99	28	26,2	cyclictest	423281	-21	kworker/u16:2+flush-8:0	12:02:16	5
3985773	99	28	26,2	cyclictest	224707	-21	kworker/u16:0+events_unbound	10:55:16	5
3985768	99	28	26,2	cyclictest	4115896	-21	kworker/u16:0+events_unbound	08:14:37	4
3985775	99	27	24,2	cyclictest	224707	-21	kworker/u16:0+events_unbound	11:04:27	6
3985773	99	27	25,2	cyclictest	498331	-21	kworker/u16:0+flush-8:0	12:39:24	5
3985773	99	27	25,2	cyclictest	177613	-21	kworker/u16:4+flush-8:0	10:19:39	5
3985768	99	27	25,2	cyclictest	79276	-21	kworker/u16:2+events_unbound	09:33:46	4
3985768	99	27	25,2	cyclictest	64040	-21	kworker/u16:5+events_unbound	09:45:30	4
3985768	99	27	25,2	cyclictest	498331	-21	kworker/u16:0+events_unbound	12:36:36	4
3985768	99	27	25,2	cyclictest	4135625	-21	kworker/u16:3+flush-8:0	08:44:44	4
3985768	99	27	25,2	cyclictest	410634	-21	kworker/u16:0+flush-8:0	12:03:58	4
3985768	99	27	25,2	cyclictest	224707	-21	kworker/u16:0+events_unbound	10:48:37	4
3985768	99	27	25,2	cyclictest	150334	-21	kworker/u16:3+events_unbound	10:41:45	4
3985768	99	26	24,2	cyclictest	460084	-21	kworker/u16:4+events_unbound	12:25:33	4
3985768	99	26	24,2	cyclictest	3021330	-21	kworker/u16:0+events_unbound	07:47:04	4
3985768	99	26	24,2	cyclictest	290099	-21	kworker/u16:3+flush-8:0	11:15:26	4
3985768	99	26	24,2	cyclictest	2530310	-21	kworker/u16:1+flush-8:0	07:33:08	4
3985778	99	25	23,1	cyclictest	0	-21	swapper/7	10:34:04	7
3985773	99	25	23,2	cyclictest	3945853	-21	kworker/u16:3+flush-8:0	07:24:48	5
3985768	99	25	23,2	cyclictest	460084	-21	kworker/u16:4+flush-8:0	12:20:41	4
3985768	99	25	23,2	cyclictest	4028458	-21	kworker/u16:4+events_unbound	07:38:48	4
3985768	99	25	23,2	cyclictest	3945853	-21	kworker/u16:3+flush-8:0	07:26:59	4
3985768	99	25	23,2	cyclictest	150334	-21	kworker/u16:3+events_unbound	10:10:03	4
3985768	99	25	22,2	cyclictest	3966099	-21	kworker/u16:2+events_unbound	08:24:28	4
3985778	99	24	22,1	cyclictest	29450	-21	diskmemload	09:09:40	7
3985775	99	24	22,2	cyclictest	101446	-21	kworker/u16:1+flush-8:0	10:15:15	6
3985768	99	24	22,2	cyclictest	4193467	-21	kworker/u16:0+flush-8:0	09:39:47	4
3985768	99	24	22,2	cyclictest	4086871	-21	kworker/u16:3+flush-8:0	08:13:04	4
3985768	99	24	22,2	cyclictest	4028458	-21	kworker/u16:4+events_unbound	07:44:00	4
3985775	99	23	21,2	cyclictest	460083	-21	kworker/u16:1+flush-8:0	12:04:25	6
3985775	99	23	21,2	cyclictest	4193467	-21	kworker/u16:0+flush-8:0	09:04:19	6
3985775	99	23	21,2	cyclictest	4028458	-21	kworker/u16:4+flush-8:0	07:44:52	6
3985775	99	23	21,2	cyclictest	4028458	-21	kworker/u16:4+events_unbound	07:39:40	6
3985768	99	23	21,2	cyclictest	4076623	-21	kworker/u16:1+events_unbound	07:58:36	4
3985768	99	23	21,2	cyclictest	3966099	-21	kworker/u16:2+flush-8:0	07:52:04	4
3985768	99	23	21,2	cyclictest	3966099	-21	kworker/u16:2+events_unbound	07:21:24	4
3985778	99	22	0,20	cyclictest	445753	-21	grep	11:54:52	7
3985775	99	22	20,2	cyclictest	64040	-21	kworker/u16:5+flush-8:0	09:20:39	6
3985775	99	22	20,2	cyclictest	460083	-21	kworker/u16:1+flush-8:0	12:04:20	6
3985775	99	22	20,2	cyclictest	410634	-21	kworker/u16:0+flush-8:0	11:59:19	6
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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