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 Jun 21, 2026 00:43:29)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
255701	2	69	0,1	sleep4	0	-21	swapper/4	22:03:25	4
4077686	2	47	36,8	sleep5	0	-21	swapper/5	19:07:23	5
4077688	2	46	11,30	sleep7	0	-21	swapper/7	19:07:25	7
4077843	2	43	32,8	sleep4	0	-21	swapper/4	19:09:38	4
4078128	99	37	35,2	cyclictest	561881	-21	kworker/u16:0+events_unbound	00:39:14	6
4078128	99	36	34,2	cyclictest	244278	-21	kworker/u16:1+events_unbound	22:41:23	6
4078128	99	36	30,6	cyclictest	4014666	-21	kworker/u16:1+events_unbound	21:32:46	6
4078128	99	35	33,2	cyclictest	93004	-21	kworker/u16:3+flush-8:0	21:17:23	6
4078128	99	35	33,2	cyclictest	63916	-21	kworker/u16:0+flush-8:0	21:13:48	6
4078128	99	35	33,2	cyclictest	256501	-21	kworker/u16:5+events_unbound	23:08:23	6
4077732	2	35	25,7	sleep6	0	-21	swapper/6	19:08:04	6
4078128	99	34	32,2	cyclictest	486428	-21	kworker/u16:3+events_unbound	23:44:27	6
4078128	99	34	32,2	cyclictest	4169978	-21	kworker/u16:4+events_unbound	21:47:27	6
4078128	99	34	32,2	cyclictest	244278	-21	kworker/u16:1+events_unbound	22:27:35	6
4078122	99	34	32,2	cyclictest	502208	-21	kworker/u16:2+flush-8:0	23:45:10	4
4078128	99	33	31,2	cyclictest	426697	-21	kworker/u16:2+events_unbound	23:31:39	6
4078128	99	33	31,2	cyclictest	388537	-21	kworker/u16:1+events_unbound	23:19:18	6
4078128	99	33	31,2	cyclictest	339608	-21	kworker/u16:3+flush-8:0	22:35:22	6
4078122	99	33	31,2	cyclictest	561881	-21	kworker/u16:0+flush-8:0	00:35:14	4
4078122	99	33	31,2	cyclictest	388537	-21	kworker/u16:1+flush-8:0	23:00:11	4
4078122	99	33	30,2	cyclictest	4058351	-21	kworker/u16:2+flush-8:0	19:55:11	4
4078128	99	32	30,2	cyclictest	93004	-21	kworker/u16:3+events_unbound	21:58:59	6
4078128	99	32	30,2	cyclictest	93004	-21	kworker/u16:3+events_unbound	21:53:11	6
4078128	99	32	30,2	cyclictest	486428	-21	kworker/u16:3+events_unbound	23:36:10	6
4078128	99	32	30,2	cyclictest	476401	-21	kworker/u16:0+events_unbound	23:48:39	6
4078128	99	32	30,2	cyclictest	4169978	-21	kworker/u16:4+events_unbound	21:23:03	6
4078122	99	32	29,2	cyclictest	256501	-21	kworker/u16:5+flush-8:0	23:14:58	4
4078128	99	31	29,2	cyclictest	426697	-21	kworker/u16:2+events_unbound	23:14:19	6
4078128	99	31	29,2	cyclictest	244278	-21	kworker/u16:1+events_unbound	22:32:10	6
4078128	99	31	29,2	cyclictest	244278	-21	kworker/u16:1+events_unbound	22:14:06	6
4078128	99	31	29,2	cyclictest	244278	-21	kworker/u16:1+events_unbound	22:14:06	6
4078122	99	31	29,2	cyclictest	4169978	-21	kworker/u16:4+events_unbound	22:19:59	4
4078122	99	31	29,2	cyclictest	4058351	-21	kworker/u16:2+events_unbound	19:20:10	4
4078130	99	30	28,1	cyclictest	167	50	irq/16-ehci_hcd:usb4	21:54:45	7
4078128	99	30	28,2	cyclictest	93004	-21	kworker/u16:3+events_unbound	21:26:07	6
4078128	99	30	28,2	cyclictest	584176	-21	kworker/u16:1+events_unbound	00:24:29	6
4078128	99	30	28,2	cyclictest	584176	-21	kworker/u16:1+events_unbound	00:24:29	6
4078128	99	30	28,2	cyclictest	561881	-21	kworker/u16:0+events_unbound	00:28:35	6
4078128	99	30	28,2	cyclictest	561881	-21	kworker/u16:0+events_unbound	00:28:35	6
4078128	99	30	28,2	cyclictest	537897	-21	kworker/u16:4+events_unbound	00:13:22	6
4078128	99	30	28,2	cyclictest	486428	-21	kworker/u16:3+events_unbound	00:02:18	6
4078128	99	30	28,2	cyclictest	4169978	-21	kworker/u16:4+flush-8:0	20:35:09	6
4078128	99	30	28,2	cyclictest	4169978	-21	kworker/u16:4+events_unbound	22:16:59	6
4078128	99	30	28,2	cyclictest	4169978	-21	kworker/u16:4+events_unbound	21:36:34	6
4078128	99	30	28,2	cyclictest	388537	-21	kworker/u16:1+events_unbound	00:07:46	6
4078128	99	30	28,2	cyclictest	256501	-21	kworker/u16:5+events_unbound	22:56:46	6
4078122	99	30	28,2	cyclictest	4058351	-21	kworker/u16:2+events_unbound	20:04:59	4
4078122	99	30	28,2	cyclictest	4058351	-21	kworker/u16:2+events_unbound	20:04:59	4
4078122	99	30	27,3	cyclictest	4014666	-21	kworker/u16:1+flush-8:0	21:05:11	4
4078128	99	29	27,2	cyclictest	561881	-21	kworker/u16:0+events_unbound	00:30:46	6
4078122	99	29	27,2	cyclictest	388537	-21	kworker/u16:1+flush-8:0	23:58:39	4
4078122	99	29	27,2	cyclictest	256501	-21	kworker/u16:5+flush-8:0	22:49:50	4
4078122	99	29	27,2	cyclictest	183604	-21	kworker/u16:2+events_unbound	21:35:14	4
4078122	99	29	26,2	cyclictest	63916	-21	kworker/u16:0+flush-8:0	21:10:02	4
4078128	99	28	26,2	cyclictest	93004	-21	kworker/u16:3+events_unbound	22:02:59	6
4078128	99	28	26,2	cyclictest	388537	-21	kworker/u16:1+flush-8:0	23:57:07	6
4078128	99	28	26,2	cyclictest	388537	-21	kworker/u16:1+events_unbound	23:53:14	6
4078128	99	28	21,6	cyclictest	244278	-21	kworker/u16:1+events_unbound	22:44:50	6
4078122	99	28	26,2	cyclictest	4169978	-21	kworker/u16:4+flush-8:0	21:19:40	4
4078122	99	28	25,2	cyclictest	586641	-21	kworker/u16:2+events_unbound	00:29:47	4
4078130	99	27	26,0	cyclictest	0	-21	swapper/7	21:55:00	7
4078130	99	27	22,4	cyclictest	650	-21	systemd-journal	22:49:45	7
4078128	99	27	25,2	cyclictest	4169978	-21	kworker/u16:4+flush-8:0	22:08:50	6
4078122	99	27	25,2	cyclictest	561881	-21	kworker/u16:0+flush-8:0	00:10:26	4
4078122	99	27	25,2	cyclictest	4014666	-21	kworker/u16:1+events_unbound	19:30:10	4
4078122	99	27	24,2	cyclictest	183604	-21	kworker/u16:2+events_unbound	22:09:59	4
4078122	99	27	24,2	cyclictest	183604	-21	kworker/u16:2+events_unbound	22:09:59	4
4078130	99	26	25,0	cyclictest	0	-21	swapper/7	19:45:11	7
4078128	99	26	24,2	cyclictest	426697	-21	kworker/u16:2+events_unbound	23:26:10	6
4078128	99	26	24,2	cyclictest	4014666	-21	kworker/u16:1+events_unbound	21:44:15	6
4078128	99	26	24,2	cyclictest	339608	-21	kworker/u16:3+flush-8:0	22:51:50	6
4078122	99	26	24,2	cyclictest	4014666	-21	kworker/u16:1+events_unbound	21:39:59	4
4078122	99	26	24,2	cyclictest	256501	-21	kworker/u16:5+flush-8:0	22:45:26	4
4078122	99	26	24,2	cyclictest	256501	-21	kworker/u16:5+events_unbound	22:36:42	4
4078122	99	26	23,2	cyclictest	318071	-21	kworker/u16:0+flush-8:0	22:30:15	4
4078122	99	26	23,2	cyclictest	256501	-21	kworker/u16:5+flush-8:0	23:09:40	4
353508	2	26	0,1	chrt	353506	-21	ssh	22:43:19	7
4078128	99	25	23,2	cyclictest	486428	-21	kworker/u16:3+events_unbound	00:14:46	6
4078128	99	25	23,2	cyclictest	256501	-21	kworker/u16:5+events_unbound	22:22:57	6
4078124	99	25	21,3	cyclictest	219874	-21	awk	21:49:45	5
4078122	99	25	23,2	cyclictest	476401	-21	kworker/u16:0+flush-8:0	23:38:51	4
4078122	99	25	23,2	cyclictest	244278	-21	kworker/u16:1+flush-8:0	22:15:43	4
4078122	99	25	23,2	cyclictest	242023	-21	kworker/u16:0+flush-8:0	21:59:42	4
4078122	99	25	22,2	cyclictest	63916	-21	kworker/u16:0+events_unbound	20:49:58	4
4078122	99	24	23,1	cyclictest	4169978	-21	kworker/u16:4+events_unbound	22:07:56	4
4078122	99	24	22,2	cyclictest	561881	-21	kworker/u16:0+flush-8:0	00:15:30	4
4078122	99	24	22,2	cyclictest	4169978	-21	kworker/u16:4+events_unbound	21:50:03	4
4078122	99	24	21,2	cyclictest	93004	-21	kworker/u16:3+flush-8:0	21:24:51	4
4078122	99	23	21,2	cyclictest	537897	-21	kworker/u16:4+events_unbound	00:04:40	4
4078122	99	23	21,2	cyclictest	486428	-21	kworker/u16:3+flush-8:0	23:50:58	4
4078122	99	23	21,2	cyclictest	256501	-21	kworker/u16:5+flush-8:0	23:28:06	4
4078122	99	23	21,2	cyclictest	256501	-21	kworker/u16:5+flush-8:0	23:14:27	4
4078128	99	22	20,2	cyclictest	4058351	-21	kworker/u16:2+flush-8:0	20:00:03	6
4078128	99	22	20,2	cyclictest	4058351	-21	kworker/u16:2+flush-8:0	20:00:03	6
4078128	99	22	20,2	cyclictest	388537	-21	kworker/u16:1+events_unbound	23:00:34	6
4078122	99	22	20,2	cyclictest	4137364	-21	kworker/u16:0+flush-8:0	19:35:14	4
4078130	99	21	20,0	cyclictest	0	-21	swapper/7	20:10:00	7
4078130	99	21	16,4	cyclictest	650	-21	systemd-journal	23:19:40	7
4078128	99	21	19,2	cyclictest	426697	-21	kworker/u16:2+events_unbound	23:21:50	6
4078128	99	21	18,2	cyclictest	4088091	-21	kworker/u16:4+flush-8:0	19:15:02	6
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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