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 Mon Aug 17, 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
2435553	2	101	0,0	sleep5	0	-21	swapper/5	10:28:09	5
1998339	99	57	54,2	cyclictest	2021221	-21	kworker/u16:2+events_unbound	07:28:01	6
1997758	2	55	20,30	sleep7	0	-21	swapper/7	07:03:54	7
1998337	99	49	46,2	cyclictest	2118967	-21	kworker/u16:1+flush-8:0	08:13:02	5
1997774	2	47	36,7	sleep5	0	-21	swapper/5	07:04:08	5
1998339	99	46	44,2	cyclictest	2307990	-21	kworker/u16:0+events_unbound	09:38:22	6
1998339	99	46	43,2	cyclictest	2515627	-21	kworker/u16:1+flush-8:0	11:13:00	6
1998339	99	44	42,2	cyclictest	2658871	-21	kworker/u16:0+flush-8:0	12:23:21	6
1998337	99	44	42,2	cyclictest	2455426	-21	kworker/u16:3+events_unbound	10:38:16	5
1998337	99	43	41,2	cyclictest	2236857	-21	kworker/u16:2+events_unbound	10:03:19	5
1998337	99	43	41,2	cyclictest	2205026	-21	kworker/u16:3+events_unbound	08:48:13	5
1998344	99	41	35,5	cyclictest	648	-21	systemd-journal	10:52:46	7
1998339	99	41	39,2	cyclictest	2307990	-21	kworker/u16:0+events_unbound	09:43:17	6
1998339	99	41	39,2	cyclictest	2236857	-21	kworker/u16:2+events_unbound	10:23:17	6
1998339	99	41	38,2	cyclictest	2118967	-21	kworker/u16:1+flush-8:0	08:08:00	6
1998337	99	41	39,2	cyclictest	2307990	-21	kworker/u16:0+flush-8:0	09:43:12	5
1998337	99	41	39,2	cyclictest	2118967	-21	kworker/u16:1+flush-8:0	08:23:02	5
1998339	99	40	38,2	cyclictest	2429529	-21	kworker/u16:1+events_unbound	10:53:05	6
1998339	99	40	38,2	cyclictest	2429529	-21	kworker/u16:1+events_unbound	10:28:01	6
1998339	99	40	37,2	cyclictest	2320593	-21	kworker/u16:3+events_unbound	10:03:00	6
1997726	2	40	28,8	sleep4	0	-21	swapper/4	07:03:27	4
1998339	99	39	37,2	cyclictest	2587245	-21	kworker/u16:2+events_unbound	11:58:06	6
1998339	99	39	37,2	cyclictest	2515627	-21	kworker/u16:1+events_unbound	11:28:20	6
1998339	99	39	37,2	cyclictest	2454821	-21	kworker/u16:0+events_unbound	11:27:45	6
1998337	99	39	37,2	cyclictest	2381795	-21	kworker/u16:4+flush-8:0	10:23:12	5
1998337	99	39	36,2	cyclictest	2587245	-21	kworker/u16:2+events_unbound	11:53:11	5
1998339	99	38	36,2	cyclictest	1282076	-21	kworker/u16:0+flush-8:0	07:13:14	6
1998339	99	38	35,2	cyclictest	2225784	-21	kworker/u16:1+flush-8:0	09:33:20	6
1998337	99	38	36,2	cyclictest	2079548	-21	kworker/u16:0+events_unbound	08:08:13	5
1998339	99	37	36,1	cyclictest	2167234	-21	kworker/u16:4+events_unbound	08:43:14	6
1998339	99	37	35,2	cyclictest	2574758	-21	kworker/u16:3+events_unbound	11:38:20	6
1998337	99	37	36,1	cyclictest	2137903	-21	kworker/u16:3+events_unbound	08:18:03	5
1998337	99	37	35,2	cyclictest	2307990	-21	kworker/u16:0+events_unbound	09:51:14	5
1998337	99	37	34,2	cyclictest	2603509	-21	kworker/u16:1+events_unbound	11:51:16	5
1998337	99	37	34,2	cyclictest	2258977	-21	kworker/u16:5+events_unbound	09:23:00	5
1998344	99	36	31,4	cyclictest	2393596	-21	latency_hist	10:12:46	7
1998339	99	36	34,2	cyclictest	2429529	-21	kworker/u16:1+events_unbound	10:33:17	6
1998339	99	36	33,2	cyclictest	2272316	-21	kworker/u16:0+events_unbound	09:23:04	6
1998337	99	36	34,2	cyclictest	2454821	-21	kworker/u16:0+events_unbound	11:33:11	5
1998337	99	36	34,2	cyclictest	2454821	-21	kworker/u16:0+events_unbound	11:18:04	5
1998337	99	36	34,2	cyclictest	2381795	-21	kworker/u16:4+events_unbound	10:10:00	5
1998337	99	36	34,2	cyclictest	2258977	-21	kworker/u16:5+events_unbound	09:29:50	5
1998337	99	36	34,2	cyclictest	2021221	-21	kworker/u16:2+flush-8:0	07:28:15	5
1998337	99	36	33,2	cyclictest	2258977	-21	kworker/u16:5+events_unbound	09:18:03	5
1998339	99	35	33,2	cyclictest	2661079	-21	kworker/u16:4+flush-8:0	12:08:20	6
1998339	99	35	33,2	cyclictest	2454821	-21	kworker/u16:0+flush-8:0	10:41:05	6
1998339	99	35	33,2	cyclictest	2429529	-21	kworker/u16:1+events_unbound	10:48:10	6
1998339	99	35	33,2	cyclictest	2225784	-21	kworker/u16:1+events_unbound	09:28:18	6
1998339	99	35	30,2	cyclictest	2118967	-21	kworker/u16:1+flush-8:0	08:28:02	6
1998337	99	35	33,2	cyclictest	2587245	-21	kworker/u16:2+events_unbound	11:58:20	5
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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