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 Tue Jul 14, 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
191774	2	99	2,95	sleep7	0	-21	swapper/7	19:09:51	7
191563	2	91	74,14	sleep5	0	-21	swapper/5	19:06:53	5
191698	2	83	79,3	sleep6	0	-21	swapper/6	19:08:46	6
709235	2	65	0,1	sleep7	709236	-21	grep	23:05:17	7
191600	2	37	17,8	sleep4	0	-21	swapper/4	19:07:24	4
199732	2	28	0,1	chrt	0	-21	swapper/5	19:10:21	5
192185	99	27	24,2	cyclictest	292572	-21	kworker/u16:0+events_unbound	20:14:59	4
192191	99	25	23,1	cyclictest	0	-21	swapper/7	22:44:59	7
192190	99	24	22,2	cyclictest	840838	-21	kworker/u16:4+flush-8:0	00:25:40	6
192189	99	24	22,2	cyclictest	205761	-21	kworker/u16:4+events_unbound	19:40:14	5
192191	99	23	2,14	cyclictest	0	-21	swapper/7	22:54:01	7
192191	99	22	20,1	cyclictest	0	-21	swapper/7	21:19:59	7
192191	99	22	18,2	cyclictest	720235	-21	iostat_ios	23:10:15	7
192191	99	22	17,4	cyclictest	397763	-21	cat	20:50:31	7
192191	99	21	18,2	cyclictest	928983	-21	grep	00:35:18	7
192191	99	21	18,2	cyclictest	788886	-21	smartctl	23:35:30	7
192191	99	21	1,13	cyclictest	839909	-21	ssh	23:59:09	7
192190	99	21	19,2	cyclictest	571731	-21	kworker/u16:3+flush-8:0	22:15:38	6
192189	99	21	19,2	cyclictest	755267	-21	kworker/u16:0+events_unbound	23:55:30	5
192189	99	21	19,2	cyclictest	571731	-21	kworker/u16:3+events_unbound	22:20:07	5
192191	99	20	17,2	cyclictest	266739	-21	grep	19:45:19	7
192191	99	20	0,18	cyclictest	648	-21	systemd-journal	19:54:54	7
192190	99	20	18,2	cyclictest	193143	-21	kworker/u16:3+events_unbound	19:35:29	6
192189	99	20	18,2	cyclictest	840838	-21	kworker/u16:4+events_unbound	00:25:14	5
192189	99	20	18,2	cyclictest	634033	-21	kworker/u16:1+flush-8:0	00:00:18	5
192191	99	19	18,0	cyclictest	0	-21	swapper/7	23:45:37	7
192190	99	19	17,2	cyclictest	427929	-21	kworker/u16:1+events_unbound	21:20:06	6
192189	99	19	17,2	cyclictest	755267	-21	kworker/u16:0+events_unbound	23:40:38	5
192189	99	19	17,2	cyclictest	634033	-21	kworker/u16:1+flush-8:0	23:10:32	5
192185	99	19	15,3	cyclictest	427371	-21	latency_hist	21:09:59	4
192185	99	19	0,14	cyclictest	0	-21	swapper/4	22:54:04	4
192191	99	18	17,0	cyclictest	0	-21	swapper/7	22:00:37	7
192191	99	18	17,0	cyclictest	0	-21	swapper/7	20:30:35	7
192191	99	18	17,0	cyclictest	0	-21	swapper/7	20:30:35	7
192190	99	18	16,2	cyclictest	399584	-21	kworker/u16:0+events_unbound	21:49:54	6
192190	99	18	16,1	cyclictest	0	-21	swapper/6	23:07:43	6
192189	99	18	5,5	cyclictest	0	-21	swapper/5	20:49:55	5
192189	99	18	16,2	cyclictest	634033	-21	kworker/u16:1+flush-8:0	23:21:05	5
192189	99	18	16,2	cyclictest	634033	-21	kworker/u16:1+events_unbound	00:05:04	5
192191	99	17	16,0	cyclictest	0	-21	swapper/7	20:55:28	7
192191	99	17	16,0	cyclictest	0	-21	swapper/7	20:40:31	7
192191	99	17	0,16	cyclictest	488194	-21	turbostat	21:34:58	7
192190	99	17	15,2	cyclictest	399584	-21	kworker/u16:0+events_unbound	20:57:06	6
192190	99	17	15,2	cyclictest	361176	-21	kworker/u16:0+flush-8:0	20:35:25	6
192189	99	17	15,2	cyclictest	427929	-21	kworker/u16:1+flush-8:0	22:00:04	5
192189	99	17	15,2	cyclictest	427929	-21	kworker/u16:1+flush-8:0	21:45:28	5
192189	99	17	15,2	cyclictest	300859	-21	kworker/u16:2+flush-8:0	21:40:27	5
192189	99	17	15,2	cyclictest	300859	-21	kworker/u16:2+events_unbound	22:31:49	5
192189	99	17	15,2	cyclictest	205761	-21	kworker/u16:4+events_unbound	19:20:28	5
512080	2	16	0,0	sleep7	512081	-21	sh	21:44:15	7
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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