OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #4

Rack #0/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #1/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #2/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #3/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #4/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #5/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #6/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #7/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #8/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #9/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #a/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #b/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #c/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #d/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #e/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #f/#0 #1 #2 #3 #4 #5 #6 #7 #8
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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.

Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: ondemand
Compare latency of primary with shadow system

Characteristics of the 50 highest latencies:

System rack5slot4s.osadl.org (updated Tue Jul 14, 2026 00:44:12)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
2079181	2	369	0,4	sleep3	0	-21	swapper/3	00:22:33	3
1985378	2	88	0,1	chrt	1985380	-21	kthreadcore	22:47:35	0
1918209	2	76	0,5	sleep3	0	-21	swapper/3	21:37:36	3
1767926	99	60	49,8	cyclictest	1894313	-21	latency_hist	21:15:01	1
1767922	99	57	17,26	cyclictest	0	-21	swapper/0	21:42:39	0
1767922	99	56	34,18	cyclictest	281	-21	systemd-journal	23:05:01	0
1763161	2	56	27,10	sleep1	0	-21	swapper/1	19:05:53	1
1767922	99	55	46,6	cyclictest	2033241	-21	latency_hist	23:35:02	0
1767922	99	55	46,6	cyclictest	2018377	-21	latency_hist	23:20:01	0
1767926	99	51	45,4	cyclictest	1753120	-21	kworker/u8:2+events_unbound	21:47:29	1
1767926	99	49	43,4	cyclictest	1904413	-21	kworker/u8:1+events_unbound	23:10:01	1
1767922	99	49	30,17	cyclictest	1959970	-21	irqrtprio	22:22:35	0
1767922	99	48	40,6	cyclictest	1948926	-21	latency_hist	22:10:01	0
1883628	2	45	0,3	chrt	584	-21	kworker/3:2+events	21:02:38	3
1767926	99	45	40,4	cyclictest	2008493	-21	kworker/u8:3+flush-8:0	23:32:46	1
1767926	99	45	39,5	cyclictest	1904413	-21	kworker/u8:1+flush-8:0	23:02:45	1
1767926	99	44	37,5	cyclictest	943196	-21	kworker/u8:1+events_unbound	20:32:46	1
1767926	99	43	35,6	cyclictest	2008493	-21	kworker/u8:3+events_unbound	23:37:28	1
1961889	2	42	0,2	chrt	0	-21	swapper/2	22:22:37	2
1767926	99	42	37,4	cyclictest	2008493	-21	kworker/u8:3+events_unbound	23:22:27	1
1767926	99	42	36,5	cyclictest	2048110	-21	kworker/u8:1+events_unbound	00:32:30	1
1767926	99	42	36,5	cyclictest	1753120	-21	kworker/u8:2+events_unbound	20:50:03	1
1767922	99	42	26,14	cyclictest	2082751	-21	cron	00:24:59	0
1767926	99	41	36,3	cyclictest	2048110	-21	kworker/u8:1+events_unbound	00:17:34	1
1767926	99	41	34,5	cyclictest	1939048	-21	kworker/u8:0+events_unbound	22:22:30	1
1767926	99	41	34,5	cyclictest	1753120	-21	kworker/u8:2+events_unbound	21:07:40	1
1767926	99	41	32,7	cyclictest	1943992	-21	latency_hist	22:05:01	1
1767922	99	41	30,8	cyclictest	1982987	-21	ntpq	22:42:38	0
1767926	99	40	36,3	cyclictest	1753120	-21	kworker/u8:2+events_unbound	20:27:48	1
1767926	99	40	33,5	cyclictest	1762890	-21	kworker/u8:3+flush-8:0	19:27:40	1
1767922	99	40	9,22	cyclictest	0	-21	swapper/0	20:23:46	0
1767922	99	40	31,7	cyclictest	281	-21	systemd-journal	20:37:33	0
1767922	99	40	31,6	cyclictest	281	-21	systemd-journal	00:27:33	0
1767922	99	40	10,17	cyclictest	1974499	-21	cpuspeed	22:37:28	0
1767926	99	39	35,3	cyclictest	1939048	-21	kworker/u8:0+events_unbound	23:00:00	1
1767926	99	39	34,4	cyclictest	943196	-21	kworker/u8:1+events_unbound	20:37:30	1
1767926	99	39	34,4	cyclictest	1884645	-21	kworker/u8:3+events_unbound	21:22:33	1
1767926	99	39	33,4	cyclictest	943196	-21	kworker/u8:1+events_unbound	19:47:30	1
1767926	99	39	32,5	cyclictest	1939048	-21	kworker/u8:0+events_unbound	23:27:34	1
1767926	99	39	32,5	cyclictest	1939048	-21	kworker/u8:0+events_unbound	23:12:28	1
1767922	99	39	21,16	cyclictest	1939012	-21	latency_hist	22:00:01	0
1767922	99	39	20,17	cyclictest	2090312	-21	tr	00:32:36	0
1767922	99	39	16,18	cyclictest	0	-21	swapper/0	20:12:28	0
1767926	99	38	33,4	cyclictest	1753120	-21	kworker/u8:2+events_unbound	19:22:39	1
1767926	99	38	33,3	cyclictest	1904413	-21	kworker/u8:1+events_unbound	22:47:35	1
1767926	99	38	32,5	cyclictest	943196	-21	kworker/u8:1+events_unbound	20:07:30	1
1767926	99	38	31,5	cyclictest	1762890	-21	kworker/u8:3+events_unbound	19:52:34	1
1767922	99	38	8,19	cyclictest	585	-21	runrttasks	20:18:49	0
1982774	2	37	0,2	sleep3	48	1	ktimers/3	22:42:36	3
1932213	2	37	0,3	sleep2	37	1	rcuc/2	21:52:36	2
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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