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 Sat Aug 01, 2026 00:44:15)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
1141009	2	319	0,2	sleep3	575	-21	kworker/3:2+events	21:18:02	3
1282545	2	73	0,5	chrt	45	1	irq_work/3	23:42:58	3
1208303	2	63	0,16	chrt	575	-21	kworker/3:2+events	22:27:59	3
1011305	99	55	0,33	cyclictest	1019052	-21	sshd	19:17:58	0
1011308	99	54	48,4	cyclictest	1092793	-21	kworker/u8:3+events_unbound	20:52:57	1
1011308	99	54	47,5	cyclictest	195620	-21	kworker/u8:0+flush-8:0	19:13:12	1
1011308	99	52	43,6	cyclictest	1291523	-21	latency_hist	23:50:01	1
1011308	99	51	46,4	cyclictest	1127720	-21	kworker/u8:0+flush-8:0	21:38:10	1
1011308	99	51	46,3	cyclictest	1132904	-21	kworker/u8:1+events_unbound	21:15:01	1
1011308	99	50	44,4	cyclictest	1092793	-21	kworker/u8:3+events_unbound	20:48:11	1
1011308	99	49	44,3	cyclictest	1336791	-21	latency_hist	00:40:01	1
1011308	99	49	44,3	cyclictest	1132904	-21	kworker/u8:1+events_unbound	22:08:12	1
1011305	99	48	26,6	cyclictest	1057723	-21	latency_hist	19:55:01	0
1011305	99	48	26,6	cyclictest	1057723	-21	latency_hist	19:55:00	0
1011305	99	48	21,9	cyclictest	1295702	-21	ntpq	23:53:05	0
1011308	99	45	39,4	cyclictest	979851	-21	kworker/u8:3+flush-8:0	19:22:57	1
1011308	99	44	39,3	cyclictest	1217344	-21	kworker/u8:2+events_unbound	00:30:00	1
1011308	99	44	37,5	cyclictest	1212334	-21	kworker/u8:0+flush-8:0	22:33:09	1
1011305	99	44	22,6	cyclictest	1182075	-21	latency_hist	22:00:00	0
1278212	2	43	0,3	chrt	575	-21	kworker/3:2-events	23:38:00	3
1011308	99	43	39,3	cyclictest	195620	-21	kworker/u8:0+events_unbound	19:53:00	1
1011308	99	43	39,3	cyclictest	195620	-21	kworker/u8:0+events_unbound	19:53:00	1
1011308	99	43	38,4	cyclictest	1217344	-21	kworker/u8:2+events_unbound	23:30:01	1
1011308	99	42	32,8	cyclictest	1077722	-21	latency_hist	20:15:01	1
1011308	99	41	38,2	cyclictest	1236878	-21	kworker/u8:3+events_unbound	23:45:01	1
1011308	99	41	37,3	cyclictest	1236878	-21	kworker/u8:3+events_unbound	23:07:57	1
1011310	99	40	33,5	cyclictest	275	-21	systemd-journal	00:15:00	2
1011308	99	40	35,4	cyclictest	1132904	-21	kworker/u8:1+events_unbound	21:22:56	1
1011308	99	40	35,4	cyclictest	1016325	-21	kworker/u8:2+events_unbound	19:37:53	1
1011308	99	40	31,7	cyclictest	1052745	-21	latency_hist	19:50:00	1
1011308	99	39	34,4	cyclictest	1016325	-21	kworker/u8:2+events_unbound	20:43:05	1
1011308	99	39	34,3	cyclictest	1266355	-21	kworker/u8:0+events_unbound	23:37:59	1
1011308	99	39	33,4	cyclictest	1217344	-21	kworker/u8:2+flush-8:0	23:58:11	1
1011308	99	39	32,5	cyclictest	1217344	-21	kworker/u8:2+flush-8:0	22:48:09	1
1011310	99	38	27,9	cyclictest	1057728	-21	apt-get	19:55:01	2
1011310	99	38	27,9	cyclictest	1057728	-21	apt-get	19:55:00	2
1011308	99	38	34,3	cyclictest	195620	-21	kworker/u8:0+events_unbound	19:28:06	1
1011308	99	38	33,3	cyclictest	1132904	-21	kworker/u8:1+events_unbound	22:52:58	1
1011308	99	38	32,5	cyclictest	195620	-21	kworker/u8:0+flush-8:0	19:32:58	1
1011308	99	38	32,5	cyclictest	1016325	-21	kworker/u8:2+flush-8:0	19:43:10	1
1011308	99	38	32,4	cyclictest	1132904	-21	kworker/u8:1+flush-8:0	21:33:10	1
1011310	99	37	29,6	cyclictest	1301422	-40	logrotate	00:00:01	2
1011308	99	37	32,4	cyclictest	1266355	-21	kworker/u8:0+flush-8:0	23:33:04	1
1011308	99	37	29,6	cyclictest	275	-21	systemd-journal	23:53:13	1
1011308	99	36	32,3	cyclictest	1052760	-21	kworker/u8:1+events_unbound	20:57:58	1
1011078	2	36	4,11	sleep2	0	-21	swapper/2	19:09:23	2
1006606	2	36	3,10	sleep1	0	-21	swapper/1	19:07:10	1
1011308	99	35	31,3	cyclictest	1016325	-21	kworker/u8:2+events_unbound	20:28:06	1
1011305	99	35	8,25	cyclictest	1062957	-21	kworker/0:2+events	21:52:56	0
1011310	99	34	24,8	cyclictest	1152408	-21	awk	21:30:00	2
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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