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
Special All - All RT - Optimization - Ethernet - Thumbnails - Next

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 100 highest latencies:

System rack5slot4s.osadl.org (updated Tue Jul 28, 2026 12:44:13)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
3869985	99	209	196,11	cyclictest	4109425	-21	ntpq	11:08:04	2
3869975	99	202	183,17	cyclictest	0	-21	swapper/0	11:08:05	0
4103715	2	81	0,3	chrt	583	-21	kworker/3:2-events	11:02:59	3
4058433	2	63	0,1	sleep1	4058439	-21	kthreadcore	10:17:59	1
3869983	99	62	57,3	cyclictest	0	-21	swapper/1	11:08:04	1
4111714	2	59	0,5	chrt	0	-21	swapper/0	11:12:59	0
3869983	99	54	45,6	cyclictest	3985856	-21	kworker/u8:1+flush-8:0	09:43:05	1
3869983	99	53	48,3	cyclictest	4075465	-21	kworker/u8:2+events_unbound	12:00:00	1
3869983	99	51	44,4	cyclictest	3951497	-21	kworker/u8:3+events_unbound	09:28:09	1
3869983	99	48	41,5	cyclictest	3828544	-21	kworker/u8:2+events_unbound	07:18:08	1
3869983	99	48	39,6	cyclictest	3891600	-21	latency_hist	07:30:00	1
3869983	99	48	39,6	cyclictest	3891600	-21	latency_hist	07:30:00	1
3869983	99	47	39,5	cyclictest	4129883	-21	latency_hist	11:30:01	1
3869985	99	44	36,5	cyclictest	278	-21	systemd-journal	08:40:00	2
3869983	99	43	37,4	cyclictest	4169717	-21	kworker/u8:3+events_unbound	12:13:11	1
3869983	99	43	37,3	cyclictest	3985856	-21	kworker/u8:1+events_unbound	10:07:35	1
3869975	99	43	34,6	cyclictest	4040617	-21	latency_hist	10:00:01	0
3869975	99	43	34,6	cyclictest	4014912	-21	ntpq	09:33:02	0
3869975	99	43	2,32	cyclictest	3946348	-21	kworker/0:0+events	08:32:50	0
3869983	99	42	37,3	cyclictest	4075465	-21	kworker/u8:2+flush-8:0	10:47:58	1
3869983	99	42	37,3	cyclictest	3995962	-21	kworker/u8:2+flush-8:0	09:52:54	1
3869983	99	42	32,7	cyclictest	4179569	-21	latency_hist	12:20:01	1
3869975	99	42	36,4	cyclictest	3921807	-21	kworker/u8:2+flush-8:0	08:08:06	0
3869975	99	42	31,8	cyclictest	3881087	-21	ntpq	07:18:05	0
3865209	2	42	28,9	sleep1	0	-21	swapper/1	07:05:42	1
3869983	99	41	36,3	cyclictest	4010722	-21	kworker/u8:0+events_unbound	09:33:07	1
3869975	99	41	33,6	cyclictest	4041067	-21	/usr/sbin/munin	10:03:05	0
3869975	99	41	32,6	cyclictest	278	-21	systemd-journal	11:32:17	0
3869983	99	40	35,3	cyclictest	3946330	-21	kworker/u8:0+events_unbound	08:57:57	1
3869983	99	40	34,4	cyclictest	3946330	-21	kworker/u8:0+events_unbound	09:02:56	1
3869983	99	40	33,5	cyclictest	4100968	-21	cut	11:02:53	1
3869983	99	40	32,6	cyclictest	3932277	-21	cut	08:12:54	1
3869983	99	40	32,5	cyclictest	2500684	-21	kworker/u8:0+events_unbound	07:48:03	1
3869975	99	40	33,5	cyclictest	3985856	-21	kworker/u8:1+flush-8:0	09:12:56	0
3869983	99	39	33,4	cyclictest	4075465	-21	kworker/u8:2+events_unbound	11:18:02	1
3869983	99	39	30,7	cyclictest	4065356	-21	kworker/u8:3+flush-8:0	11:23:07	1
3869975	99	39	30,6	cyclictest	4090325	-21	latency_hist	10:50:01	0
3869975	99	39	30,6	cyclictest	3869807	-21	latency_hist	07:10:01	0
3869983	99	38	34,3	cyclictest	4110097	-21	kworker/u8:0+flush-8:0	11:48:09	1
3869983	99	38	30,5	cyclictest	4060866	-21	/usr/sbin/munin	10:23:04	1
3869975	99	36	2,32	cyclictest	3855178	-21	kworker/0:1+events	07:22:50	0
3869975	99	36	1,30	cyclictest	4085406	-21	kworker/0:2+events	11:41:00	0
3869975	99	36	1,28	cyclictest	3946348	-21	kworker/0:0+events	08:42:50	0
3869983	99	35	30,3	cyclictest	3946330	-21	kworker/u8:0+flush-8:0	08:48:00	1
3869983	99	35	25,8	cyclictest	3912146	-21	/usr/sbin/munin	07:53:06	1
3869975	99	35	2,26	cyclictest	3855178	-21	kworker/0:1+events	08:27:48	0
3869975	99	35	1,32	cyclictest	3946348	-21	kworker/0:0+events	09:24:24	0
3869975	99	35	11,22	cyclictest	4020661	-21	kworker/0:1+events	10:43:04	0
3952085	2	34	0,2	sleep3	47	1	rcuc/3	08:32:54	3
3869985	99	34	26,6	cyclictest	3906496	-21	apt-get	07:45:00	2
3869983	99	34	28,4	cyclictest	4110097	-21	kworker/u8:0+events_unbound	11:43:06	1
3869983	99	34	28,4	cyclictest	3828544	-21	kworker/u8:2+flush-8:0	07:32:58	1
3869975	99	34	2,30	cyclictest	3946348	-21	kworker/0:0+events	09:08:06	0
3869983	99	33	28,3	cyclictest	4164762	-21	cron	12:05:00	1
3869983	99	33	27,4	cyclictest	4149963	-21	kworker/u8:1+events_unbound	12:38:08	1
3869983	99	33	27,4	cyclictest	2500684	-21	kworker/u8:0+flush-8:0	08:03:05	1
3869983	99	33	27,3	cyclictest	4065356	-21	kworker/u8:3+events_unbound	10:57:57	1
3869983	99	33	25,6	cyclictest	3921807	-21	kworker/u8:2+flush-8:0	08:28:03	1
3869983	99	32	26,4	cyclictest	4065356	-21	kworker/u8:3+events_unbound	11:13:07	1
3869983	99	32	26,4	cyclictest	3828544	-21	kworker/u8:2+flush-8:0	07:13:04	1
3869975	99	32	26,4	cyclictest	3921807	-21	kworker/u8:2+flush-8:0	08:12:57	0
3869975	99	32	2,28	cyclictest	4085406	-21	kworker/0:2+events	11:38:04	0
3869975	99	32	2,25	cyclictest	4010739	-21	kworker/0:2+events	09:50:02	0
3869975	99	32	10,20	cyclictest	4085406	-21	kworker/0:2+events	12:08:10	0
3869983	99	31	26,3	cyclictest	4149963	-21	kworker/u8:1+events_unbound	12:33:02	1
3869975	99	31	3,26	cyclictest	3855178	-21	kworker/0:1+events	07:38:08	0
3869975	99	31	26,3	cyclictest	3925748	-21	needreboot	08:03:02	0
3869975	99	31	26,3	cyclictest	1	-21	systemd	12:29:09	0
3869975	99	31	2,28	cyclictest	4020661	-21	kworker/0:1+events	10:23:02	0
3869975	99	31	2,27	cyclictest	4010739	-21	kworker/0:2+events	09:43:06	0
3869975	99	31	1,28	cyclictest	3855178	-21	kworker/0:1+events	07:57:50	0
3869985	99	30	22,6	cyclictest	4080204	-21	apt-get	10:40:00	2
3869983	99	30	26,2	cyclictest	4069513	-21	needreboot	10:28:00	1
3869983	99	30	23,5	cyclictest	3869849	-21	kworker/u8:3+events_unbound	07:37:53	1
3869983	99	30	23,5	cyclictest	3828544	-21	kworker/u8:2+flush-8:0	07:23:05	1
3869983	99	30	22,6	cyclictest	4110097	-21	kworker/u8:0+events_unbound	11:52:56	1
3869983	99	30	21,7	cyclictest	4084619	-21	ntpq	10:43:03	1
3869983	99	30	19,8	cyclictest	4074480	-21	ntpq	10:33:01	1
3869975	99	30	3,26	cyclictest	4085406	-21	kworker/0:2+events	12:13:06	0
3869975	99	30	25,3	cyclictest	4075465	-21	kworker/u8:2+flush-8:0	11:57:59	0
3869975	99	30	2,27	cyclictest	3946348	-21	kworker/0:0+events	08:52:55	0
3869975	99	30	2,26	cyclictest	4085406	-21	kworker/0:2+events	12:18:04	0
3869975	99	30	2,26	cyclictest	4085406	-21	kworker/0:2+events	11:18:06	0
3869975	99	30	2,26	cyclictest	4085406	-21	kworker/0:2+events	11:03:04	0
3869975	99	30	2,26	cyclictest	4085406	-21	kworker/0:2+events	10:57:50	0
3869975	99	30	2,26	cyclictest	3946348	-21	kworker/0:0+events	08:48:00	0
3869975	99	30	2,22	cyclictest	4020661	-21	kworker/0:1+events	10:30:12	0
3869985	99	29	19,8	cyclictest	278	-21	systemd-journal	11:48:17	2
3869983	99	29	25,2	cyclictest	3901408	-21	kworker/u8:1+events_unbound	07:43:01	1
3869983	99	29	24,4	cyclictest	3951497	-21	kworker/u8:3+flush-8:0	09:23:03	1
3869983	99	29	24,4	cyclictest	3951497	-21	kworker/u8:3+events_unbound	09:08:10	1
3869983	99	29	24,3	cyclictest	3985856	-21	kworker/u8:1+events_unbound	10:13:00	1
3869983	99	29	24,3	cyclictest	3985856	-21	kworker/u8:1+events_unbound	10:12:59	1
3869983	99	29	24,3	cyclictest	3917811	-21	irqrtprio	07:57:58	1
3869983	99	29	23,5	cyclictest	3985856	-21	kworker/u8:1+events_unbound	09:12:54	1
3869983	99	29	22,5	cyclictest	3961626	-21	apt-get	08:42:49	1
3869983	99	29	22,5	cyclictest	3940609	-21	ntpq	08:18:02	1
3869983	99	29	21,6	cyclictest	3985856	-21	kworker/u8:1+flush-8:0	09:38:08	1
3869975	99	29	6,22	cyclictest	4020661	-21	kworker/0:1+events	10:07:54	0
3869975	99	29	5,18	cyclictest	3946348	-21	kworker/0:0+events	09:00:04	0
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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