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 100 highest latencies:

System rack5slot4s.osadl.org (updated Mon Apr 20, 2026 12:44:15)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
3165724	2	200	0,3	sleep3	75	-21	kworker/3:1+events	11:11:17	3
2924266	99	54	50,3	cyclictest	3055177	-21	kworker/u8:3+flush-8:0	09:41:28	2
2924266	99	54	42,4	cyclictest	2924380	-21	kworker/u8:2+flush-8:0	08:16:23	2
2924263	99	53	46,5	cyclictest	3005694	-21	kworker/u8:0+events_unbound	08:31:25	1
2966065	2	51	0,6	sleep3	0	-21	swapper/3	07:50:00	3
2924263	99	51	47,3	cyclictest	3099384	-21	kworker/u8:2+flush-8:0	10:16:29	1
2924263	99	51	46,4	cyclictest	3169703	-21	kworker/u8:0+events_unbound	11:46:13	1
2924266	99	50	45,4	cyclictest	3099384	-21	kworker/u8:2+events_unbound	10:16:26	2
2924266	99	50	45,3	cyclictest	3223628	-21	kworker/u8:3+flush-8:0	12:16:27	2
2924258	99	50	40,7	cyclictest	3209561	-21	latency_hist	11:55:01	0
2924263	99	49	44,4	cyclictest	3194442	-21	kworker/u8:2+flush-8:0	12:01:24	1
2924263	99	49	44,4	cyclictest	3129618	-21	kworker/u8:1+events_unbound	11:16:27	1
2924258	99	49	39,7	cyclictest	2945886	-21	latency_hist	07:30:01	0
2924263	99	48	44,3	cyclictest	3194442	-21	kworker/u8:2+flush-8:0	12:11:26	1
2924263	99	48	44,3	cyclictest	2924380	-21	kworker/u8:2+flush-8:0	08:46:29	1
2924263	99	48	43,4	cyclictest	2892774	-21	kworker/u8:1+flush-8:0	07:36:14	1
2924263	99	48	43,3	cyclictest	3083952	-21	ntpq	09:46:21	1
2924263	99	48	43,3	cyclictest	2924380	-21	kworker/u8:2+flush-8:0	08:11:28	1
2924263	99	48	39,7	cyclictest	3074944	-21	latency_hist	09:40:01	1
2924263	99	48	37,8	cyclictest	280	-21	systemd-journal	10:45:01	1
2924258	99	48	1,45	cyclictest	1	-21	systemd	11:45:00	0
2924266	99	47	42,4	cyclictest	3169703	-21	kworker/u8:0+events_unbound	11:41:28	2
2924263	99	47	43,3	cyclictest	3169703	-21	kworker/u8:0+flush-8:0	12:06:29	1
2924263	99	47	42,3	cyclictest	2096582	-21	kworker/u8:4+events_unbound	08:01:27	1
2924263	99	47	41,4	cyclictest	3045502	-21	kworker/u8:2+events_unbound	09:26:13	1
2924263	99	47	37,8	cyclictest	3103766	-21	ntpq	10:06:22	1
2924263	99	47	37,8	cyclictest	3103766	-21	ntpq	10:06:22	1
2924258	99	47	40,5	cyclictest	2924085	-21	latency_hist	07:10:01	0
2924258	99	47	39,6	cyclictest	3133492	-21	ntpq	10:36:21	0
2924266	99	46	42,3	cyclictest	2924380	-21	kworker/u8:2+events_unbound	07:56:28	2
2924266	99	46	41,4	cyclictest	3169703	-21	kworker/u8:0+flush-8:0	12:36:24	2
2924263	99	46	42,3	cyclictest	3099384	-21	kworker/u8:2+flush-8:0	10:51:23	1
2924263	99	46	42,3	cyclictest	2096582	-21	kworker/u8:4+flush-8:0	07:31:27	1
2924263	99	46	40,5	cyclictest	3169703	-21	kworker/u8:0+events_unbound	11:56:23	1
2924263	99	46	36,7	cyclictest	3159336	-21	latency_hist	11:05:01	1
2924263	99	45	41,3	cyclictest	3236881	-21	kworker/u8:1+flush-8:0	12:26:26	1
2924263	99	45	41,3	cyclictest	3236881	-21	kworker/u8:1+flush-8:0	12:26:26	1
2924263	99	45	41,3	cyclictest	3065253	-21	kworker/u8:0+flush-8:0	10:01:27	1
2924263	99	45	40,4	cyclictest	3194442	-21	kworker/u8:2+flush-8:0	12:21:14	1
2924263	99	45	40,4	cyclictest	3099384	-21	kworker/u8:2+flush-8:0	10:21:23	1
2924263	99	44	41,2	cyclictest	3129618	-21	kworker/u8:1+events_unbound	10:36:09	1
2924263	99	44	40,3	cyclictest	3148887	-21	kworker/u8:3+flush-8:0	11:06:11	1
2924263	99	44	40,3	cyclictest	3119694	-21	kworker/u8:3+flush-8:0	10:26:14	1
2924263	99	44	40,3	cyclictest	3109776	-21	kworker/u8:0+flush-8:0	10:46:14	1
2924266	99	43	39,3	cyclictest	3055177	-21	kworker/u8:3+flush-8:0	09:51:25	2
2924263	99	43	39,3	cyclictest	2892774	-21	kworker/u8:1+events_unbound	07:16:11	1
2924263	99	43	36,5	cyclictest	2990980	-21	apt-get	08:16:08	1
2924263	99	43	35,3	cyclictest	3055177	-21	kworker/u8:3+events_unbound	09:56:29	1
2924263	99	43	32,8	cyclictest	280	-21	systemd-journal	11:32:52	1
2924263	99	43	29,9	cyclictest	280	-21	systemd-journal	12:20:00	1
2924258	99	43	38,3	cyclictest	3236881	-21	kworker/u8:1+events_unbound	12:31:11	0
2924263	99	42	38,3	cyclictest	3236881	-21	kworker/u8:1+flush-8:0	12:36:13	1
2924263	99	42	38,3	cyclictest	3129618	-21	kworker/u8:1+events_unbound	11:21:28	1
2924263	99	42	37,4	cyclictest	3055177	-21	kworker/u8:3+flush-8:0	09:41:15	1
2924263	99	42	33,7	cyclictest	2975845	-21	latency_hist	08:00:00	1
2924263	99	42	32,8	cyclictest	2096582	-21	kworker/u8:4+flush-8:0	07:11:15	1
2924266	99	41	37,3	cyclictest	3010667	-21	kworker/u8:3+flush-8:0	08:56:13	2
2924263	99	41	37,3	cyclictest	3119694	-21	kworker/u8:3+flush-8:0	10:31:14	1
2924263	99	41	37,3	cyclictest	3045502	-21	kworker/u8:2+events_unbound	09:21:12	1
2924263	99	41	37,3	cyclictest	2892774	-21	kworker/u8:1+events_unbound	08:26:28	1
2924263	99	41	35,4	cyclictest	3035632	-21	kworker/u8:1+events_unbound	09:31:15	1
2924266	99	40	36,3	cyclictest	3065253	-21	kworker/u8:0+flush-8:0	09:31:30	2
2924263	99	40	36,3	cyclictest	3169703	-21	kworker/u8:0+events_unbound	11:26:27	1
2924263	99	40	36,3	cyclictest	2924380	-21	kworker/u8:2+flush-8:0	08:06:11	1
2924263	99	40	36,3	cyclictest	2924380	-21	kworker/u8:2+flush-8:0	08:06:11	1
2924263	99	40	35,4	cyclictest	3069686	-21	kworker/u8:4+events_unbound	10:11:29	1
2924263	99	40	35,4	cyclictest	3010667	-21	kworker/u8:3+flush-8:0	08:36:42	1
2924263	99	40	31,7	cyclictest	3244499	-21	/usr/sbin/munin	12:31:21	1
2924258	99	40	34,4	cyclictest	3149735	-21	apt-get	10:56:08	0
2924266	99	39	35,3	cyclictest	2924380	-21	kworker/u8:2+events_unbound	08:06:26	2
2924266	99	39	35,3	cyclictest	2924380	-21	kworker/u8:2+events_unbound	08:06:26	2
2924263	99	39	35,3	cyclictest	3129618	-21	kworker/u8:1+events_unbound	11:36:10	1
2924258	99	39	33,4	cyclictest	280	-21	systemd-journal	09:21:10	0
2924263	99	38	34,3	cyclictest	3154079	-21	kworker/u8:2+flush-8:0	11:11:22	1
2924263	99	38	34,3	cyclictest	3069686	-21	kworker/u8:4+flush-8:0	09:51:15	1
2924263	99	38	34,3	cyclictest	2924380	-21	kworker/u8:2+events_unbound	08:41:27	1
2924263	99	38	33,3	cyclictest	2924380	-21	kworker/u8:2+events_unbound	07:41:18	1
2924258	99	38	31,5	cyclictest	280	-21	systemd-journal	10:14:59	0
2924266	99	37	33,3	cyclictest	3169703	-21	kworker/u8:0+events_unbound	11:46:21	2
2924266	99	37	33,3	cyclictest	2096582	-21	kworker/u8:4+events_unbound	08:01:18	2
2924263	99	37	33,3	cyclictest	3045502	-21	kworker/u8:2+flush-8:0	09:11:14	1
2924263	99	37	33,3	cyclictest	3035632	-21	kworker/u8:1+events_unbound	09:16:31	1
2924263	99	37	33,3	cyclictest	3010667	-21	kworker/u8:3+events_unbound	09:00:10	1
2924263	99	37	27,7	cyclictest	280	-21	systemd-journal	07:52:09	1
2924258	99	37	26,8	cyclictest	2950846	-21	latency_hist	07:35:01	0
2924266	99	36	27,7	cyclictest	280	-21	systemd-journal	11:35:00	2
2924263	99	36	31,4	cyclictest	2924380	-21	kworker/u8:2+events_unbound	08:51:07	1
2924263	99	36	31,4	cyclictest	2892774	-21	kworker/u8:1+events_unbound	08:23:46	1
2924258	99	36	29,5	cyclictest	3109831	-21	/usr/sbin/munin	10:16:21	0
2924258	99	36	27,7	cyclictest	3004620	-21	ntpq	08:26:22	0
2924258	99	36	25,9	cyclictest	3120044	-21	diskstats	10:26:13	0
2924258	99	36	25,8	cyclictest	3010667	-21	kworker/u8:3+events_unbound	08:56:10	0
2924263	99	35	31,3	cyclictest	3194442	-21	kworker/u8:2+flush-8:0	11:51:14	1
2924263	99	35	25,8	cyclictest	2965107	-21	ntpq	07:46:24	1
2924052	2	35	2,28	sleep3	0	-21	swapper/3	07:09:45	3
2923948	2	35	4,9	sleep1	0	-21	swapper/1	07:08:21	1
3095291	2	34	0,2	sleep2	0	-21	swapper/2	10:01:13	2
2924263	99	34	22,4	cyclictest	3169703	-21	kworker/u8:0+events_unbound	11:41:36	1
2924258	99	34	30,3	cyclictest	3119694	-21	kworker/u8:3+events_unbound	10:31:19	0
2924258	99	34	27,5	cyclictest	3184630	-21	true	11:30:00	0
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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