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 Thu Jul 02, 2026 12:44:16)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
486248	99	184	167,14	cyclictest	0	-21	swapper/0	10:40:01	0
486257	99	172	168,2	cyclictest	0	-21	swapper/2	10:40:01	2
486253	99	65	59,4	cyclictest	646556	-21	kworker/u8:2+events_unbound	09:45:29	1
486253	99	61	54,5	cyclictest	721930	-21	kworker/u8:4+events_unbound	12:05:27	1
486253	99	59	53,4	cyclictest	679833	-21	kworker/u8:2+events_unbound	12:25:25	1
486253	99	57	50,5	cyclictest	721930	-21	kworker/u8:4+events_unbound	11:50:22	1
492859	2	55	0,1	sleep1	492863	-21	grep	07:15:04	1
486253	99	55	51,3	cyclictest	627633	-21	kworker/u8:3+events_unbound	09:40:31	1
486253	99	54	50,3	cyclictest	651510	-21	kworker/u8:0+flush-8:0	09:50:32	1
486253	99	54	49,4	cyclictest	721930	-21	kworker/u8:4+flush-8:0	12:10:29	1
486253	99	54	48,5	cyclictest	601694	-21	kworker/u8:1+events_unbound	09:25:24	1
486253	99	53	48,4	cyclictest	721930	-21	kworker/u8:4+flush-8:0	11:35:27	1
486253	99	53	48,4	cyclictest	601694	-21	kworker/u8:1+events_unbound	09:55:25	1
486253	99	53	48,3	cyclictest	679833	-21	kworker/u8:2+events_unbound	11:30:24	1
486253	99	52	45,6	cyclictest	3840457	-21	kworker/u8:0+flush-8:0	08:25:26	1
486253	99	52	44,5	cyclictest	601694	-21	kworker/u8:1+flush-8:0	09:00:29	1
486248	99	52	42,7	cyclictest	742380	-21	latency_hist	11:25:01	0
486248	99	52	42,7	cyclictest	742380	-21	latency_hist	11:25:01	0
486248	99	52	40,9	cyclictest	747847	-21	diskstats	11:30:12	0
486253	99	51	45,4	cyclictest	601694	-21	kworker/u8:1+events_unbound	09:20:13	1
486253	99	50	40,8	cyclictest	576598	-21	ntpq	08:35:23	1
486253	99	49	44,4	cyclictest	679833	-21	kworker/u8:2+events_unbound	11:15:27	1
486253	99	49	44,4	cyclictest	679833	-21	kworker/u8:2+events_unbound	11:15:27	1
486253	99	48	44,3	cyclictest	727108	-21	kworker/u8:0+flush-8:0	11:20:26	1
486253	99	48	44,3	cyclictest	727108	-21	kworker/u8:0+flush-8:0	11:20:25	1
486253	99	48	44,3	cyclictest	627633	-21	kworker/u8:3+flush-8:0	10:05:28	1
486253	99	48	43,4	cyclictest	679833	-21	kworker/u8:2+events_unbound	12:30:13	1
486253	99	48	43,4	cyclictest	679833	-21	kworker/u8:2+events_unbound	11:45:26	1
486253	99	48	42,5	cyclictest	601694	-21	kworker/u8:1+events_unbound	09:15:26	1
486253	99	47	43,3	cyclictest	517855	-21	kworker/u8:3+flush-8:0	08:10:28	1
486248	99	47	37,8	cyclictest	490200	-21	ntpq	07:10:23	0
486253	99	46	41,4	cyclictest	679833	-21	kworker/u8:2+flush-8:0	10:30:16	1
486253	99	46	41,4	cyclictest	3840457	-21	kworker/u8:0+flush-8:0	07:10:25	1
486253	99	46	41,3	cyclictest	627633	-21	kworker/u8:3+events_unbound	10:10:27	1
486253	99	46	40,4	cyclictest	601694	-21	kworker/u8:1+events_unbound	09:05:24	1
486253	99	45	39,5	cyclictest	651510	-21	kworker/u8:0+events_unbound	11:00:14	1
486248	99	45	39,4	cyclictest	601694	-21	kworker/u8:1+events_unbound	09:55:22	0
486253	99	44	40,3	cyclictest	540453	-21	kworker/u8:2+flush-8:0	09:10:25	1
486253	99	44	39,3	cyclictest	651510	-21	kworker/u8:0+events_unbound	10:45:23	1
486253	99	44	35,7	cyclictest	526845	-21	ntpq	07:45:23	1
486248	99	44	34,8	cyclictest	731446	-21	ntpq	11:10:22	0
486253	99	43	39,3	cyclictest	721930	-21	kworker/u8:4+flush-8:0	11:40:32	1
486253	99	43	39,3	cyclictest	540453	-21	kworker/u8:2+flush-8:0	08:50:30	1
486253	99	43	39,3	cyclictest	3846125	-21	kworker/u8:2+flush-8:0	07:30:26	1
486253	99	43	38,3	cyclictest	517855	-21	kworker/u8:3+events_unbound	08:10:00	1
486253	99	43	36,4	cyclictest	679833	-21	kworker/u8:2+events_unbound	11:05:24	1
486253	99	43	32,8	cyclictest	1704890	-21	systemd-journal	12:18:43	1
486253	99	42	38,3	cyclictest	517855	-21	kworker/u8:3+flush-8:0	08:15:11	1
486253	99	42	38,3	cyclictest	3840457	-21	kworker/u8:0+flush-8:0	08:40:26	1
486253	99	42	36,5	cyclictest	679833	-21	kworker/u8:2+events_unbound	10:55:15	1
486253	99	42	36,4	cyclictest	679833	-21	kworker/u8:2+events_unbound	10:25:13	1
486248	99	42	35,5	cyclictest	3846125	-21	kworker/u8:2+flush-8:0	07:20:23	0
486253	99	41	37,3	cyclictest	721930	-21	kworker/u8:4+events_unbound	11:25:12	1
486253	99	41	37,3	cyclictest	3846125	-21	kworker/u8:2+flush-8:0	07:25:28	1
486253	99	41	36,4	cyclictest	517855	-21	kworker/u8:3+events_unbound	08:20:26	1
486253	99	41	35,5	cyclictest	727108	-21	kworker/u8:0+events_unbound	11:10:11	1
486253	99	40	36,3	cyclictest	721930	-21	kworker/u8:4+flush-8:0	11:55:25	1
486257	99	39	33,4	cyclictest	646556	-21	kworker/u8:2+flush-8:0	09:50:13	2
486253	99	39	35,3	cyclictest	3840457	-21	kworker/u8:0+flush-8:0	08:30:16	1
486253	99	39	35,3	cyclictest	3840457	-21	kworker/u8:0+flush-8:0	07:40:20	1
486253	99	39	34,3	cyclictest	679833	-21	kworker/u8:2+events_unbound	10:35:23	1
486253	99	39	31,6	cyclictest	542644	-21	latency_hist	08:05:01	1
486253	99	39	31,6	cyclictest	542644	-21	latency_hist	08:05:01	1
486248	99	39	34,4	cyclictest	627633	-21	kworker/u8:3+events_unbound	09:45:18	0
486253	99	38	31,5	cyclictest	802080	-21	latency_hist	12:25:01	1
486248	99	38	32,5	cyclictest	679833	-21	kworker/u8:2+events_unbound	11:45:27	0
486253	99	37	32,3	cyclictest	582343	-21	kworker/u8:3+events_unbound	08:59:42	1
486253	99	36	32,3	cyclictest	707452	-21	kworker/u8:1+events_unbound	10:50:44	1
486253	99	36	32,3	cyclictest	627633	-21	kworker/u8:3+events_unbound	10:15:23	1
486248	99	36	25,9	cyclictest	658674	-21	kthreadcore	10:00:18	0
486257	99	35	30,3	cyclictest	679833	-21	kworker/u8:2+events_unbound	11:10:43	2
486253	99	35	31,3	cyclictest	627633	-21	kworker/u8:3+events_unbound	09:35:28	1
486253	99	35	31,3	cyclictest	486102	-21	kworker/u8:1+events_unbound	07:55:11	1
486253	99	35	31,3	cyclictest	486102	-21	kworker/u8:1+events_unbound	07:55:11	1
486257	99	34	29,4	cyclictest	679833	-21	kworker/u8:2+events_unbound	12:30:29	2
486253	99	34	29,3	cyclictest	697770	-21	kworker/u8:3+events_unbound	10:40:21	1
486253	99	34	28,4	cyclictest	601694	-21	kworker/u8:1+events_unbound	10:00:17	1
486248	99	34	27,5	cyclictest	512487	-21	grep	07:30:31	0
486257	99	33	28,4	cyclictest	1704890	-21	systemd-journal	10:35:00	2
486257	99	33	27,4	cyclictest	540453	-21	kworker/u8:2+flush-8:0	08:45:28	2
486257	99	32	28,3	cyclictest	679833	-21	kworker/u8:2+flush-8:0	10:20:28	2
486253	99	32	27,4	cyclictest	679833	-21	kworker/u8:2+events_unbound	10:20:46	1
486248	99	32	5,25	cyclictest	491152	-21	kworker/0:0+events	10:05:21	0
486248	99	32	27,4	cyclictest	3840457	-21	kworker/u8:0+flush-8:0	08:30:31	0
486248	99	32	26,4	cyclictest	637131	-21	unixbench_singl	09:35:31	0
486248	99	32	26,4	cyclictest	582343	-21	kworker/u8:3+flush-8:0	08:45:15	0
486248	99	32	25,5	cyclictest	679833	-21	kworker/u8:2+events_unbound	10:50:12	0
486248	99	32	24,6	cyclictest	3840457	-21	kworker/u8:0+flush-8:0	07:40:24	0
486248	99	32	24,6	cyclictest	1704890	-21	systemd-journal	07:55:00	0
486257	99	31	26,4	cyclictest	517810	-21	idleruntime-cro	07:40:00	2
486253	99	31	27,3	cyclictest	601694	-21	kworker/u8:1+events_unbound	09:30:13	1
486253	99	31	27,3	cyclictest	3846125	-21	kworker/u8:2+flush-8:0	07:20:30	1
486253	99	31	26,4	cyclictest	679833	-21	kworker/u8:2+events_unbound	12:35:17	1
486248	99	31	27,3	cyclictest	791919	-21	cron	12:15:01	0
486248	99	31	27,3	cyclictest	679833	-21	kworker/u8:2+flush-8:0	10:30:30	0
486248	99	31	27,2	cyclictest	642526	-21	systemd-run	09:45:00	0
486248	99	31	26,3	cyclictest	885	-21	mta-sts-daemon	12:25:14	0
486248	99	31	24,5	cyclictest	651510	-21	kworker/u8:0+flush-8:0	10:55:31	0
486257	99	30	24,4	cyclictest	562449	-21	apt-get	08:25:03	2
486253	99	30	26,3	cyclictest	540453	-21	kworker/u8:2+events_unbound	08:49:43	1
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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