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 Nov 27, 2025 12:44:15)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
2601204	2	66	0,2	sleep3	586	-21	kworker/3:2+events	08:01:14	3
2547507	99	62	56,5	cyclictest	2772710	-21	kworker/u8:0+flush-8:0	11:01:28	1
2547507	99	57	51,4	cyclictest	2842948	-21	kworker/u8:1+events_unbound	12:31:23	1
2547507	99	56	49,5	cyclictest	2594638	-21	kworker/u8:0+flush-8:0	08:16:23	1
2547507	99	56	49,5	cyclictest	2594638	-21	kworker/u8:0+flush-8:0	08:16:23	1
2547507	99	56	45,8	cyclictest	2638411	-21	ntpq	08:36:18	1
2547507	99	55	50,4	cyclictest	2649436	-21	kworker/u8:1+events_unbound	09:06:17	1
2547507	99	54	49,3	cyclictest	2634051	-21	kworker/u8:3+flush-8:0	10:56:22	1
2547507	99	54	46,6	cyclictest	2634051	-21	kworker/u8:3+events_unbound	10:41:23	1
2547505	99	54	38,13	cyclictest	2599694	-21	apt-get	08:01:05	0
2547510	99	52	24,9	cyclictest	282	-21	systemd-journal	11:40:01	2
2547507	99	52	45,5	cyclictest	2649436	-21	kworker/u8:1+flush-8:0	10:21:23	1
2547505	99	52	35,14	cyclictest	2808474	-21	apt-get	11:31:07	0
2547507	99	51	43,5	cyclictest	2803446	-21	kworker/u8:3+flush-8:0	12:01:20	1
2547507	99	51	41,8	cyclictest	2817211	-21	ntpq	11:36:25	1
2547507	99	50	42,5	cyclictest	2852653	-21	latency_hist	12:15:01	1
2547507	99	50	39,8	cyclictest	2628494	-21	ntpq	08:26:20	1
2805274	2	49	0,4	chrt	37	1	rcuc/2	11:26:19	2
2547507	99	49	44,4	cyclictest	2649436	-21	kworker/u8:1+events_unbound	11:26:25	1
2547507	99	49	43,4	cyclictest	2649436	-21	kworker/u8:1+events_unbound	10:46:24	1
2769942	2	48	0,2	sleep2	37	1	rcuc/2	10:51:16	2
2547507	99	48	43,4	cyclictest	2733162	-21	kworker/u8:2+flush-8:0	10:31:12	1
2547507	99	48	41,5	cyclictest	2793320	-21	latency_hist	11:15:01	1
2547505	99	48	40,5	cyclictest	2668997	-21	latency_hist	09:10:01	0
2547507	99	47	43,3	cyclictest	1719994	-21	kworker/u8:4+flush-8:0	07:16:27	1
2547507	99	47	42,4	cyclictest	2733162	-21	kworker/u8:2+events_unbound	10:26:12	1
2547507	99	47	41,4	cyclictest	2817719	-21	kworker/u8:0+events_unbound	12:36:21	1
2547507	99	47	41,4	cyclictest	2649436	-21	kworker/u8:1+flush-8:0	09:01:26	1
2547507	99	47	40,5	cyclictest	2713748	-21	kworker/u8:0+events_unbound	09:56:25	1
2547507	99	47	40,5	cyclictest	2649436	-21	kworker/u8:1+flush-8:0	09:41:22	1
2547507	99	47	38,7	cyclictest	2673184	-21	ntpq	09:11:23	1
2547505	99	47	38,7	cyclictest	2702872	-21	ntpq	09:41:22	0
2547505	99	47	37,7	cyclictest	282	-21	systemd-journal	09:30:00	0
2547510	99	46	26,7	cyclictest	282	-21	systemd-journal	07:36:21	2
2547507	99	46	41,3	cyclictest	2634051	-21	kworker/u8:3+events_unbound	10:16:16	1
2547507	99	46	40,4	cyclictest	1110744	-21	kworker/u8:2+flush-8:0	07:36:25	1
2547505	99	46	37,7	cyclictest	2833140	-21	/usr/sbin/munin	11:56:22	0
2547505	99	46	34,9	cyclictest	2866545	-21	ntpq	12:26:19	0
2547507	99	45	41,3	cyclictest	2778202	-21	kworker/u8:2+flush-8:0	11:51:27	1
2547507	99	45	41,3	cyclictest	2644021	-21	kworker/u8:0+flush-8:0	08:51:18	1
2547507	99	45	40,4	cyclictest	2634051	-21	kworker/u8:3+flush-8:0	10:01:22	1
2547507	99	45	39,4	cyclictest	2547220	-21	kworker/u8:0+flush-8:0	07:41:26	1
2547507	99	45	35,7	cyclictest	2707815	-21	ntpq	09:46:23	1
2547505	99	45	37,6	cyclictest	2623500	-21	ntpq	08:21:19	0
2547507	99	44	38,4	cyclictest	2634051	-21	kworker/u8:3+flush-8:0	09:16:22	1
2547505	99	44	23,18	cyclictest	2838091	-21	/usr/sbin/munin	12:01:17	0
2547507	99	43	39,3	cyclictest	2649436	-21	kworker/u8:1+events_unbound	09:55:01	1
2547507	99	43	38,4	cyclictest	2569639	-21	kworker/u8:1+events_unbound	07:51:24	1
2547507	99	43	38,4	cyclictest	1110744	-21	kworker/u8:2+flush-8:0	07:21:23	1
2547507	99	43	38,3	cyclictest	2634051	-21	kworker/u8:3+flush-8:0	10:11:14	1
2547507	99	43	36,5	cyclictest	2634051	-21	kworker/u8:3+events_unbound	08:35:01	1
2547505	99	43	35,6	cyclictest	1110744	-21	kworker/u8:2+flush-8:0	08:31:27	0
2547510	99	42	33,7	cyclictest	282	-21	systemd-journal	12:40:00	2
2547507	99	42	38,3	cyclictest	2594638	-21	kworker/u8:0+events_unbound	08:11:11	1
2547507	99	42	38,3	cyclictest	2594638	-21	kworker/u8:0+events_unbound	08:11:11	1
2547507	99	42	37,4	cyclictest	1110744	-21	kworker/u8:2+events_unbound	07:46:25	1
2547507	99	42	34,6	cyclictest	2842948	-21	kworker/u8:1+flush-8:0	12:26:21	1
2547505	99	42	33,7	cyclictest	2728340	-21	apt-get	10:10:00	0
2547505	99	42	24,15	cyclictest	2712648	-21	ntpq	09:51:22	0
2547507	99	41	37,3	cyclictest	2817719	-21	kworker/u8:0+flush-8:0	12:16:29	1
2547507	99	41	35,4	cyclictest	2649436	-21	kworker/u8:1+events_unbound	11:06:21	1
2547507	99	41	33,6	cyclictest	1110744	-21	kworker/u8:2+flush-8:0	08:06:21	1
2547507	99	41	32,7	cyclictest	2772697	-21	ntpq	10:51:21	1
2547505	99	41	23,16	cyclictest	2832471	-21	unixbench_multi	11:51:28	0
2547507	99	40	34,5	cyclictest	2649436	-21	kworker/u8:1+flush-8:0	09:31:23	1
2547507	99	40	34,4	cyclictest	1110744	-21	kworker/u8:2+flush-8:0	07:26:16	1
2547507	99	39	34,4	cyclictest	2778202	-21	kworker/u8:2+flush-8:0	11:46:19	1
2547507	99	39	34,3	cyclictest	2733162	-21	kworker/u8:2+events_unbound	10:36:18	1
2547507	99	39	32,5	cyclictest	2648321	-21	ntpq	08:46:24	1
2547507	99	39	29,8	cyclictest	2802317	-21	ntpq	11:21:22	1
2547505	99	39	31,6	cyclictest	2818591	-21	diskstats	11:41:12	0
2547505	99	39	21,16	cyclictest	2599341	-21	cron	08:00:00	0
2547507	99	38	32,4	cyclictest	2842949	-21	kworker/u8:4+flush-8:0	12:06:20	1
2547507	99	38	31,5	cyclictest	2634051	-21	kworker/u8:3+flush-8:0	09:36:25	1
2547080	2	38	4,9	sleep1	0	-21	swapper/1	07:08:52	1
2547507	99	37	32,4	cyclictest	2634518	-21	kworker/u8:4+events_unbound	08:41:23	1
2547505	99	37	21,14	cyclictest	2654714	-21	tr	08:56:10	0
2547505	99	37	20,15	cyclictest	2744736	-21	irqrtprio	10:26:14	0
2547505	99	37	15,19	cyclictest	282	-21	systemd-journal	10:20:03	0
2547507	99	36	30,4	cyclictest	1110744	-21	kworker/u8:2+flush-8:0	07:31:20	1
2547505	99	36	27,7	cyclictest	2797370	-21	ntpq	11:16:22	0
2547505	99	36	21,13	cyclictest	2678922	-21	sendmail	09:20:00	0
2547505	99	36	18,16	cyclictest	2868294	-21	sort	12:31:15	0
2547505	99	36	18,16	cyclictest	2555544	-21	irqrtprio	07:16:15	0
2547505	99	36	15,19	cyclictest	2792475	-21	ntpq	11:11:21	0
2547505	99	36	12,7	cyclictest	2803171	-21	cron	11:25:00	0
2547510	99	35	26,7	cyclictest	282	-21	systemd-journal	07:35:00	2
2547507	99	35	29,4	cyclictest	1719994	-21	kworker/u8:4+events_unbound	07:11:24	1
2547507	99	35	29,4	cyclictest	1110744	-21	kworker/u8:2+events_unbound	08:01:21	1
2547507	99	35	27,6	cyclictest	2634051	-21	kworker/u8:3+flush-8:0	09:26:22	1
2547505	99	35	21,12	cyclictest	2683859	-21	munin-plugin-st	09:25:00	0
2547505	99	35	19,14	cyclictest	0	-21	swapper/0	07:45:00	0
2547505	99	35	19,14	cyclictest	0	-21	swapper/0	07:30:01	0
2547505	99	35	18,15	cyclictest	2625004	-21	fschecks_count	08:26:11	0
2547505	99	35	17,16	cyclictest	2650098	-21	sort	08:51:16	0
2547505	99	35	14,18	cyclictest	2784311	-21	sort	11:06:15	0
2547505	99	35	13,20	cyclictest	0	-21	swapper/0	10:42:01	0
2739054	2	34	0,6	sleep3	45	1	irq_work/3	10:21:07	3
2547507	99	34	29,4	cyclictest	2817719	-21	kworker/u8:0+flush-8:0	12:21:15	1
2547507	99	34	28,4	cyclictest	2803446	-21	kworker/u8:3+flush-8:0	11:31:22	1
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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