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 Jul 20, 2026 12:44:14)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
2597883	2	279	0,3	sleep3	584	-21	kworker/3:2-events	08:37:28	3
2773823	2	165	0,3	sleep3	584	-21	kworker/3:2-events	11:32:30	3
2510557	99	60	52,5	cyclictest	2750544	-21	cp	11:10:00	1
2510553	99	59	54,3	cyclictest	2458827	-21	kworker/u8:3+flush-8:0	07:20:00	0
2510553	99	59	50,7	cyclictest	2720805	-21	latency_hist	10:40:02	0
2510561	99	58	53,3	cyclictest	2780260	-21	kworker/u8:1+events_unbound	12:15:01	2
2510557	99	58	49,6	cyclictest	2740583	-21	latency_hist	11:00:01	1
2510557	99	57	49,6	cyclictest	2780260	-21	kworker/u8:1+flush-8:0	12:02:40	1
2510553	99	57	49,6	cyclictest	2839767	-21	latency_hist	12:40:01	0
2510557	99	56	51,4	cyclictest	2705943	-21	kworker/u8:3+events_unbound	11:17:41	1
2510557	99	56	46,7	cyclictest	2690834	-21	apt-get	10:10:00	1
2510557	99	56	42,10	cyclictest	281	-21	systemd-journal	08:47:25	1
2510553	99	56	48,5	cyclictest	2561931	-21	latency_hist	08:00:01	0
2510557	99	55	46,6	cyclictest	2675999	-21	latency_hist	09:55:01	1
2510557	99	55	45,7	cyclictest	281	-21	systemd-journal	11:30:01	1
2510553	99	55	47,5	cyclictest	2556998	-21	latency_hist	07:55:01	0
2510561	99	54	48,4	cyclictest	2566906	-21	kworker/u8:1+events_unbound	08:12:23	2
2588265	2	53	0,2	sleep3	584	-21	kworker/3:2+mm_percpu_wq	08:27:29	3
2510553	99	53	43,7	cyclictest	2656236	-21	latency_hist	09:35:01	0
2510561	99	52	46,4	cyclictest	2735844	-21	kworker/u8:0+events_unbound	11:32:28	2
2510557	99	52	47,3	cyclictest	2490843	-21	kworker/u8:2+flush-8:0	07:47:34	1
2510561	99	51	47,3	cyclictest	2566906	-21	kworker/u8:1+flush-8:0	08:07:40	2
2510557	99	51	46,3	cyclictest	2780260	-21	kworker/u8:1+flush-8:0	12:17:26	1
2673263	2	49	0,6	chrt	0	-21	swapper/2	09:52:30	2
2510557	99	49	43,4	cyclictest	2631747	-21	kworker/u8:2+flush-8:0	09:17:41	1
2510557	99	47	40,4	cyclictest	2735844	-21	kworker/u8:0+flush-8:0	11:57:41	1
2510553	99	47	39,6	cyclictest	2706329	-21	/usr/sbin/munin	10:27:38	0
2510557	99	46	40,4	cyclictest	2626759	-21	kworker/u8:1+flush-8:0	09:07:26	1
2510557	99	46	40,4	cyclictest	2566906	-21	kworker/u8:1+flush-8:0	08:12:38	1
2510557	99	46	38,6	cyclictest	2626759	-21	kworker/u8:1+flush-8:0	10:02:23	1
2510557	99	46	34,9	cyclictest	2546433	-21	ntpq	07:42:35	1
2510561	99	45	39,4	cyclictest	2735844	-21	kworker/u8:0+events_unbound	11:50:09	2
2510557	99	45	39,4	cyclictest	2735844	-21	kworker/u8:0+flush-8:0	12:22:39	1
2510561	99	44	39,4	cyclictest	2705943	-21	kworker/u8:3+events_unbound	11:22:45	2
2510557	99	44	36,5	cyclictest	2621347	-21	kworker/u8:3+flush-8:0	09:02:34	1
2510561	99	43	39,3	cyclictest	2576591	-21	kworker/u8:2+events_unbound	08:47:39	2
2510561	99	43	38,4	cyclictest	2780260	-21	kworker/u8:1+events_unbound	12:15:04	2
2510561	99	43	38,4	cyclictest	2705943	-21	kworker/u8:3+events_unbound	11:27:39	2
2510557	99	43	38,4	cyclictest	2458827	-21	kworker/u8:3+flush-8:0	07:12:39	1
2510557	99	43	38,4	cyclictest	2458827	-21	kworker/u8:3+flush-8:0	07:12:39	1
2510557	99	43	36,5	cyclictest	2686167	-21	kworker/u8:2+flush-8:0	10:42:34	1
2510561	99	42	39,2	cyclictest	2656048	-21	kworker/u8:0+events_unbound	10:17:27	2
2510561	99	42	37,4	cyclictest	2830209	-21	kworker/u8:2+flush-8:0	12:37:42	2
2510561	99	42	37,4	cyclictest	2542439	-21	kworker/u8:0+events_unbound	08:52:34	2
2510557	99	42	37,3	cyclictest	2705943	-21	kworker/u8:3+flush-8:0	10:47:30	1
2510557	99	41	36,4	cyclictest	2705943	-21	kworker/u8:3+flush-8:0	12:27:38	1
2510557	99	41	36,4	cyclictest	2705943	-21	kworker/u8:3+flush-8:0	12:27:38	1
2510557	99	41	34,5	cyclictest	2755077	-21	kworker/u8:2+flush-8:0	11:37:37	1
2510553	99	41	32,6	cyclictest	2750451	-21	apt-get	11:10:00	0
2510561	99	40	35,3	cyclictest	2705943	-21	kworker/u8:3+events_unbound	11:12:39	2
2510557	99	40	35,4	cyclictest	2500611	-21	kworker/u8:1+flush-8:0	07:17:25	1
2510557	99	40	34,4	cyclictest	2711316	-21	apt-get	10:32:22	1
2510561	99	39	35,3	cyclictest	2490843	-21	kworker/u8:2+events_unbound	07:37:42	2
2510561	99	39	33,4	cyclictest	2705943	-21	kworker/u8:3+events_unbound	12:32:09	2
2510553	99	39	30,6	cyclictest	2755664	-21	latency_hist	11:15:00	0
2510553	99	39	28,9	cyclictest	2739794	-21	ntpq	10:57:33	0
2510553	99	38	29,6	cyclictest	281	-21	systemd-journal	08:37:23	0
2510553	99	37	12,23	cyclictest	2810167	-21	kworker/0:0+events	12:17:35	0
2510561	99	36	31,4	cyclictest	2626759	-21	kworker/u8:1+flush-8:0	09:22:42	2
2510557	99	36	30,4	cyclictest	2641142	-21	kworker/u8:3+flush-8:0	09:57:41	1
2510557	99	36	29,5	cyclictest	2705943	-21	kworker/u8:3+events_unbound	10:37:30	1
2510557	99	36	29,5	cyclictest	2626759	-21	kworker/u8:1+flush-8:0	10:22:37	1
2510557	99	36	29,5	cyclictest	2626759	-21	kworker/u8:1+flush-8:0	10:22:37	1
2510557	99	36	28,6	cyclictest	2522740	-21	/usr/sbin/munin	07:22:40	1
2510557	99	36	26,8	cyclictest	2744816	-21	ntpq	11:02:36	1
2510553	99	36	3,32	cyclictest	2760968	-21	kworker/0:3+events	11:44:11	0
2510553	99	36	2,32	cyclictest	2701025	-21	kworker/0:2+events	10:32:37	0
2510561	99	35	29,4	cyclictest	2735844	-21	kworker/u8:0+events_unbound	12:05:05	2
2510557	99	35	30,3	cyclictest	2542439	-21	kworker/u8:0+flush-8:0	08:27:24	1
2510557	99	35	28,5	cyclictest	2735600	-21	latency_hist	10:55:01	1
2510557	99	35	28,5	cyclictest	2705943	-21	kworker/u8:3+events_unbound	12:32:24	1
2510557	99	35	28,5	cyclictest	2631747	-21	kworker/u8:2+events_unbound	09:12:37	1
2510557	99	35	24,8	cyclictest	2605982	-21	ntpq	08:42:35	1
2510553	99	35	29,4	cyclictest	2621347	-21	kworker/u8:3+events_unbound	09:02:30	0
2505871	2	35	25,4	sleep0	0	-21	swapper/0	07:06:45	0
2510557	99	34	30,3	cyclictest	2542439	-21	kworker/u8:0+events_unbound	08:52:36	1
2510557	99	34	29,3	cyclictest	2576591	-21	kworker/u8:2+events_unbound	08:17:39	1
2510557	99	34	29,3	cyclictest	2576591	-21	kworker/u8:2+events_unbound	08:17:39	1
2510557	99	34	29,3	cyclictest	2542439	-21	kworker/u8:0+flush-8:0	07:52:32	1
2510557	99	34	28,4	cyclictest	2626759	-21	kworker/u8:1+flush-8:0	10:12:30	1
2510557	99	34	27,5	cyclictest	2542439	-21	kworker/u8:0+flush-8:0	07:57:35	1
2510557	99	34	27,5	cyclictest	2490843	-21	kworker/u8:2+events_unbound	07:27:35	1
2510553	99	34	2,30	cyclictest	2701025	-21	kworker/0:2+events	10:52:35	0
2510553	99	34	2,30	cyclictest	2490847	-21	kworker/0:1+events	07:42:23	0
2510553	99	34	1,31	cyclictest	2656275	-21	kworker/0:0+events	10:00:35	0
2510553	99	34	1,31	cyclictest	2490847	-21	kworker/0:1+events	07:47:31	0
2510561	99	33	27,4	cyclictest	2705943	-21	kworker/u8:3+events_unbound	11:05:01	2
2510557	99	33	28,4	cyclictest	2656048	-21	kworker/u8:0+flush-8:0	09:47:31	1
2510557	99	33	26,5	cyclictest	2656048	-21	kworker/u8:0+flush-8:0	09:37:33	1
2510553	99	33	27,4	cyclictest	2780260	-21	kworker/u8:1+flush-8:0	12:12:30	0
2510553	99	33	2,30	cyclictest	2490847	-21	kworker/0:1+events	08:29:51	0
2510553	99	33	1,31	cyclictest	2760968	-21	kworker/0:3+events	11:28:07	0
2510561	99	32	27,3	cyclictest	2542439	-21	kworker/u8:0+events_unbound	08:00:01	2
2510557	99	32	28,3	cyclictest	2705943	-21	kworker/u8:3+flush-8:0	11:42:39	1
2510557	99	32	27,4	cyclictest	2458827	-21	kworker/u8:3+flush-8:0	08:30:31	1
2510557	99	32	26,4	cyclictest	2567319	-21	apt-get	08:07:20	1
2510557	99	32	24,6	cyclictest	2542439	-21	kworker/u8:0+flush-8:0	08:22:36	1
2510557	99	32	22,8	cyclictest	2655456	-21	ntpq	09:32:33	1
2510553	99	32	8,22	cyclictest	2701025	-21	kworker/0:2+events	10:47:35	0
2510553	99	32	3,27	cyclictest	2490847	-21	kworker/0:1+events	07:37:35	0
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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