OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of system in rack #0, slot #2

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.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Compare latency of primary with shadow system

Characteristics of the 100 highest latencies:

System rack0slot2.osadl.org (updated Fri Feb 20, 2026 00:43:34)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
3229208	2	58	48,7	sleep6	0	-21	swapper/6	19:01:52	6
3229759	99	48	45,2	cyclictest	3571674	-21	kworker/u16:3+flush-8:0	22:10:20	4
3229455	2	48	38,7	sleep5	0	-21	swapper/5	19:05:19	5
3229389	2	45	2,39	sleep7	0	-21	swapper/7	19:04:25	7
3229425	2	44	34,7	sleep4	0	-21	swapper/4	19:04:54	4
3229769	99	42	37,4	cyclictest	3547098	-21	latency_hist	21:40:20	7
3229769	99	38	36,1	cyclictest	3737554	-21	ssh	22:55:52	7
3229762	99	36	34,2	cyclictest	3571648	-21	kworker/u16:4+flush-8:0	22:10:38	6
3229769	99	35	32,2	cyclictest	3894511	-21	load	00:00:44	7
3229760	99	35	33,2	cyclictest	3789312	-21	kworker/u16:3+flush-8:0	00:25:46	5
3229760	99	35	32,2	cyclictest	3405642	-21	kworker/u16:3+events_unbound	21:20:35	5
3229762	99	34	32,2	cyclictest	3789312	-21	kworker/u16:3+events_unbound	23:25:46	6
3229760	99	33	31,2	cyclictest	3761595	-21	kworker/u16:4+flush-8:0	23:15:46	5
3229760	99	32	29,2	cyclictest	3453349	-21	kworker/u16:1+flush-8:0	21:25:35	5
3229759	99	32	31,1	cyclictest	3873320	-21	kworker/u16:0+events_unbound	00:10:37	4
3229762	99	31	29,2	cyclictest	3761595	-21	kworker/u16:4+flush-8:0	23:05:46	6
3229762	99	31	29,2	cyclictest	3571674	-21	kworker/u16:3+flush-8:0	22:00:44	6
3229762	99	30	28,2	cyclictest	3309741	-21	kworker/u16:0+flush-8:0	19:55:43	6
3229759	99	30	27,3	cyclictest	2509157	-21	kworker/u16:1+events_unbound	19:20:34	4
3229760	99	29	27,2	cyclictest	3571674	-21	kworker/u16:3+flush-8:0	22:10:47	5
3229759	99	29	28,1	cyclictest	3521319	-21	kworker/u16:3+events_unbound	21:34:12	4
3229769	99	28	27,0	cyclictest	0	-21	swapper/7	19:18:44	7
3229769	99	28	27,0	cyclictest	0	-21	swapper/7	19:12:51	7
3229762	99	28	26,2	cyclictest	3761595	-21	kworker/u16:4+events_unbound	23:15:34	6
3916358	2	27	0,0	chrt	3916361	-21	kthreadcore	00:10:43	7
3229769	99	27	25,1	cyclictest	3665550	-21	ssh	22:26:09	7
3229769	99	27	25,1	cyclictest	3665550	-21	ssh	22:26:09	7
3229760	99	27	25,2	cyclictest	3665381	-21	kworker/u16:5+events_unbound	22:40:43	5
3229769	99	26	25,0	cyclictest	0	-21	swapper/7	19:35:21	7
3229769	99	26	21,4	cyclictest	3885695	-21	latency_hist	00:00:20	7
3229762	99	26	24,2	cyclictest	3701820	-21	kworker/u16:1+flush-8:0	22:50:44	6
3229760	99	26	24,2	cyclictest	3789312	-21	kworker/u16:3+events_unbound	23:30:35	5
3229769	99	25	24,0	cyclictest	0	-21	swapper/7	20:10:36	7
3229762	99	25	23,2	cyclictest	3521319	-21	kworker/u16:3+events_unbound	21:30:41	6
3229769	99	24	23,0	cyclictest	0	-21	swapper/7	20:03:59	7
3229762	99	24	23,1	cyclictest	3701820	-21	kworker/u16:1+flush-8:0	22:55:50	6
3229762	99	24	22,2	cyclictest	3521319	-21	kworker/u16:3+events_unbound	21:35:38	6
3229762	99	24	22,2	cyclictest	1794985	-21	kworker/u16:5+flush-8:0	19:25:43	6
3229760	99	24	21,3	cyclictest	3656184	-21	kworker/u16:0+events_unbound	23:10:45	5
3229769	99	23	22,0	cyclictest	0	-21	swapper/7	22:21:12	7
3229769	99	23	22,0	cyclictest	0	-21	swapper/7	21:51:14	7
3229769	99	23	22,0	cyclictest	0	-21	swapper/7	20:57:00	7
3229769	99	23	22,0	cyclictest	0	-21	swapper/7	20:54:07	7
3229762	99	23	21,2	cyclictest	3788897	-21	kworker/u16:2+events_unbound	23:40:45	6
3229762	99	23	21,2	cyclictest	1794985	-21	kworker/u16:5+events_unbound	19:43:45	6
3229759	99	23	21,2	cyclictest	3405642	-21	kworker/u16:3+flush-8:0	20:35:45	4
3229759	99	23	21,2	cyclictest	2509157	-21	kworker/u16:1+events_unbound	19:30:44	4
3229769	99	22	21,0	cyclictest	0	-21	swapper/7	23:25:52	7
3229769	99	22	20,1	cyclictest	3909297	-21	ssh	00:09:08	7
3229769	99	22	0,21	cyclictest	3776817	-21	latency_hist	23:15:20	7
3229762	99	22	20,2	cyclictest	3789312	-21	kworker/u16:3+flush-8:0	23:35:35	6
3229762	99	22	20,2	cyclictest	3788897	-21	kworker/u16:2+events_unbound	23:30:33	6
3229762	99	22	20,2	cyclictest	3701820	-21	kworker/u16:1+flush-8:0	22:50:15	6
3229762	99	22	20,2	cyclictest	3665381	-21	kworker/u16:5+events_unbound	22:35:42	6
3229762	99	22	20,2	cyclictest	1794985	-21	kworker/u16:5+flush-8:0	19:10:45	6
3229760	99	22	20,2	cyclictest	3788897	-21	kworker/u16:2+events_unbound	23:40:49	5
3229760	99	22	20,2	cyclictest	3453349	-21	kworker/u16:1+flush-8:0	21:30:46	5
3229759	99	22	20,2	cyclictest	3559175	-21	kworker/u16:0+flush-8:0	21:45:45	4
3229759	99	22	20,2	cyclictest	3559175	-21	kworker/u16:0+flush-8:0	21:45:45	4
3229759	99	22	20,2	cyclictest	3405642	-21	kworker/u16:3+events_unbound	21:00:43	4
3229762	99	21	19,2	cyclictest	3873996	-21	kworker/u16:1+flush-8:0	00:00:14	6
3229762	99	21	19,2	cyclictest	3571648	-21	kworker/u16:4+flush-8:0	22:05:47	6
3229762	99	21	19,2	cyclictest	3367396	-21	kworker/u16:2+flush-8:0	21:15:38	6
3229762	99	21	19,2	cyclictest	3336359	-21	kworker/u16:3+flush-8:0	20:00:36	6
3229762	99	21	19,2	cyclictest	3309741	-21	kworker/u16:0+flush-8:0	20:15:41	6
3229762	99	21	19,2	cyclictest	3309741	-21	kworker/u16:0+events_unbound	20:20:32	6
3229760	99	21	18,2	cyclictest	3405642	-21	kworker/u16:3+flush-8:0	21:05:45	5
3229760	99	21	18,2	cyclictest	3405642	-21	kworker/u16:3+flush-8:0	21:05:45	5
3229759	99	21	19,2	cyclictest	3788897	-21	kworker/u16:2+events_unbound	23:25:36	4
3871152	2	20	0,1	chrt	3871150	-21	ssh	23:50:55	7
3871152	2	20	0,1	chrt	3871150	-21	ssh	23:50:55	7
3229769	99	20	20,0	cyclictest	0	-21	swapper/7	23:35:42	7
3229762	99	20	18,2	cyclictest	3913414	-21	kworker/u16:4+events_unbound	00:20:15	6
3229762	99	20	18,2	cyclictest	3405642	-21	kworker/u16:3+flush-8:0	21:00:43	6
3229762	99	20	18,2	cyclictest	3367396	-21	kworker/u16:2+events_unbound	20:30:47	6
3229762	99	20	18,2	cyclictest	2509157	-21	kworker/u16:1+events_unbound	20:40:43	6
3229760	99	20	18,2	cyclictest	3665381	-21	kworker/u16:5+flush-8:0	22:35:41	5
3229759	99	20	18,2	cyclictest	3571674	-21	kworker/u16:3+flush-8:0	22:25:34	4
3229759	99	20	18,2	cyclictest	3571674	-21	kworker/u16:3+flush-8:0	22:25:34	4
3229759	99	20	18,2	cyclictest	2509157	-21	kworker/u16:1+events_unbound	20:45:36	4
3229769	99	19	18,0	cyclictest	0	-21	swapper/7	19:48:01	7
3229762	99	19	17,2	cyclictest	3761595	-21	kworker/u16:4+flush-8:0	23:10:40	6
3229762	99	19	17,2	cyclictest	3433897	-21	kworker/u16:0+events_unbound	21:05:34	6
3229762	99	19	17,2	cyclictest	3433897	-21	kworker/u16:0+events_unbound	21:05:34	6
3229762	99	19	17,2	cyclictest	3367396	-21	kworker/u16:2+events_unbound	21:10:35	6
3229762	99	19	17,2	cyclictest	1794985	-21	kworker/u16:5+events_unbound	19:31:01	6
3229762	99	19	15,3	cyclictest	3571674	-21	kworker/u16:3+events_unbound	22:20:39	6
3229759	99	19	16,2	cyclictest	3571674	-21	kworker/u16:3+flush-8:0	22:10:25	4
3229769	99	18	9,8	cyclictest	0	-21	swapper/7	23:15:40	7
3229769	99	18	18,0	cyclictest	0	-21	swapper/7	20:38:52	7
3229762	99	18	16,2	cyclictest	3656184	-21	kworker/u16:0+flush-8:0	22:41:15	6
3229762	99	18	16,2	cyclictest	3405642	-21	kworker/u16:3+events_unbound	20:50:49	6
3229760	99	18	16,2	cyclictest	1794985	-21	kworker/u16:5+flush-8:0	19:40:46	5
3229759	99	18	16,2	cyclictest	3788897	-21	kworker/u16:2+events_unbound	23:40:35	4
3229769	99	17	9,7	cyclictest	0	-21	swapper/7	22:40:48	7
3229769	99	17	8,8	cyclictest	0	-21	swapper/7	22:00:43	7
3229769	99	17	8,8	cyclictest	0	-21	swapper/7	21:05:46	7
3229769	99	17	8,8	cyclictest	0	-21	swapper/7	21:05:46	7
3229769	99	17	16,0	cyclictest	0	-21	swapper/7	19:41:06	7
3229769	99	17	16,0	cyclictest	0	-21	swapper/7	19:23:14	7
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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