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 Sun Feb 08, 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
554947	2	99	0,1	sleep7	554946	-21	rm	00:00:34	7
573138	2	98	0,1	sleep7	573137	-21	cut	00:06:27	7
473172	2	95	0,1	sleep6	0	-21	swapper/6	23:26:27	6
4087710	2	66	41,7	sleep5	0	-21	swapper/5	19:03:11	5
4087710	2	66	41,7	sleep5	0	-21	swapper/5	19:03:11	5
4088207	99	56	53,2	cyclictest	419428	-21	kworker/u16:2+events_unbound	23:51:22	5
4088202	99	54	52,2	cyclictest	373165	-21	kworker/u16:3+events_unbound	22:51:22	4
4087626	2	54	20,29	sleep7	0	-21	swapper/7	19:02:01	7
4087626	2	54	20,29	sleep7	0	-21	swapper/7	19:02:01	7
4088216	99	51	46,4	cyclictest	4159529	-21	latency_hist	19:41:08	7
4088202	99	50	48,2	cyclictest	335278	-21	kworker/u16:1+events_unbound	22:36:21	4
4088207	99	48	45,2	cyclictest	419428	-21	kworker/u16:2+events_unbound	23:06:09	5
4088202	99	48	46,2	cyclictest	506705	-21	kworker/u16:4+events_unbound	00:16:25	4
4088216	99	47	42,4	cyclictest	397376	-21	latency_hist	22:56:07	7
4088202	99	44	42,2	cyclictest	80542	-21	kworker/u16:3+events_unbound	20:56:37	4
4088202	99	44	41,2	cyclictest	142408	-21	kworker/u16:2+flush-8:0	22:06:20	4
4088207	99	43	41,2	cyclictest	506705	-21	kworker/u16:4+events_unbound	00:15:14	5
4088207	99	43	41,2	cyclictest	348644	-21	kworker/u16:0+events_unbound	23:31:43	5
4088202	99	43	41,2	cyclictest	419428	-21	kworker/u16:2+events_unbound	23:06:33	4
4087874	2	43	33,7	sleep6	0	-21	swapper/6	19:05:29	6
4087874	2	43	33,7	sleep6	0	-21	swapper/6	19:05:29	6
4088207	99	41	39,2	cyclictest	167126	-21	kworker/u16:3+flush-8:0	22:16:34	5
4088202	99	41	39,2	cyclictest	506705	-21	kworker/u16:4+events_unbound	23:41:37	4
4088202	99	41	39,2	cyclictest	506705	-21	kworker/u16:4+events_unbound	23:41:37	4
4088202	99	41	39,2	cyclictest	419428	-21	kworker/u16:2+events_unbound	23:16:42	4
4088207	99	40	38,2	cyclictest	321546	-21	kworker/u16:5+events_unbound	22:38:14	5
4088207	99	40	38,2	cyclictest	101330	-21	kworker/u16:1+events_unbound	21:55:42	5
4088211	99	39	36,2	cyclictest	348644	-21	kworker/u16:0+flush-8:0	22:36:33	6
4088207	99	39	37,2	cyclictest	378750	-21	kworker/u16:4+flush-8:0	22:53:57	5
4088202	99	39	37,2	cyclictest	378750	-21	kworker/u16:4+flush-8:0	22:56:37	4
4088207	99	38	36,2	cyclictest	419428	-21	kworker/u16:2+events_unbound	23:29:30	5
4088207	99	38	36,2	cyclictest	167126	-21	kworker/u16:3+events_unbound	22:09:42	5
4088207	99	38	35,2	cyclictest	167126	-21	kworker/u16:3+flush-8:0	22:01:25	5
4088202	99	38	35,2	cyclictest	348644	-21	kworker/u16:0+events_unbound	23:21:53	4
4088211	99	37	34,2	cyclictest	543535	-21	kworker/u16:1+flush-8:0	00:06:33	6
4088207	99	37	35,2	cyclictest	543535	-21	kworker/u16:1+events_unbound	00:31:29	5
4088207	99	37	35,2	cyclictest	373165	-21	kworker/u16:3+flush-8:0	22:56:42	5
4088207	99	37	35,2	cyclictest	348644	-21	kworker/u16:0+flush-8:0	23:50:57	5
4088207	99	37	35,2	cyclictest	348644	-21	kworker/u16:0+flush-8:0	23:50:57	5
4088207	99	37	35,2	cyclictest	335278	-21	kworker/u16:1+events_unbound	22:35:38	5
4088202	99	37	35,2	cyclictest	167126	-21	kworker/u16:3+flush-8:0	22:01:13	4
4088216	99	36	34,1	cyclictest	0	-21	swapper/7	19:26:08	7
4088207	99	36	34,2	cyclictest	543535	-21	kworker/u16:1+events_unbound	00:24:27	5
4088207	99	36	34,2	cyclictest	506705	-21	kworker/u16:4+events_unbound	00:06:31	5
4087920	2	36	25,8	sleep4	0	-21	swapper/4	19:06:07	4
4087920	2	36	25,8	sleep4	0	-21	swapper/4	19:06:07	4
4088216	99	35	30,4	cyclictest	650	-21	systemd-journal	00:14:30	7
4088207	99	35	33,2	cyclictest	321546	-21	kworker/u16:5+events_unbound	22:22:01	5
4088207	99	35	33,2	cyclictest	321546	-21	kworker/u16:5+events_unbound	22:22:01	5
4088207	99	35	33,2	cyclictest	101330	-21	kworker/u16:1+events_unbound	21:42:46	5
4088207	99	35	33,2	cyclictest	101330	-21	kworker/u16:1+events_unbound	21:42:46	5
4088207	99	35	33,2	cyclictest	101330	-21	kworker/u16:1+events_unbound	21:37:14	5
4088202	99	35	33,2	cyclictest	506705	-21	kworker/u16:4+flush-8:0	23:46:35	4
4088202	99	35	33,2	cyclictest	506705	-21	kworker/u16:4+flush-8:0	23:46:35	4
4088202	99	35	33,2	cyclictest	506705	-21	kworker/u16:4+events_unbound	23:56:42	4
4088202	99	35	33,2	cyclictest	101330	-21	kworker/u16:1+flush-8:0	21:56:37	4
4088202	99	35	32,2	cyclictest	312719	-21	kworker/u16:4+events_unbound	22:26:27	4
4088216	99	34	30,3	cyclictest	285225	-21	switchtime	22:06:37	7
4088216	99	34	28,5	cyclictest	4140226	-21	latency_hist	19:31:08	7
4088207	99	34	32,2	cyclictest	543578	-21	kworker/u16:3+events_unbound	23:56:58	5
4088207	99	34	32,2	cyclictest	470255	-21	kworker/u16:3+events_unbound	23:39:28	5
4088207	99	34	32,2	cyclictest	443526	-21	kworker/u16:1+flush-8:0	23:25:42	5
4088207	99	34	32,2	cyclictest	4188625	-21	kworker/u16:0+events_unbound	21:16:06	5
4088207	99	34	32,2	cyclictest	348644	-21	kworker/u16:0+events_unbound	23:19:11	5
4088207	99	34	32,2	cyclictest	101330	-21	kworker/u16:1+events_unbound	21:59:27	5
4088202	99	34	33,1	cyclictest	373165	-21	kworker/u16:3+events_unbound	23:04:49	4
4088202	99	34	32,2	cyclictest	142408	-21	kworker/u16:2+flush-8:0	22:16:29	4
4088207	99	33	31,2	cyclictest	543535	-21	kworker/u16:1+events_unbound	00:27:25	5
4088207	99	33	31,2	cyclictest	101330	-21	kworker/u16:1+events_unbound	21:10:06	5
4088202	99	33	31,2	cyclictest	577241	-21	kworker/u16:0+events_unbound	00:29:56	4
4088202	99	33	31,2	cyclictest	506705	-21	kworker/u16:4+events_unbound	00:13:54	4
4088202	99	33	31,2	cyclictest	470255	-21	kworker/u16:3+events_unbound	23:37:53	4
4088202	99	33	31,2	cyclictest	348644	-21	kworker/u16:0+flush-8:0	22:41:40	4
4088202	99	33	30,2	cyclictest	4188625	-21	kworker/u16:0+events_unbound	21:21:09	4
4088216	99	32	26,5	cyclictest	24062	-21	latency_hist	20:11:08	7
4088207	99	32	30,2	cyclictest	373165	-21	kworker/u16:3+flush-8:0	22:46:34	5
4088207	99	32	30,2	cyclictest	370122	-21	kworker/u16:2+events_unbound	22:42:23	5
4088207	99	32	30,2	cyclictest	348644	-21	kworker/u16:0+events_unbound	23:14:55	5
4088202	99	32	30,2	cyclictest	543535	-21	kworker/u16:1+flush-8:0	00:01:22	4
4088202	99	32	30,2	cyclictest	142408	-21	kworker/u16:2+flush-8:0	21:31:03	4
4088211	99	31	28,2	cyclictest	4058863	-21	kworker/u16:3+flush-8:0	19:16:26	6
4088207	99	31	29,2	cyclictest	506705	-21	kworker/u16:4+events_unbound	23:42:42	5
4088207	99	31	29,2	cyclictest	506705	-21	kworker/u16:4+events_unbound	23:42:42	5
4088207	99	31	29,2	cyclictest	419428	-21	kworker/u16:2+events_unbound	23:03:15	5
4088207	99	31	29,2	cyclictest	321546	-21	kworker/u16:5+events_unbound	22:30:45	5
4088207	99	31	29,2	cyclictest	167126	-21	kworker/u16:3+events_unbound	22:15:48	5
4088202	99	31	30,1	cyclictest	506705	-21	kworker/u16:4+events_unbound	00:22:07	4
4088202	99	31	29,2	cyclictest	312719	-21	kworker/u16:4+events_unbound	22:31:36	4
4088202	99	31	28,2	cyclictest	373165	-21	kworker/u16:3+events_unbound	23:11:20	4
4088216	99	30	0,28	cyclictest	101290	-21	latency_hist	20:51:08	7
4088207	99	30	28,2	cyclictest	543578	-21	kworker/u16:3+events_unbound	00:03:03	5
4088207	99	30	28,2	cyclictest	101330	-21	kworker/u16:1+flush-8:0	21:16:55	5
4088207	99	30	28,2	cyclictest	101330	-21	kworker/u16:1+events_unbound	21:47:51	5
4088202	99	30	28,2	cyclictest	348644	-21	kworker/u16:0+events_unbound	23:34:33	4
4088202	99	30	27,2	cyclictest	335278	-21	kworker/u16:1+events_unbound	22:46:13	4
4088202	99	30	26,2	cyclictest	4188625	-21	kworker/u16:0+events_unbound	21:11:09	4
4088207	99	29	27,2	cyclictest	506705	-21	kworker/u16:4+events_unbound	00:18:43	5
4088207	99	29	27,2	cyclictest	4188625	-21	kworker/u16:0+events_unbound	20:31:05	5
4088207	99	29	27,2	cyclictest	4188625	-21	kworker/u16:0+events_unbound	20:07:10	5
4088207	99	29	27,2	cyclictest	4075397	-21	kworker/u16:4+events_unbound	19:33:18	5
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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