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 12:43:34)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
1792258	2	59	33,7	sleep5	0	-21	swapper/5	07:00:29	5
1801138	2	57	45,8	sleep6	0	-21	swapper/6	07:01:59	6
1801305	2	52	41,8	sleep4	0	-21	swapper/4	07:04:21	4
1801670	99	51	44,5	cyclictest	650	-21	systemd-journal	09:40:18	7
1801664	99	48	44,3	cyclictest	2297225	-21	kworker/u16:0+flush-8:0	11:00:18	5
1801664	99	43	39,3	cyclictest	2140989	-21	kworker/u16:0+flush-8:0	10:30:18	5
1801072	2	40	3,31	sleep7	0	-21	swapper/7	07:01:03	7
1801670	99	37	31,5	cyclictest	1986826	-21	latency_hist	08:40:18	7
1801665	99	37	35,2	cyclictest	1939169	-21	kworker/u16:4+events_unbound	09:35:31	6
1801670	99	36	31,4	cyclictest	1900845	-21	latency_hist	07:55:18	7
1801665	99	36	34,2	cyclictest	1853116	-21	kworker/u16:1+events_unbound	08:15:43	6
1801670	99	35	30,4	cyclictest	2093021	-21	packagekitd	09:27:39	7
1801664	99	34	32,2	cyclictest	2371543	-21	kworker/u16:4+events_unbound	11:35:40	5
1801665	99	33	31,2	cyclictest	2479892	-21	kworker/u16:2+events_unbound	12:10:31	6
1801665	99	33	31,2	cyclictest	2297225	-21	kworker/u16:0+flush-8:0	11:00:43	6
1801665	99	33	31,2	cyclictest	2239352	-21	kworker/u16:1+events_unbound	10:40:31	6
1801665	99	33	31,2	cyclictest	2153872	-21	kworker/u16:2+flush-8:0	11:45:13	6
1801665	99	33	31,2	cyclictest	2093150	-21	kworker/u16:6+events_unbound	09:45:31	6
1801665	99	33	31,2	cyclictest	1853116	-21	kworker/u16:1+events_unbound	08:10:40	6
1801664	99	32	29,2	cyclictest	2093150	-21	kworker/u16:6+flush-8:0	09:27:44	5
1801656	99	32	30,2	cyclictest	1910105	-21	kworker/u16:2+events_unbound	08:00:18	4
1801665	99	31	29,2	cyclictest	2479892	-21	kworker/u16:2+events_unbound	12:25:42	6
1801670	99	30	25,4	cyclictest	650	-21	systemd-journal	09:20:19	7
1801665	99	30	28,2	cyclictest	2191222	-21	kworker/u16:4+flush-8:0	10:15:43	6
1801665	99	30	28,2	cyclictest	2191222	-21	kworker/u16:4+events_unbound	10:30:39	6
1801664	99	30	28,2	cyclictest	1996520	-21	kworker/u16:0+flush-8:0	09:20:48	5
1801664	99	29	26,2	cyclictest	2239352	-21	kworker/u16:1+flush-8:0	10:40:55	5
1801656	99	29	27,2	cyclictest	2479892	-21	kworker/u16:2+events_unbound	12:30:31	4
1801656	99	29	27,2	cyclictest	1910105	-21	kworker/u16:2+events_unbound	08:50:32	4
1801665	99	28	26,2	cyclictest	2466987	-21	kworker/u16:0+events_unbound	12:20:45	6
1801665	99	28	26,2	cyclictest	2140990	-21	kworker/u16:1+events_unbound	10:00:30	6
1801664	99	28	26,2	cyclictest	1910105	-21	kworker/u16:2+events_unbound	08:45:31	5
1801670	99	27	24,2	cyclictest	1852162	-21	ntp_states	07:25:44	7
1801670	99	27	0,26	cyclictest	2275260	-21	ssh	10:45:13	7
1801665	99	27	25,2	cyclictest	1939169	-21	kworker/u16:4+events_unbound	09:20:32	6
1801665	99	27	25,2	cyclictest	1910105	-21	kworker/u16:2+events_unbound	08:25:33	6
1801665	99	27	25,2	cyclictest	1811451	-21	kworker/u16:4+flush-8:0	07:30:13	6
1801664	99	27	23,3	cyclictest	2297225	-21	kworker/u16:0+flush-8:0	11:15:43	5
1801656	99	27	25,2	cyclictest	2466987	-21	kworker/u16:0+events_unbound	12:10:55	4
1801656	99	26	24,2	cyclictest	2153872	-21	kworker/u16:2+flush-8:0	10:05:52	4
1801656	99	26	24,2	cyclictest	2153872	-21	kworker/u16:2+flush-8:0	10:05:52	4
1801656	99	26	24,2	cyclictest	1853116	-21	kworker/u16:1+flush-8:0	08:15:41	4
1801656	99	26	21,4	cyclictest	2152275	-21	smart_sda	09:50:44	4
1801670	99	25	25,0	cyclictest	0	-21	swapper/7	11:15:38	7
1801670	99	25	24,0	cyclictest	0	-21	swapper/7	08:10:38	7
1801670	99	25	0,24	cyclictest	5747	-21	gnome-shell	11:05:28	7
1801665	99	25	23,2	cyclictest	2275695	-21	kworker/u16:3+events_unbound	10:49:52	6
1801665	99	25	23,2	cyclictest	2275695	-21	kworker/u16:3+events_unbound	10:49:52	6
1801665	99	25	23,2	cyclictest	2153872	-21	kworker/u16:2+events_unbound	09:55:33	6
1801665	99	25	23,2	cyclictest	2140989	-21	kworker/u16:0+events_unbound	10:20:41	6
1801665	99	25	23,2	cyclictest	1939169	-21	kworker/u16:4+flush-8:0	08:40:44	6
1801664	99	25	23,2	cyclictest	2153872	-21	kworker/u16:2+flush-8:0	10:35:41	5
1801664	99	25	22,3	cyclictest	2275695	-21	kworker/u16:3+flush-8:0	11:40:42	5
1801670	99	24	23,0	cyclictest	0	-21	swapper/7	07:45:35	7
1801665	99	24	22,2	cyclictest	2371543	-21	kworker/u16:4+events_unbound	11:35:34	6
1801665	99	24	22,2	cyclictest	2371543	-21	kworker/u16:4+events_unbound	11:32:19	6
1801665	99	24	22,2	cyclictest	2275695	-21	kworker/u16:3+events_unbound	10:56:31	6
1801665	99	24	22,2	cyclictest	2015290	-21	kworker/u16:1+events_unbound	08:55:37	6
1801665	99	24	22,2	cyclictest	1853116	-21	kworker/u16:1+events_unbound	07:35:43	6
1801665	99	24	22,2	cyclictest	1811451	-21	kworker/u16:4+events_unbound	07:30:42	6
1801665	99	24	21,2	cyclictest	2275695	-21	kworker/u16:3+events_unbound	11:20:33	6
1801664	99	24	21,2	cyclictest	2371543	-21	kworker/u16:4+flush-8:0	11:50:18	5
1801656	99	24	22,2	cyclictest	2297225	-21	kworker/u16:0+flush-8:0	11:00:56	4
1801665	99	23	21,2	cyclictest	2275695	-21	kworker/u16:3+events_unbound	12:34:43	6
1801665	99	23	21,2	cyclictest	2275695	-21	kworker/u16:3+events_unbound	11:26:25	6
1801665	99	23	21,2	cyclictest	2239352	-21	kworker/u16:1+flush-8:0	10:36:04	6
1801665	99	23	21,2	cyclictest	1939169	-21	kworker/u16:4+events_unbound	09:33:06	6
1801665	99	23	21,2	cyclictest	1939169	-21	kworker/u16:4+events_unbound	09:09:33	6
1801664	99	23	21,2	cyclictest	2153872	-21	kworker/u16:2+events_unbound	11:10:43	5
1801656	99	23	21,2	cyclictest	2371543	-21	kworker/u16:4+flush-8:0	11:35:42	4
1801656	99	23	21,2	cyclictest	2140989	-21	kworker/u16:0+flush-8:0	09:46:37	4
1801656	99	23	21,2	cyclictest	1910105	-21	kworker/u16:2+events_unbound	08:25:11	4
2415130	2	22	0,1	chrt	2415131	-21	kthreadcore	11:40:38	7
1801670	99	22	21,0	cyclictest	0	-21	swapper/7	11:50:36	7
1801670	99	22	21,0	cyclictest	0	-21	swapper/7	08:45:39	7
1801670	99	22	21,0	cyclictest	0	-21	swapper/7	07:30:33	7
1801670	99	22	17,4	cyclictest	2455706	-21	latency_hist	12:00:17	7
1801665	99	22	20,2	cyclictest	2191222	-21	kworker/u16:4+events_unbound	10:27:08	6
1801665	99	22	20,2	cyclictest	2153872	-21	kworker/u16:2+events_unbound	10:11:52	6
1801664	99	22	20,2	cyclictest	2297225	-21	kworker/u16:0+flush-8:0	11:20:50	5
1801664	99	22	20,2	cyclictest	1939169	-21	kworker/u16:4+flush-8:0	08:25:44	5
1801656	99	22	20,2	cyclictest	2275695	-21	kworker/u16:3+flush-8:0	11:55:41	4
1801656	99	22	20,2	cyclictest	2275695	-21	kworker/u16:3+flush-8:0	11:20:44	4
1801656	99	22	20,2	cyclictest	1939169	-21	kworker/u16:4+events_unbound	09:25:29	4
1801656	99	22	20,2	cyclictest	1772898	-21	kworker/u16:3+events_unbound	07:09:34	4
1801656	99	22	17,2	cyclictest	2371543	-21	kworker/u16:4+events_unbound	11:45:36	4
1801670	99	21	21,0	cyclictest	0	-21	swapper/7	10:35:46	7
1801670	99	21	19,1	cyclictest	2147504	-21	ssh	09:50:35	7
1801665	99	21	19,2	cyclictest	2153872	-21	kworker/u16:2+events_unbound	11:18:20	6
1801665	99	21	19,2	cyclictest	2140989	-21	kworker/u16:0+events_unbound	10:09:52	6
1801665	99	21	19,2	cyclictest	2140989	-21	kworker/u16:0+events_unbound	10:09:52	6
1801665	99	21	19,2	cyclictest	1811451	-21	kworker/u16:4+flush-8:0	07:50:47	6
1801665	99	21	19,2	cyclictest	1811451	-21	kworker/u16:4+events_unbound	07:47:44	6
1801665	99	21	15,2	cyclictest	2275695	-21	kworker/u16:3+events_unbound	10:52:40	6
1801664	99	21	19,2	cyclictest	2275695	-21	kworker/u16:3+events_unbound	11:30:45	5
1801664	99	21	17,3	cyclictest	2191655	-21	munin-node	10:10:29	5
1801656	99	21	19,2	cyclictest	2466987	-21	kworker/u16:0+events_unbound	12:15:46	4
1801656	99	21	19,2	cyclictest	2275695	-21	kworker/u16:3+events_unbound	11:51:10	4
1801656	99	21	19,2	cyclictest	2153872	-21	kworker/u16:2+events_unbound	10:40:35	4
1801656	99	21	19,2	cyclictest	1939169	-21	kworker/u16:4+flush-8:0	09:16:29	4
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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