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 22, 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
239909	2	98	0,1	sleep7	239911	-21	grep	07:10:38	7
217373	2	56	46,7	sleep5	0	-21	swapper/5	07:00:51	5
217964	99	46	44,2	cyclictest	3725696	-21	kworker/u16:2+events_unbound	08:00:24	4
217567	2	45	34,8	sleep4	0	-21	swapper/4	07:03:38	4
217618	2	43	32,7	sleep6	0	-21	swapper/6	07:04:21	6
217450	2	42	2,36	sleep7	0	-21	swapper/7	07:01:57	7
217977	99	40	38,2	cyclictest	740404	-21	kworker/u16:3+events_unbound	11:20:27	6
217978	99	38	32,5	cyclictest	680137	-21	latency_hist	10:40:10	7
217978	99	38	32,5	cyclictest	374456	-21	latency_hist	08:25:10	7
217978	99	38	32,5	cyclictest	374456	-21	latency_hist	08:25:10	7
217964	99	37	35,2	cyclictest	511616	-21	kworker/u16:3+flush-8:0	10:05:36	4
217978	99	36	30,5	cyclictest	650	-21	systemd-journal	11:35:09	7
217964	99	35	33,2	cyclictest	582395	-21	kworker/u16:0+events_unbound	10:10:23	4
217978	99	34	28,5	cyclictest	650	-21	systemd-journal	12:25:09	7
217977	99	34	31,3	cyclictest	836942	-21	kworker/u16:3+events_unbound	11:45:35	6
217964	99	34	32,2	cyclictest	403308	-21	kworker/u16:4+flush-8:0	09:30:05	4
217978	99	33	27,5	cyclictest	848897	-21	latency_hist	11:50:10	7
217977	99	33	31,2	cyclictest	642282	-21	kworker/u16:0+events_unbound	10:45:40	6
217977	99	33	31,2	cyclictest	499259	-21	kworker/u16:0+flush-8:0	09:45:27	6
217964	99	32	30,2	cyclictest	383178	-21	kworker/u16:1+flush-8:0	08:27:23	4
217964	99	31	29,2	cyclictest	3725696	-21	kworker/u16:2+events_unbound	08:05:34	4
217964	99	31	29,2	cyclictest	279335	-21	kworker/u16:3+events_unbound	07:50:33	4
217977	99	30	28,2	cyclictest	511616	-21	kworker/u16:3+flush-8:0	09:50:20	6
217973	99	30	28,2	cyclictest	307595	-21	kworker/u16:1+events_unbound	08:02:23	5
217964	99	30	28,2	cyclictest	764588	-21	kworker/u16:1+events_unbound	12:15:37	4
217964	99	30	28,2	cyclictest	317368	-21	kworker/u16:4+events_unbound	08:10:25	4
217973	99	29	27,2	cyclictest	704423	-21	kworker/u16:4+flush-8:0	11:30:42	5
217964	99	29	27,2	cyclictest	740404	-21	kworker/u16:3+events_unbound	11:25:22	4
217978	99	28	0,27	cyclictest	924	-21	NetworkManager	08:27:23	7
217978	99	28	0,27	cyclictest	653612	-21	sh	10:25:40	7
217977	99	28	25,3	cyclictest	725971	-21	kworker/u16:0+events_unbound	11:00:25	6
217977	99	28	25,3	cyclictest	725971	-21	kworker/u16:0+events_unbound	11:00:25	6
217973	99	28	27,1	cyclictest	511616	-21	kworker/u16:3+flush-8:0	10:10:10	5
217973	99	28	26,2	cyclictest	764588	-21	kworker/u16:1+flush-8:0	11:15:30	5
217973	99	28	26,2	cyclictest	317368	-21	kworker/u16:4+events_unbound	08:05:23	5
217964	99	28	26,2	cyclictest	836942	-21	kworker/u16:3+events_unbound	11:50:54	4
217964	99	28	26,2	cyclictest	403308	-21	kworker/u16:4+events_unbound	08:40:25	4
217964	99	28	26,2	cyclictest	279335	-21	kworker/u16:3+events_unbound	09:00:33	4
217973	99	27	25,2	cyclictest	764588	-21	kworker/u16:1+events_unbound	11:50:52	5
217973	99	27	25,2	cyclictest	355792	-21	kworker/u16:0+events_unbound	08:37:08	5
217978	99	26	21,4	cyclictest	860962	-21	latency_hist	11:55:10	7
217973	99	26	24,2	cyclictest	3725696	-21	kworker/u16:2+events_unbound	07:36:43	5
217973	99	26	24,2	cyclictest	3725696	-21	kworker/u16:2+events_unbound	07:36:43	5
217973	99	26	24,2	cyclictest	279335	-21	kworker/u16:3+events_unbound	09:02:07	5
217973	99	26	23,2	cyclictest	3725696	-21	kworker/u16:2+events_unbound	07:55:15	5
217964	99	26	24,2	cyclictest	738910	-21	kworker/u16:2+events_unbound	11:05:24	4
217964	99	26	24,2	cyclictest	656455	-21	kworker/u16:1+events_unbound	10:50:29	4
217964	99	26	24,2	cyclictest	511616	-21	kworker/u16:3+events_unbound	09:50:35	4
217964	99	26	24,2	cyclictest	403308	-21	kworker/u16:4+flush-8:0	09:45:40	4
217978	99	25	14,10	cyclictest	650	-21	systemd-journal	09:30:10	7
217977	99	25	23,2	cyclictest	642282	-21	kworker/u16:0+flush-8:0	10:40:25	6
217977	99	25	23,2	cyclictest	403308	-21	kworker/u16:4+flush-8:0	10:05:10	6
217973	99	25	23,2	cyclictest	582395	-21	kworker/u16:0+events_unbound	10:00:37	5
217973	99	25	23,2	cyclictest	403308	-21	kworker/u16:4+flush-8:0	10:10:35	5
217973	99	25	23,2	cyclictest	3725696	-21	kworker/u16:2+events_unbound	07:18:15	5
217973	99	25	23,2	cyclictest	3725696	-21	kworker/u16:2+events_unbound	07:12:48	5
217964	99	25	23,2	cyclictest	897140	-21	kworker/u16:0+flush-8:0	12:30:52	4
217964	99	25	23,2	cyclictest	642282	-21	kworker/u16:0+events_unbound	10:35:32	4
217964	99	25	23,2	cyclictest	511616	-21	kworker/u16:3+events_unbound	10:30:23	4
217964	99	25	23,2	cyclictest	403308	-21	kworker/u16:4+events_unbound	09:55:36	4
217964	99	25	23,2	cyclictest	279335	-21	kworker/u16:3+events_unbound	09:20:23	4
217978	99	24	19,4	cyclictest	921116	-21	latency_hist	12:20:09	7
217978	99	24	0,23	cyclictest	583780	-21	latency_hist	10:00:10	7
217973	99	24	22,2	cyclictest	3725696	-21	kworker/u16:2+events_unbound	07:49:09	5
217973	99	24	22,2	cyclictest	317368	-21	kworker/u16:4+events_unbound	08:17:37	5
217964	99	24	22,2	cyclictest	897140	-21	kworker/u16:0+flush-8:0	12:10:25	4
217964	99	24	22,2	cyclictest	764588	-21	kworker/u16:1+events_unbound	11:45:24	4
217978	99	23	22,0	cyclictest	0	-21	swapper/7	09:20:33	7
217978	99	23	0,16	cyclictest	1267	-21	snmpd	07:20:40	7
217973	99	23	21,2	cyclictest	836942	-21	kworker/u16:3+events_unbound	11:45:20	5
217973	99	23	21,2	cyclictest	656455	-21	kworker/u16:1+flush-8:0	10:40:34	5
217973	99	23	21,2	cyclictest	403308	-21	kworker/u16:4+events_unbound	09:45:50	5
217973	99	23	21,2	cyclictest	3725696	-21	kworker/u16:2+events_unbound	07:53:43	5
217973	99	23	21,2	cyclictest	279335	-21	kworker/u16:3+events_unbound	09:15:59	5
217964	99	23	21,2	cyclictest	740404	-21	kworker/u16:3+events_unbound	11:20:42	4
217964	99	23	21,2	cyclictest	704423	-21	kworker/u16:4+events_unbound	11:10:23	4
217964	99	23	21,2	cyclictest	279335	-21	kworker/u16:3+events_unbound	09:10:25	4
217964	99	23	20,2	cyclictest	403308	-21	kworker/u16:4+flush-8:0	09:15:15	4
217977	99	22	20,2	cyclictest	403308	-21	kworker/u16:4+flush-8:0	10:25:35	6
217977	99	22	20,2	cyclictest	216681	-21	kworker/u16:3+events_unbound	07:05:23	6
217973	99	22	20,2	cyclictest	836942	-21	kworker/u16:3+events_unbound	12:05:33	5
217973	99	22	20,2	cyclictest	764588	-21	kworker/u16:1+flush-8:0	12:25:47	5
217973	99	22	20,2	cyclictest	642282	-21	kworker/u16:0+events_unbound	10:30:33	5
217964	99	22	20,2	cyclictest	403308	-21	kworker/u16:4+events_unbound	08:45:24	4
217964	99	22	20,2	cyclictest	164525	-21	kworker/u16:1+flush-8:0	07:30:25	4
217977	99	21	19,2	cyclictest	383837	-21	kworker/u16:2+flush-8:0	08:35:26	6
217977	99	21	18,2	cyclictest	704423	-21	kworker/u16:4+events_unbound	11:40:38	6
217973	99	21	19,2	cyclictest	279335	-21	kworker/u16:3+events_unbound	08:20:33	5
217973	99	21	19,2	cyclictest	279335	-21	kworker/u16:3+events_unbound	08:20:33	5
217964	99	21	19,2	cyclictest	836942	-21	kworker/u16:3+events_unbound	12:05:39	4
217964	99	21	19,2	cyclictest	836942	-21	kworker/u16:3+events_unbound	11:56:48	4
217964	99	21	19,2	cyclictest	403308	-21	kworker/u16:4+flush-8:0	08:50:31	4
217964	99	21	19,2	cyclictest	403308	-21	kworker/u16:4+events_unbound	10:20:23	4
217964	99	21	19,2	cyclictest	403308	-21	kworker/u16:4+events_unbound	09:05:38	4
217964	99	21	19,2	cyclictest	403308	-21	kworker/u16:4+events_unbound	08:55:24	4
217964	99	21	19,2	cyclictest	279335	-21	kworker/u16:3+events_unbound	07:55:28	4
217964	99	21	19,2	cyclictest	199057	-21	kworker/u16:0+flush-8:0	07:25:33	4
217977	99	20	18,2	cyclictest	740404	-21	kworker/u16:3+events_unbound	11:25:32	6
217977	99	20	18,2	cyclictest	403308	-21	kworker/u16:4+flush-8:0	10:20:35	6
217977	99	20	18,2	cyclictest	383837	-21	kworker/u16:2+flush-8:0	08:27:49	6
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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