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 Aug 16, 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
1254304	2	95	0,1	sleep7	1254305	-21	ssh	11:32:16	7
662512	2	55	20,30	sleep7	0	-21	swapper/7	07:05:48	7
662643	2	51	41,7	sleep4	0	-21	swapper/4	07:07:38	4
662955	99	47	0,45	cyclictest	1340190	-21	latency_hist	12:07:50	7
662615	2	47	36,7	sleep5	0	-21	swapper/5	07:07:15	5
662955	99	46	40,5	cyclictest	1168943	-21	latency_hist	10:57:49	7
662946	99	45	42,2	cyclictest	1288892	-21	kworker/u16:4+events_unbound	11:48:22	5
662942	99	40	37,2	cyclictest	773799	-21	kworker/u16:3+flush-8:0	09:07:50	4
662942	99	40	37,2	cyclictest	773799	-21	kworker/u16:3+flush-8:0	09:07:50	4
662955	99	38	33,4	cyclictest	973318	-21	latency_hist	09:37:49	7
662951	99	37	34,2	cyclictest	1120453	-21	kworker/u16:2+flush-8:0	10:42:52	6
662946	99	37	35,2	cyclictest	1303535	-21	kworker/u16:0+events_unbound	12:19:21	5
662946	99	37	35,2	cyclictest	1303535	-21	kworker/u16:0+events_unbound	12:19:21	5
662946	99	37	34,2	cyclictest	830896	-21	kworker/u16:2+flush-8:0	09:17:52	5
662951	99	36	33,2	cyclictest	598673	-21	kworker/u16:3+flush-8:0	07:17:50	6
662946	99	36	34,2	cyclictest	1057149	-21	kworker/u16:1+events_unbound	10:21:26	5
662946	99	36	34,2	cyclictest	1023586	-21	kworker/u16:3+events_unbound	10:36:37	5
662951	99	35	33,2	cyclictest	1023586	-21	kworker/u16:3+flush-8:0	10:34:52	6
662946	99	35	33,2	cyclictest	1303535	-21	kworker/u16:0+flush-8:0	12:26:29	5
662946	99	35	33,2	cyclictest	1229246	-21	kworker/u16:1+events_unbound	11:26:17	5
662946	99	35	33,2	cyclictest	1057149	-21	kworker/u16:1+flush-8:0	10:09:36	5
662946	99	35	33,2	cyclictest	1023586	-21	kworker/u16:3+flush-8:0	10:32:17	5
662946	99	35	33,2	cyclictest	1023586	-21	kworker/u16:3+flush-8:0	10:16:27	5
662951	99	34	32,2	cyclictest	900250	-21	kworker/u16:0+flush-8:0	09:41:17	6
662951	99	34	32,2	cyclictest	764312	-21	kworker/u16:1+events_unbound	09:45:46	6
662951	99	34	32,2	cyclictest	764312	-21	kworker/u16:1+events_unbound	09:45:46	6
662951	99	34	32,2	cyclictest	1303535	-21	kworker/u16:0+events_unbound	12:36:48	6
662951	99	34	32,2	cyclictest	1288892	-21	kworker/u16:4+events_unbound	12:00:04	6
662951	99	34	32,2	cyclictest	1057149	-21	kworker/u16:1+flush-8:0	10:23:57	6
662951	99	34	32,2	cyclictest	1057149	-21	kworker/u16:1+events_unbound	10:29:17	6
662946	99	34	32,2	cyclictest	764312	-21	kworker/u16:1+flush-8:0	09:52:13	5
662946	99	34	32,2	cyclictest	1303535	-21	kworker/u16:0+events_unbound	11:56:09	5
662946	99	34	32,2	cyclictest	1265039	-21	kworker/u16:2+flush-8:0	11:44:20	5
662946	99	34	32,2	cyclictest	1265039	-21	kworker/u16:2+flush-8:0	11:36:49	5
662946	99	34	32,2	cyclictest	1142850	-21	kworker/u16:3+events_unbound	10:59:29	5
662942	99	34	31,2	cyclictest	830896	-21	kworker/u16:2+flush-8:0	09:32:50	4
662951	99	33	31,2	cyclictest	900250	-21	kworker/u16:0+flush-8:0	09:58:33	6
662951	99	33	31,2	cyclictest	830896	-21	kworker/u16:2+flush-8:0	09:25:33	6
662951	99	33	31,2	cyclictest	1155350	-21	kworker/u16:2+flush-8:0	11:02:29	6
662951	99	33	31,2	cyclictest	1155350	-21	kworker/u16:2+flush-8:0	10:56:12	6
662951	99	33	31,2	cyclictest	1142850	-21	kworker/u16:3+events_unbound	11:25:56	6
662951	99	33	31,2	cyclictest	1023586	-21	kworker/u16:3+flush-8:0	10:21:13	6
662946	99	33	31,2	cyclictest	764312	-21	kworker/u16:1+flush-8:0	09:41:25	5
662946	99	33	31,2	cyclictest	598673	-21	kworker/u16:3+events_unbound	07:21:54	5
662946	99	33	31,2	cyclictest	1303535	-21	kworker/u16:0+flush-8:0	12:33:49	5
662946	99	33	31,2	cyclictest	1288892	-21	kworker/u16:4+events_unbound	12:31:32	5
662946	99	33	31,2	cyclictest	1180377	-21	kworker/u16:0+flush-8:0	11:04:32	5
662946	99	33	31,2	cyclictest	1155350	-21	kworker/u16:2+flush-8:0	11:11:01	5
662951	99	32	30,2	cyclictest	764312	-21	kworker/u16:1+events_unbound	09:09:25	6
662951	99	32	30,2	cyclictest	1376878	-21	kworker/u16:2+flush-8:0	12:27:20	6
662951	99	32	30,2	cyclictest	1265039	-21	kworker/u16:2+flush-8:0	11:37:41	6
662951	99	32	30,2	cyclictest	1142850	-21	kworker/u16:3+flush-8:0	11:14:36	6
662951	99	32	30,2	cyclictest	1057149	-21	kworker/u16:1+flush-8:0	10:13:41	6
662946	99	32	30,2	cyclictest	764312	-21	kworker/u16:1+flush-8:0	09:10:52	5
662946	99	32	30,2	cyclictest	1303535	-21	kworker/u16:0+events_unbound	12:14:49	5
662946	99	32	30,2	cyclictest	1303535	-21	kworker/u16:0+events_unbound	12:00:25	5
662946	99	32	30,2	cyclictest	1265039	-21	kworker/u16:2+events_unbound	12:10:08	5
662946	99	32	30,2	cyclictest	1229246	-21	kworker/u16:1+flush-8:0	11:32:28	5
662946	99	32	30,2	cyclictest	1142850	-21	kworker/u16:3+flush-8:0	11:14:28	5
662946	99	32	30,2	cyclictest	1057149	-21	kworker/u16:1+flush-8:0	10:46:29	5
662946	99	32	30,2	cyclictest	1023586	-21	kworker/u16:3+flush-8:0	10:06:12	5
662951	99	31	29,2	cyclictest	764312	-21	kworker/u16:1+flush-8:0	09:34:05	6
662951	99	31	29,2	cyclictest	1303535	-21	kworker/u16:0+flush-8:0	12:29:52	6
662951	99	31	29,2	cyclictest	1155350	-21	kworker/u16:2+events_unbound	11:22:42	6
662951	99	31	29,2	cyclictest	1142850	-21	kworker/u16:3+flush-8:0	11:09:41	6
662951	99	31	29,2	cyclictest	1057149	-21	kworker/u16:1+events_unbound	10:09:33	6
662951	99	31	28,2	cyclictest	764312	-21	kworker/u16:1+flush-8:0	09:52:53	6
662951	99	31	28,2	cyclictest	764312	-21	kworker/u16:1+events_unbound	09:47:53	6
662946	99	31	29,2	cyclictest	830896	-21	kworker/u16:2+events_unbound	09:23:57	5
662946	99	31	29,2	cyclictest	764312	-21	kworker/u16:1+flush-8:0	09:53:32	5
662946	99	31	29,2	cyclictest	764312	-21	kworker/u16:1+events_unbound	09:15:13	5
662946	99	31	29,2	cyclictest	1265039	-21	kworker/u16:2+flush-8:0	11:39:21	5
662946	99	31	29,2	cyclictest	1142850	-21	kworker/u16:3+events_unbound	10:57:28	5
662942	99	31	28,2	cyclictest	1057149	-21	kworker/u16:1+flush-8:0	10:13:07	4
662951	99	30	28,2	cyclictest	830896	-21	kworker/u16:2+events_unbound	09:21:13	6
662951	99	30	28,2	cyclictest	1303535	-21	kworker/u16:0+flush-8:0	12:16:45	6
662951	99	30	28,2	cyclictest	1303535	-21	kworker/u16:0+events_unbound	11:54:08	6
662951	99	30	28,2	cyclictest	1288892	-21	kworker/u16:4+flush-8:0	12:04:36	6
662951	99	30	28,2	cyclictest	1142850	-21	kworker/u16:3+flush-8:0	10:50:12	6
662951	99	30	28,2	cyclictest	1120453	-21	kworker/u16:2+events_unbound	10:40:37	6
662951	99	30	28,2	cyclictest	1023586	-21	kworker/u16:3+events_unbound	10:06:37	6
662946	99	30	28,2	cyclictest	900250	-21	kworker/u16:0+flush-8:0	10:01:05	5
662946	99	30	28,2	cyclictest	830896	-21	kworker/u16:2+flush-8:0	09:44:21	5
662946	99	30	28,2	cyclictest	830896	-21	kworker/u16:2+flush-8:0	09:44:21	5
662946	99	30	28,2	cyclictest	1155350	-21	kworker/u16:2+events_unbound	11:21:40	5
662946	99	30	28,2	cyclictest	1142729	-21	kworker/u16:0+events_unbound	10:49:17	5
662946	99	30	28,2	cyclictest	1023586	-21	kworker/u16:3+events_unbound	10:27:49	5
662942	99	30	28,2	cyclictest	598673	-21	kworker/u16:3+events_unbound	07:16:55	4
662942	99	30	28,2	cyclictest	1057149	-21	kworker/u16:1+events_unbound	10:23:12	4
662942	99	30	25,3	cyclictest	830896	-21	kworker/u16:2+events_unbound	09:08:03	4
662616	2	30	20,7	sleep6	0	-21	swapper/6	07:07:16	6
662951	99	29	27,2	cyclictest	773799	-21	kworker/u16:3+flush-8:0	08:44:17	6
662951	99	29	27,2	cyclictest	764312	-21	kworker/u16:1+flush-8:0	09:16:10	6
662951	99	29	27,2	cyclictest	764312	-21	kworker/u16:1+flush-8:0	07:58:51	6
662951	99	29	27,2	cyclictest	1288892	-21	kworker/u16:4+flush-8:0	11:49:40	6
662951	99	29	27,2	cyclictest	1277567	-21	kworker/u16:3+events_unbound	11:45:13	6
662951	99	29	27,2	cyclictest	1265039	-21	kworker/u16:2+events_unbound	11:40:00	6
662951	99	29	27,2	cyclictest	1229246	-21	kworker/u16:1+events_unbound	11:32:09	6
662946	99	29	27,2	cyclictest	900250	-21	kworker/u16:0+flush-8:0	09:35:09	5
662946	99	29	27,2	cyclictest	830896	-21	kworker/u16:2+flush-8:0	09:30:04	5
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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