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 Wed Jan 21, 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
3777085	2	64	52,8	sleep5	0	-21	swapper/5	07:03:56	5
3777085	2	64	52,8	sleep5	0	-21	swapper/5	07:03:56	5
3777327	2	54	43,8	sleep6	0	-21	swapper/6	07:07:18	6
3777327	2	54	43,8	sleep6	0	-21	swapper/6	07:07:18	6
3777296	2	53	19,30	sleep7	0	-21	swapper/7	07:06:55	7
3777296	2	53	19,30	sleep7	0	-21	swapper/7	07:06:55	7
3777614	99	49	46,2	cyclictest	3848971	-21	kworker/u16:3+flush-8:0	07:47:18	4
3777614	99	47	44,2	cyclictest	172294	-21	kworker/u16:3+flush-8:0	11:57:17	4
3777629	99	40	35,4	cyclictest	27220	-21	latency_hist	10:32:18	7
3777624	99	38	36,2	cyclictest	4110899	-21	kworker/u16:4+events_unbound	10:28:25	6
3777113	2	38	28,7	sleep4	0	-21	swapper/4	07:04:19	4
3777113	2	38	28,7	sleep4	0	-21	swapper/4	07:04:19	4
3777629	99	37	32,4	cyclictest	88411	-21	latency_hist	10:57:17	7
3777624	99	37	35,2	cyclictest	4157617	-21	kworker/u16:1+events_unbound	11:12:55	6
3777624	99	37	35,2	cyclictest	235435	-21	kworker/u16:1+events_unbound	12:15:35	6
3777629	99	36	31,4	cyclictest	4025425	-21	latency_hist	09:12:18	7
3777624	99	36	34,2	cyclictest	4157618	-21	kworker/u16:3+events_unbound	10:05:16	6
3777624	99	36	34,2	cyclictest	235435	-21	kworker/u16:1+events_unbound	12:09:39	6
3777614	99	36	34,2	cyclictest	151163	-21	kworker/u16:0+events_unbound	11:29:18	4
3777624	99	35	33,2	cyclictest	11871	-21	kworker/u16:0+events_unbound	10:51:37	6
3777614	99	35	33,2	cyclictest	3810296	-21	kworker/u16:0+flush-8:0	07:32:17	4
3777614	99	35	33,2	cyclictest	3810296	-21	kworker/u16:0+flush-8:0	07:32:17	4
3777614	99	35	32,2	cyclictest	4157618	-21	kworker/u16:3+flush-8:0	10:12:28	4
3777624	99	34	32,2	cyclictest	88434	-21	kworker/u16:2+events_unbound	11:33:03	6
3777624	99	34	32,2	cyclictest	4157617	-21	kworker/u16:1+events_unbound	10:19:53	6
3777624	99	34	32,2	cyclictest	11871	-21	kworker/u16:0+flush-8:0	10:37:59	6
3777629	99	33	27,5	cyclictest	2439	-21	latency_hist	10:22:17	7
3777624	99	33	31,2	cyclictest	4003575	-21	kworker/u16:0+flush-8:0	09:32:45	6
3777620	99	33	31,2	cyclictest	3917837	-21	kworker/u16:3+flush-8:0	09:07:17	5
3777624	99	32	30,2	cyclictest	4157617	-21	kworker/u16:1+events_unbound	10:13:38	6
3777624	99	32	30,2	cyclictest	3766494	-21	kworker/u16:2+events_unbound	09:45:41	6
3777624	99	32	30,2	cyclictest	185230	-21	kworker/u16:0+events_unbound	11:41:50	6
3777614	99	32	30,2	cyclictest	3917837	-21	kworker/u16:3+flush-8:0	09:02:17	4
3777624	99	31	29,2	cyclictest	27264	-21	kworker/u16:2+events_unbound	10:44:09	6
3777624	99	31	29,2	cyclictest	172294	-21	kworker/u16:3+events_unbound	11:59:37	6
3777624	99	30	28,2	cyclictest	4157618	-21	kworker/u16:3+events_unbound	10:10:38	6
3777624	99	30	28,2	cyclictest	4157617	-21	kworker/u16:1+events_unbound	11:07:25	6
3777624	99	30	28,2	cyclictest	283256	-21	kworker/u16:2+events_unbound	12:33:04	6
3777624	99	30	28,2	cyclictest	235435	-21	kworker/u16:1+events_unbound	12:23:32	6
3777624	99	30	28,2	cyclictest	235435	-21	kworker/u16:1+events_unbound	12:05:15	6
3777624	99	30	28,2	cyclictest	172294	-21	kworker/u16:3+events_unbound	11:56:26	6
3777624	99	29	27,2	cyclictest	4110899	-21	kworker/u16:4+events_unbound	10:55:53	6
3777624	99	29	27,2	cyclictest	4003575	-21	kworker/u16:0+events_unbound	09:48:39	6
3777624	99	29	27,2	cyclictest	3917837	-21	kworker/u16:3+events_unbound	09:10:54	6
3777624	99	29	27,2	cyclictest	3786347	-21	kworker/u16:4+events_unbound	07:40:37	6
3777624	99	29	27,2	cyclictest	172294	-21	kworker/u16:3+events_unbound	11:31:37	6
3777624	99	29	26,2	cyclictest	4110899	-21	kworker/u16:4+events_unbound	11:17:26	6
3777624	99	29	24,2	cyclictest	4110899	-21	kworker/u16:4+events_unbound	11:47:13	6
3777614	99	29	27,2	cyclictest	4003575	-21	kworker/u16:0+flush-8:0	09:17:33	4
3777624	99	28	26,2	cyclictest	88434	-21	kworker/u16:2+flush-8:0	11:03:05	6
3777624	99	28	26,2	cyclictest	4110899	-21	kworker/u16:4+events_unbound	11:24:38	6
3777624	99	28	26,2	cyclictest	4110899	-21	kworker/u16:4+events_unbound	09:55:39	6
3777624	99	28	26,2	cyclictest	4003575	-21	kworker/u16:0+events_unbound	09:03:27	6
3777624	99	28	26,2	cyclictest	3917837	-21	kworker/u16:3+events_unbound	09:18:12	6
3777624	99	28	26,2	cyclictest	3766494	-21	kworker/u16:2+events_unbound	07:19:30	6
3777624	99	28	26,2	cyclictest	283256	-21	kworker/u16:2+events_unbound	12:20:59	6
3777624	99	28	25,3	cyclictest	4003575	-21	kworker/u16:0+events_unbound	09:58:57	6
3777614	99	28	26,2	cyclictest	3917837	-21	kworker/u16:3+flush-8:0	08:27:18	4
3777629	99	27	22,4	cyclictest	650	-21	systemd-journal	11:52:18	7
3777624	99	27	25,2	cyclictest	4074480	-21	kworker/u16:1+events_unbound	09:39:34	6
3777624	99	27	25,2	cyclictest	3966479	-21	kworker/u16:0+events_unbound	08:44:33	6
3777624	99	27	25,2	cyclictest	3917837	-21	kworker/u16:3+flush-8:0	08:32:56	6
3777624	99	27	25,2	cyclictest	3917837	-21	kworker/u16:3+events_unbound	09:29:30	6
3777624	99	27	25,2	cyclictest	3917837	-21	kworker/u16:3+events_unbound	08:21:45	6
3777624	99	27	25,2	cyclictest	3786347	-21	kworker/u16:4+events_unbound	07:48:57	6
3777624	99	27	25,2	cyclictest	3766494	-21	kworker/u16:2+events_unbound	09:23:15	6
3777614	99	27	25,2	cyclictest	4110899	-21	kworker/u16:4+flush-8:0	10:22:17	4
3777614	99	27	25,2	cyclictest	3907343	-21	kworker/u16:1+flush-8:0	08:17:41	4
3777614	99	27	25,2	cyclictest	27264	-21	kworker/u16:2+flush-8:0	10:47:13	4
14222	2	27	0,1	sleep4	0	-21	swapper/4	10:25:55	4
3777624	99	26	24,2	cyclictest	3810296	-21	kworker/u16:0+events_unbound	07:25:57	6
3777624	99	25	23,2	cyclictest	88434	-21	kworker/u16:2+events_unbound	11:49:57	6
3777624	99	25	23,2	cyclictest	88434	-21	kworker/u16:2+events_unbound	11:00:54	6
3777624	99	25	23,2	cyclictest	4110899	-21	kworker/u16:4+events_unbound	10:23:18	6
3777624	99	25	23,2	cyclictest	3984324	-21	kworker/u16:1+events_unbound	08:55:57	6
3777624	99	25	23,2	cyclictest	3907343	-21	kworker/u16:1+events_unbound	08:23:29	6
3777624	99	25	23,2	cyclictest	3868349	-21	kworker/u16:0+flush-8:0	08:02:13	6
3777624	99	25	23,2	cyclictest	3766494	-21	kworker/u16:2+events_unbound	07:45:20	6
3777624	99	25	23,2	cyclictest	3766494	-21	kworker/u16:2+events_unbound	07:31:41	6
3777624	99	25	23,2	cyclictest	3766494	-21	kworker/u16:2+events_unbound	07:31:41	6
3777624	99	25	23,2	cyclictest	11871	-21	kworker/u16:0+events_unbound	10:33:05	6
3777614	99	25	23,2	cyclictest	235435	-21	kworker/u16:1+events_unbound	12:07:44	4
3777614	99	25	23,2	cyclictest	185230	-21	kworker/u16:0+flush-8:0	11:42:17	4
3777614	99	25	21,2	cyclictest	222199	-21	kworker/u16:0+events_unbound	11:57:20	4
3777629	99	24	0,23	cyclictest	247771	-21	date	12:02:17	7
3777624	99	24	22,2	cyclictest	3917837	-21	kworker/u16:3+events_unbound	08:31:08	6
3777624	99	24	22,2	cyclictest	3848971	-21	kworker/u16:3+events_unbound	07:56:52	6
3777624	99	24	21,2	cyclictest	3984324	-21	kworker/u16:1+events_unbound	08:57:21	6
75909	2	23	0,1	sleep4	0	-21	swapper/4	10:51:52	4
3777629	99	23	19,3	cyclictest	124	-21	kswapd0	11:12:30	7
3777624	99	23	21,2	cyclictest	4003575	-21	kworker/u16:0+events_unbound	09:15:14	6
3777624	99	23	21,2	cyclictest	3907343	-21	kworker/u16:1+flush-8:0	08:38:11	6
3777624	99	23	21,2	cyclictest	3766494	-21	kworker/u16:2+events_unbound	08:50:29	6
3777624	99	23	21,2	cyclictest	3766494	-21	kworker/u16:2+events_unbound	08:11:08	6
3777624	99	23	21,2	cyclictest	3766494	-21	kworker/u16:2+events_unbound	07:36:17	6
3777620	99	23	21,2	cyclictest	4074480	-21	kworker/u16:1+flush-8:0	09:42:48	5
3777620	99	23	20,2	cyclictest	4157617	-21	kworker/u16:1+events_unbound	10:47:32	5
3777624	99	22	20,2	cyclictest	3868349	-21	kworker/u16:0+events_unbound	08:15:08	6
3777624	99	22	20,2	cyclictest	3868349	-21	kworker/u16:0+events_unbound	08:15:08	6
3777624	99	22	20,2	cyclictest	3786347	-21	kworker/u16:4+events_unbound	07:16:13	6
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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