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 Sat Apr 18, 2026 12:43:33)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
259247	2	58	47,7	sleep4	0	-21	swapper/4	07:04:53	4
268696	99	51	43,7	cyclictest	444655	-21	latency_hist	08:39:45	7
268304	2	50	39,8	sleep5	0	-21	swapper/5	07:08:31	5
268696	99	46	38,7	cyclictest	514401	-21	latency_hist	09:14:46	7
268696	99	44	36,7	cyclictest	735126	-21	latency_hist	10:44:45	7
260067	2	41	3,32	sleep7	0	-21	swapper/7	07:05:04	7
268683	99	38	35,2	cyclictest	597938	-21	kworker/u16:2+flush-8:0	09:59:45	4
268693	99	37	35,2	cyclictest	992248	-21	kworker/u16:0+events_unbound	12:39:11	6
268693	99	37	35,2	cyclictest	879548	-21	kworker/u16:1+events_unbound	12:05:46	6
268693	99	37	35,2	cyclictest	879548	-21	kworker/u16:1+events_unbound	11:48:12	6
268693	99	36	34,2	cyclictest	820902	-21	kworker/u16:4+events_unbound	12:33:27	6
268693	99	36	34,2	cyclictest	747484	-21	kworker/u16:2+events_unbound	11:26:39	6
268693	99	36	34,2	cyclictest	747484	-21	kworker/u16:2+events_unbound	11:20:35	6
268693	99	36	34,2	cyclictest	609205	-21	kworker/u16:3+events_unbound	11:07:00	6
268693	99	36	34,2	cyclictest	609205	-21	kworker/u16:3+events_unbound	10:51:59	6
268693	99	36	34,2	cyclictest	609205	-21	kworker/u16:3+events_unbound	10:42:23	6
268693	99	36	34,2	cyclictest	387533	-21	kworker/u16:0+events_unbound	09:36:43	6
268693	99	36	34,2	cyclictest	387533	-21	kworker/u16:0+events_unbound	09:36:43	6
268693	99	35	33,2	cyclictest	955706	-21	kworker/u16:3+events_unbound	12:28:47	6
268693	99	35	33,2	cyclictest	952910	-21	kworker/u16:2+events_unbound	12:14:26	6
268693	99	35	33,2	cyclictest	820902	-21	kworker/u16:4+events_unbound	12:18:55	6
268693	99	35	33,2	cyclictest	820902	-21	kworker/u16:4+events_unbound	11:37:59	6
268693	99	35	33,2	cyclictest	820902	-21	kworker/u16:4+events_unbound	11:33:39	6
268693	99	35	33,2	cyclictest	724732	-21	kworker/u16:0+events_unbound	11:14:10	6
268693	99	35	33,2	cyclictest	674058	-21	kworker/u16:1+events_unbound	10:37:00	6
268693	99	35	33,2	cyclictest	674058	-21	kworker/u16:1+events_unbound	10:33:39	6
268693	99	35	33,2	cyclictest	435451	-21	kworker/u16:1+events_unbound	09:29:31	6
268693	99	35	33,2	cyclictest	435451	-21	kworker/u16:1+events_unbound	09:14:46	6
268696	99	34	30,3	cyclictest	6946	-21	fwupd	10:00:48	7
268693	99	34	32,2	cyclictest	820902	-21	kworker/u16:4+events_unbound	11:59:03	6
268693	99	34	32,2	cyclictest	820902	-21	kworker/u16:4+events_unbound	11:41:51	6
268693	99	34	32,2	cyclictest	820902	-21	kworker/u16:4+events_unbound	11:41:51	6
268693	99	34	32,2	cyclictest	747484	-21	kworker/u16:2+events_unbound	11:53:07	6
268693	99	34	32,2	cyclictest	597938	-21	kworker/u16:2+events_unbound	10:09:19	6
268693	99	34	31,2	cyclictest	387533	-21	kworker/u16:0+events_unbound	08:24:48	6
268296	2	34	9,8	sleep6	0	-21	swapper/6	07:08:24	6
268693	99	33	31,2	cyclictest	747484	-21	kworker/u16:2+events_unbound	11:17:35	6
268693	99	33	31,2	cyclictest	724732	-21	kworker/u16:0+events_unbound	10:47:39	6
268693	99	33	31,2	cyclictest	597938	-21	kworker/u16:2+events_unbound	10:19:23	6
268693	99	33	31,2	cyclictest	597938	-21	kworker/u16:2+events_unbound	10:19:23	6
268693	99	33	31,2	cyclictest	597938	-21	kworker/u16:2+events_unbound	09:48:40	6
268693	99	32	30,2	cyclictest	955706	-21	kworker/u16:3+events_unbound	12:21:51	6
268693	99	32	30,2	cyclictest	955706	-21	kworker/u16:3+events_unbound	12:21:51	6
268693	99	32	30,2	cyclictest	820902	-21	kworker/u16:4+flush-8:0	12:00:42	6
268693	99	32	30,2	cyclictest	724732	-21	kworker/u16:0+flush-8:0	10:55:23	6
268693	99	32	30,2	cyclictest	539023	-21	kworker/u16:4+events_unbound	09:57:08	6
268693	99	32	30,2	cyclictest	483066	-21	kworker/u16:2+events_unbound	09:14:24	6
268693	99	32	30,2	cyclictest	435451	-21	kworker/u16:1+events_unbound	09:51:36	6
268693	99	32	30,2	cyclictest	435451	-21	kworker/u16:1+events_unbound	09:22:35	6
268693	99	32	30,2	cyclictest	387533	-21	kworker/u16:0+events_unbound	09:44:28	6
268693	99	31	29,2	cyclictest	609205	-21	kworker/u16:3+events_unbound	10:20:47	6
268693	99	31	28,2	cyclictest	329946	-21	kworker/u16:1+events_unbound	07:39:47	6
268693	99	30	28,2	cyclictest	724732	-21	kworker/u16:0+events_unbound	11:02:03	6
268693	99	30	28,2	cyclictest	609205	-21	kworker/u16:3+events_unbound	10:28:15	6
268693	99	30	28,2	cyclictest	597938	-21	kworker/u16:2+events_unbound	10:03:31	6
268693	99	30	28,2	cyclictest	435451	-21	kworker/u16:1+events_unbound	09:06:47	6
268693	99	30	28,2	cyclictest	387533	-21	kworker/u16:0+events_unbound	09:31:46	6
268693	99	30	28,2	cyclictest	278182	-21	kworker/u16:0+events_unbound	07:27:48	6
268693	99	29	26,2	cyclictest	256257	-21	kworker/u16:4+events_unbound	07:19:55	6
268693	99	29	26,2	cyclictest	256257	-21	kworker/u16:4+events_unbound	07:19:55	6
268683	99	28	26,2	cyclictest	820902	-21	kworker/u16:4+events_unbound	11:34:59	4
268683	99	28	25,2	cyclictest	609205	-21	kworker/u16:3+flush-8:0	11:05:02	4
268693	99	27	25,2	cyclictest	387533	-21	kworker/u16:0+events_unbound	08:15:56	6
268683	99	27	24,2	cyclictest	256257	-21	kworker/u16:4+flush-8:0	07:25:04	4
268683	99	26	24,2	cyclictest	539023	-21	kworker/u16:4+flush-8:0	09:45:10	4
268696	99	25	20,4	cyclictest	563458	-21	latency_hist	09:34:45	7
268693	99	25	23,2	cyclictest	3745393	-21	kworker/u16:1+events_unbound	07:10:56	6
268693	99	25	23,2	cyclictest	278182	-21	kworker/u16:0+flush-8:0	07:38:47	6
268683	99	25	23,2	cyclictest	609205	-21	kworker/u16:3+events_unbound	10:30:00	4
268683	99	25	22,2	cyclictest	952910	-21	kworker/u16:2+flush-8:0	12:24:40	4
268683	99	25	22,2	cyclictest	952910	-21	kworker/u16:2+flush-8:0	12:24:40	4
268693	99	24	22,2	cyclictest	609205	-21	kworker/u16:3+events_unbound	10:14:34	6
268693	99	24	22,2	cyclictest	454433	-21	kworker/u16:3+events_unbound	09:03:55	6
268693	99	24	22,2	cyclictest	387533	-21	kworker/u16:0+events_unbound	08:21:48	6
268696	99	23	17,5	cyclictest	368001	-21	latency_hist	07:59:45	7
268693	99	23	21,2	cyclictest	376632	-21	kworker/u16:2+events_unbound	08:05:47	6
268683	99	23	21,2	cyclictest	674058	-21	kworker/u16:1+events_unbound	10:39:58	4
268696	99	22	17,4	cyclictest	635	-21	systemd-journal	11:54:45	7
268693	99	22	20,2	cyclictest	425397	-21	kworker/u16:2+events_unbound	08:34:07	6
268683	99	22	18,3	cyclictest	483066	-21	kworker/u16:2+events_unbound	09:24:57	4
268693	99	21	19,2	cyclictest	387533	-21	kworker/u16:0+events_unbound	08:54:48	6
268693	99	21	19,2	cyclictest	278182	-21	kworker/u16:0+events_unbound	07:50:07	6
268683	99	21	19,2	cyclictest	879548	-21	kworker/u16:1+events_unbound	11:54:59	4
268683	99	21	18,2	cyclictest	724732	-21	kworker/u16:0+flush-8:0	11:01:52	4
268696	99	20	13,6	cyclictest	796323	-21	latency_hist	11:09:45	7
268683	99	20	18,2	cyclictest	387533	-21	kworker/u16:0+flush-8:0	08:24:45	4
268693	99	19	17,2	cyclictest	256257	-21	kworker/u16:4+events_unbound	07:32:16	6
268683	99	19	16,2	cyclictest	483066	-21	kworker/u16:2+flush-8:0	09:14:55	4
268696	99	18	14,3	cyclictest	1234	-21	snmpd	09:00:22	7
268696	99	18	1,2	cyclictest	682952	-21	ssh	10:20:08	7
268696	99	18	10,7	cyclictest	759600	-21	latency_hist	10:54:45	7
268693	99	18	16,2	cyclictest	435451	-21	kworker/u16:1+events_unbound	08:47:55	6
268683	99	18	15,2	cyclictest	674058	-21	kworker/u16:1+flush-8:0	10:25:02	4
268683	99	18	0,17	cyclictest	607493	-21	kthreadcore	09:50:07	4
268696	99	17	1,14	cyclictest	844939	-21	ssh	11:29:04	7
268696	99	17	0,1	cyclictest	0	-21	swapper/7	10:15:10	7
268696	99	17	0,1	cyclictest	0	-21	swapper/7	10:15:10	7
268693	99	17	15,2	cyclictest	329946	-21	kworker/u16:1+events_unbound	07:46:16	6
268693	99	17	0,3	cyclictest	359008	-21	cpuspeed_turbos	07:54:57	6
268688	99	17	16,1	cyclictest	609205	-21	kworker/u16:3+flush-8:0	10:49:45	5
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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