OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, slot #4

Rack #0/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #1/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #2/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #3/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #4/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #5/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #6/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #7/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #8/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #9/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #a/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #b/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #c/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #d/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #e/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #f/#0 #1 #2 #3 #4 #5 #6 #7 #8
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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 rack0slot4s.osadl.org (updated Sun Jul 12, 2026 00:46:20)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
897031	2	390	371,12	sleep9	0	-21	swapper/9	19:06:34	15
897096	2	374	335,32	sleep14	0	-21	swapper/14	19:07:28	6
897275	2	366	322,13	sleep13	0	-21	swapper/13	19:09:19	5
897267	2	358	338,13	sleep6	0	-21	swapper/6	19:09:12	12
897315	2	353	334,13	sleep11	0	-21	swapper/11	19:09:49	3
896968	2	352	332,13	sleep7	0	-21	swapper/7	19:05:44	13
897056	2	351	331,13	sleep15	0	-21	swapper/15	19:06:56	7
897007	2	351	315,13	sleep8	0	-21	swapper/8	19:06:17	14
897282	2	350	331,13	sleep3	0	-21	swapper/3	19:09:26	9
896980	2	350	331,12	sleep2	0	-21	swapper/2	19:05:55	8
897271	2	349	329,13	sleep10	0	-21	swapper/10	19:09:16	2
893822	2	349	330,13	sleep0	0	-21	swapper/0	19:05:05	0
897220	2	348	328,13	sleep5	0	-21	swapper/5	19:08:39	11
897053	2	348	330,12	sleep12	0	-21	swapper/12	19:06:54	4
897017	2	346	326,13	sleep1	0	-21	swapper/1	19:06:26	1
897003	2	345	323,14	sleep4	0	-21	swapper/4	19:06:13	10
897696	99	63	62,1	cyclictest	923354	-21	kworker/u32:0+flush-259:0	19:50:20	11
897723	99	53	4,25	cyclictest	0	-21	swapper/14	19:40:37	6
897706	99	45	41,3	cyclictest	863859	-21	kworker/u32:1+flush-259:0	19:16:25	14
897716	99	42	40,1	cyclictest	832071	-21	kworker/u32:2+flush-259:0	19:20:15	3
994375	2	41	0,1	sleep14	151	-21	ksoftirqd/14	21:00:59	6
897723	99	40	27,0	cyclictest	0	-21	swapper/14	23:09:19	6
897723	99	39	3,25	cyclictest	0	-21	swapper/14	22:25:22	6
897723	99	38	2,25	cyclictest	0	-21	swapper/14	19:51:36	6
897687	99	37	31,5	cyclictest	977641	-21	kworker/u32:3+flush-259:0	21:14:36	8
897680	99	37	35,2	cyclictest	1041745	-21	kworker/u32:1+flush-259:0	22:00:16	0
897716	99	36	33,2	cyclictest	1009735	-21	kworker/u32:0+flush-259:0	22:18:11	3
897694	99	36	36,0	cyclictest	0	-21	swapper/4	00:27:27	10
897680	99	36	33,2	cyclictest	1214820	-21	kworker/u32:0+flush-259:0	00:33:51	0
897706	99	35	34,1	cyclictest	1131382	-21	kworker/u32:4+flush-259:0	22:55:17	14
897687	99	35	32,2	cyclictest	1120545	-21	kworker/u32:3+flush-259:0	00:04:26	8
897723	99	34	29,5	cyclictest	1774	-21	snmpd	00:04:29	6
897727	99	33	33,0	cyclictest	1053592	-21	kworker/u32:4+flush-259:0	22:15:37	7
897727	99	33	31,1	cyclictest	1114036	-21	kworker/u32:2+flush-259:0	22:54:01	7
897723	99	33	29,4	cyclictest	1774	-21	snmpd	21:23:45	6
897716	99	33	30,3	cyclictest	1028911	-21	kworker/u32:3+events_unbound	21:37:27	3
897694	99	33	33,0	cyclictest	0	-21	swapper/4	22:30:58	10
897690	99	33	32,1	cyclictest	1152887	-21	kworker/u32:2+events_unbound	23:30:06	9
897690	99	33	32,1	cyclictest	1152887	-21	kworker/u32:2+events_unbound	23:30:05	9
897680	99	33	33,0	cyclictest	0	-21	swapper/0	23:37:30	0
897680	99	33	33,0	cyclictest	0	-21	swapper/0	23:37:29	0
897680	99	33	32,1	cyclictest	1080521	-21	kworker/u32:1+events_unbound	22:36:20	0
897723	99	32	7,0	cyclictest	0	-21	swapper/14	21:52:26	6
897723	99	32	29,3	cyclictest	1774	-21	snmpd	19:12:49	6
897694	99	32	4,28	cyclictest	0	-21	swapper/4	22:17:10	10
897694	99	32	32,0	cyclictest	0	-21	swapper/4	19:35:52	10
897687	99	32	5,1	cyclictest	1053592	-21	kworker/u32:4+flush-259:0	22:05:48	8
897687	99	32	28,2	cyclictest	782	-21	systemd-journal	20:39:13	8
897687	99	32	27,4	cyclictest	1774	-21	snmpd	22:52:39	8
897687	99	32	0,31	cyclictest	1036161	-21	ssh	21:37:18	8
897687	99	32	0,29	cyclictest	0	-21	swapper/2	23:26:04	8
897687	99	32	0,29	cyclictest	0	-21	swapper/2	21:53:05	8
897687	99	32	0,29	cyclictest	0	-21	swapper/2	20:47:31	8
897687	99	32	0,29	cyclictest	0	-21	swapper/2	20:20:34	8
897687	99	32	0,29	cyclictest	0	-21	swapper/2	20:20:33	8
897687	99	32	0,29	cyclictest	0	-21	swapper/2	20:16:23	8
897687	99	32	0,29	cyclictest	0	-21	swapper/2	20:12:07	8
897687	99	32	0,29	cyclictest	0	-21	swapper/2	19:58:21	8
897687	99	32	0,29	cyclictest	0	-21	swapper/2	19:49:23	8
897687	99	32	0,29	cyclictest	0	-21	swapper/2	19:40:28	8
897687	99	32	0,29	cyclictest	0	-21	swapper/2	00:30:27	8
897685	99	32	0,32	cyclictest	1093571	-21	kworker/u32:5+netns	22:35:17	1
897727	99	31	0,30	cyclictest	0	-21	swapper/15	23:23:21	7
897727	99	31	0,30	cyclictest	0	-21	swapper/15	19:25:17	7
897723	99	31	7,13	cyclictest	0	-21	swapper/14	22:58:19	6
897723	99	31	7,13	cyclictest	0	-21	swapper/14	22:47:20	6
897723	99	31	7,13	cyclictest	0	-21	swapper/14	19:18:39	6
897723	99	31	7,13	cyclictest	0	-21	swapper/14	00:26:12	6
897723	99	31	28,3	cyclictest	1774	-21	snmpd	22:00:17	6
897721	99	31	0,30	cyclictest	0	-21	swapper/13	20:58:23	5
897721	99	31	0,30	cyclictest	0	-21	swapper/13	20:42:55	5
897717	99	31	30,1	cyclictest	0	-21	swapper/12	22:17:26	4
897717	99	31	0,30	cyclictest	0	-21	swapper/12	21:06:03	4
897717	99	31	0,30	cyclictest	0	-21	swapper/12	20:56:15	4
897716	99	31	0,30	cyclictest	0	-21	swapper/11	20:38:56	3
897708	99	31	30,1	cyclictest	1774	-21	snmpd	23:41:29	15
897708	99	31	30,1	cyclictest	1774	-21	snmpd	23:41:28	15
897708	99	31	30,1	cyclictest	0	-21	swapper/9	00:06:47	15
897708	99	31	29,2	cyclictest	1774	-21	snmpd	23:58:56	15
897708	99	31	0,30	cyclictest	0	-21	swapper/9	20:25:52	15
897708	99	31	0,30	cyclictest	0	-21	swapper/9	20:25:51	15
897708	99	31	0,30	cyclictest	0	-21	swapper/9	20:20:37	15
897708	99	31	0,30	cyclictest	0	-21	swapper/9	20:20:36	15
897706	99	31	30,1	cyclictest	0	-21	swapper/8	23:27:02	14
897702	99	31	24,7	cyclictest	1774	-21	snmpd	21:59:55	13
897702	99	31	0,30	cyclictest	0	-21	swapper/7	22:58:24	13
897702	99	31	0,30	cyclictest	0	-21	swapper/7	00:25:31	13
897700	99	31	30,1	cyclictest	1774	-21	snmpd	23:26:28	12
897694	99	31	25,4	cyclictest	0	-21	swapper/4	20:45:23	10
897690	99	31	0,30	cyclictest	0	-21	swapper/3	20:35:02	9
897687	99	31	30,1	cyclictest	1774	-21	snmpd	22:17:04	8
897687	99	31	26,3	cyclictest	0	-21	swapper/2	23:00:12	8
897687	99	31	0,30	cyclictest	0	-21	swapper/2	22:36:43	8
897687	99	31	0,28	cyclictest	0	-21	swapper/2	22:56:30	8
897687	99	31	0,28	cyclictest	0	-21	swapper/2	00:17:15	8
897687	99	31	0,28	cyclictest	0	-21	swapper/2	00:09:53	8
897685	99	31	29,1	cyclictest	1214820	-21	kworker/u32:0+flush-259:0	00:25:19	1
897727	99	30	29,1	cyclictest	1774	-21	snmpd	00:20:26	7
897727	99	30	0,30	cyclictest	0	-21	swapper/15	23:41:14	7
897727	99	30	0,30	cyclictest	0	-21	swapper/15	23:41:13	7
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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