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 50 highest latencies:

System rack0slot4s.osadl.org (updated Tue Aug 18, 2026 00:45:12)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
3920371	99	110	105,4	cyclictest	3890407	-21	kworker/u32:1+events_unbound	19:12:25	5
3920349	99	102	100,1	cyclictest	4021461	-21	kworker/u32:4+events_unbound	21:07:37	11
3919675	2	67	64,1	sleep10	0	-21	swapper/10	19:06:26	2
3920351	99	66	65,1	cyclictest	4076892	-21	kworker/u32:4+flush-259:0	22:45:18	12
3920354	99	63	55,6	cyclictest	4065795	-21	kworker/u32:0+events_unbound	21:46:01	13
3920349	99	62	59,2	cyclictest	3831632	-21	kworker/u32:4+events_unbound	19:20:16	11
3920354	99	61	56,4	cyclictest	4171512	-21	kworker/u32:4+flush-259:0	23:31:02	13
4142643	2	59	0,0	sleep2	0	-21	swapper/2	22:44:50	8
3920351	99	59	57,2	cyclictest	3918429	-21	kworker/u32:2+events_unbound	19:24:00	12
3919598	2	57	55,1	sleep4	0	-21	swapper/4	19:05:32	10
3919912	2	56	53,2	sleep12	0	-21	swapper/12	19:09:25	4
3920351	99	53	51,2	cyclictest	17106	-21	kworker/u32:3+events_unbound	23:55:26	12
3920373	99	52	50,2	cyclictest	3918429	-21	kworker/u32:2+flush-259:0	22:16:27	6
3920362	99	52	47,3	cyclictest	4052401	-21	kworker/u32:3+events_unbound	21:39:20	2
3920341	99	52	0,37	cyclictest	0	-21	swapper/3	19:15:01	9
3920351	99	50	48,2	cyclictest	4171512	-21	kworker/u32:4+events_unbound	23:37:27	12
3920351	99	49	48,1	cyclictest	3925161	-21	kworker/u32:3+events_unbound	19:30:21	12
3920362	99	48	47,1	cyclictest	3918429	-21	kworker/u32:2+events_unbound	20:59:32	2
3920371	99	47	45,1	cyclictest	3831632	-21	kworker/u32:4+events_unbound	19:40:14	5
3920371	99	46	44,2	cyclictest	4052401	-21	kworker/u32:3+flush-259:0	22:09:39	5
4189	98	45	0,43	rtkit-daemon	0	-21	swapper/1	19:09:12	1
3920333	99	45	43,1	cyclictest	17106	-21	kworker/u32:3+events_unbound	00:07:49	0
3919684	2	45	43,1	sleep2	0	-21	swapper/2	19:06:35	8
3920371	99	44	43,1	cyclictest	4173097	-21	kworker/u32:5+events_unbound	23:20:05	5
3920371	99	44	41,2	cyclictest	3890407	-21	kworker/u32:1+events_unbound	19:15:01	5
3920362	99	44	43,1	cyclictest	4065795	-21	kworker/u32:0+events_unbound	21:50:13	2
3920371	99	43	42,1	cyclictest	61586	-21	kworker/u32:2+events_unbound	00:14:51	5
3920368	99	43	42,1	cyclictest	4052401	-21	kworker/u32:3+flush-259:0	22:30:22	4
3920368	99	43	41,1	cyclictest	3907068	-21	kworker/u32:0+flush-259:0	19:10:14	4
3920365	99	43	41,2	cyclictest	4171512	-21	kworker/u32:4+events_unbound	23:07:18	3
3920362	99	43	42,1	cyclictest	17106	-21	kworker/u32:3+flush-259:0	00:05:26	2
3920351	99	43	41,2	cyclictest	68538	-21	kworker/u32:3+events_unbound	00:26:44	12
3920351	99	43	41,2	cyclictest	68538	-21	kworker/u32:3+events_unbound	00:26:43	12
3919802	2	43	40,2	sleep6	0	-21	swapper/6	19:07:59	12
3920373	99	42	4,25	cyclictest	1161449	-21	thunderbird	20:13:45	6
3920371	99	42	40,1	cyclictest	4076892	-21	kworker/u32:4+events_unbound	22:45:19	5
3920362	99	42	41,1	cyclictest	4030949	-21	kworker/u32:5+events_unbound	21:15:39	2
3920349	99	42	40,2	cyclictest	3918429	-21	kworker/u32:2+events_unbound	22:22:51	11
3919899	2	42	40,1	sleep0	0	-21	swapper/0	19:09:13	0
3920376	99	41	38,2	cyclictest	3918429	-21	kworker/u32:2+events_unbound	21:35:22	7
3920360	99	41	40,1	cyclictest	4134064	-21	kworker/u32:2+events_unbound	22:40:26	15
3920341	99	41	38,1	cyclictest	0	-21	swapper/3	22:17:44	9
3920362	99	40	39,1	cyclictest	3918429	-21	kworker/u32:2+events_unbound	22:14:17	2
3920349	99	40	39,1	cyclictest	3986768	-21	kworker/u32:1+events_unbound	20:30:13	11
3919613	2	40	37,2	sleep15	0	-21	swapper/15	19:05:43	7
3920362	99	39	27,10	cyclictest	3992361	-21	kworker/10:2+events	21:10:16	2
3920351	99	39	38,1	cyclictest	3918429	-21	kworker/u32:2+events_unbound	21:36:26	12
3920339	99	39	38,1	cyclictest	4171512	-21	kworker/u32:4+events_unbound	00:10:23	8
3919955	2	39	37,1	sleep11	0	-21	swapper/11	19:09:56	3
3919779	2	39	37,1	sleep5	0	-21	swapper/5	19:07:42	11
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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