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 50 highest latencies:

System rack0slot2.osadl.org (updated Sat Jul 18, 2026 00:43:29)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
3413062	2	50	40,7	sleep5	0	-21	swapper/5	19:05:48	5
3569108	2	46	0,0	sleep7	3569111	-21	cut	20:25:05	7
3413054	2	45	10,30	sleep7	0	-21	swapper/7	19:05:41	7
3413110	2	37	26,8	sleep4	0	-21	swapper/4	19:06:27	4
3413112	2	36	26,7	sleep6	0	-21	swapper/6	19:06:29	6
3852597	2	29	0,1	chrt	3852598	-21	kthreadcore	22:30:06	7
3413612	99	26	23,2	cyclictest	4063042	-21	kworker/u16:1+flush-8:0	00:29:44	5
3413610	99	26	24,2	cyclictest	3659361	-21	kworker/u16:0+events_unbound	21:30:32	4
3413615	99	25	23,2	cyclictest	3625216	-21	kworker/u16:2+events_unbound	21:45:23	6
3413612	99	25	23,2	cyclictest	3625216	-21	kworker/u16:2+flush-8:0	23:20:14	5
3413612	99	25	23,2	cyclictest	3625216	-21	kworker/u16:2+flush-8:0	21:09:59	5
3413610	99	25	23,2	cyclictest	3773172	-21	kworker/u16:0+events_unbound	22:13:14	4
3413618	99	24	22,1	cyclictest	4011871	-21	ssh	23:35:14	7
3413618	99	24	22,1	cyclictest	4011871	-21	ssh	23:35:14	7
3413610	99	24	22,2	cyclictest	3625216	-21	kworker/u16:2+flush-8:0	21:49:38	4
3413610	99	24	20,3	cyclictest	4099937	-21	cat	00:14:43	4
3666900	2	23	0,0	chrt	0	-21	swapper/6	21:15:04	6
3413618	99	23	22,0	cyclictest	0	-21	swapper/7	20:20:17	7
3413612	99	23	21,2	cyclictest	3808419	-21	kworker/u16:3+flush-8:0	23:09:49	5
3413610	99	23	21,2	cyclictest	3611170	-21	kworker/u16:1+events_unbound	21:25:54	4
3413610	99	23	21,2	cyclictest	3611170	-21	kworker/u16:1+events_unbound	21:25:54	4
3413618	99	22	21,0	cyclictest	0	-21	swapper/7	19:55:18	7
3413612	99	22	17,4	cyclictest	3878788	-21	kworker/u16:0+flush-8:0	22:54:43	5
3413618	99	21	16,4	cyclictest	4039282	-21	ssh	23:49:43	7
3413618	99	21	15,5	cyclictest	648	-21	systemd-journal	21:39:43	7
3413615	99	21	19,2	cyclictest	4063042	-21	kworker/u16:1+events_unbound	00:23:54	6
3413615	99	21	19,2	cyclictest	3941880	-21	kworker/u16:4+events_unbound	23:29:37	6
3413615	99	21	19,2	cyclictest	3659361	-21	kworker/u16:0+events_unbound	21:26:06	6
3413615	99	21	19,2	cyclictest	3659361	-21	kworker/u16:0+events_unbound	21:26:06	6
3413615	99	21	17,3	cyclictest	3723332	-21	cat	21:39:43	6
3413612	99	21	19,2	cyclictest	4039411	-21	kworker/u16:0+flush-8:0	23:49:49	5
3413610	99	21	19,2	cyclictest	3773172	-21	kworker/u16:0+events_unbound	22:08:54	4
3413610	99	21	19,2	cyclictest	3625216	-21	kworker/u16:2+flush-8:0	21:14:54	4
3413610	99	21	19,2	cyclictest	3611170	-21	kworker/u16:1+events_unbound	21:57:55	4
3413610	99	21	19,2	cyclictest	3534115	-21	kworker/u16:0+flush-8:0	20:59:38	4
3413615	99	20	18,2	cyclictest	3625216	-21	kworker/u16:2+events_unbound	22:53:49	6
3413612	99	20	18,2	cyclictest	3808419	-21	kworker/u16:3+flush-8:0	22:44:38	5
3413610	99	20	18,2	cyclictest	3941880	-21	kworker/u16:4+events_unbound	23:19:37	4
3413610	99	20	18,2	cyclictest	3808419	-21	kworker/u16:3+events_unbound	23:10:49	4
3413610	99	20	18,2	cyclictest	3808419	-21	kworker/u16:3+events_unbound	22:51:59	4
3413610	99	20	18,2	cyclictest	3808419	-21	kworker/u16:3+events_unbound	00:06:25	4
3413610	99	20	18,2	cyclictest	3659361	-21	kworker/u16:0+events_unbound	21:35:58	4
3413610	99	20	18,2	cyclictest	3611170	-21	kworker/u16:1+events_unbound	22:21:59	4
3413610	99	20	18,2	cyclictest	3443623	-21	kworker/u16:3+events_unbound	19:25:14	4
3413618	99	19	15,3	cyclictest	3437980	-21	iostat_ios	19:19:59	7
3413618	99	19	15,3	cyclictest	3437980	-21	iostat_ios	19:19:59	7
3413618	99	19	15,3	cyclictest	1302	-21	snmpd	19:29:26	7
3413615	99	19	17,2	cyclictest	3941880	-21	kworker/u16:4+events_unbound	23:20:49	6
3413615	99	19	17,2	cyclictest	3917558	-21	kworker/u16:1+events_unbound	23:04:47	6
3413615	99	19	17,2	cyclictest	3611170	-21	kworker/u16:1+events_unbound	22:32:29	6
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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