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 Thu Nov 20, 2025 00:43:33)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
3990868	2	59	48,7	sleep5	0	-21	swapper/5	03:18:45	5
3990868	2	59	48,7	sleep5	0	-21	swapper/5	03:18:45	5
4000903	99	55	50,4	cyclictest	200216	-21	latency_hist	07:13:41	7
4000901	99	53	49,3	cyclictest	109414	-21	kworker/u16:4+flush-8:0	06:38:41	6
4000478	2	52	18,30	sleep7	0	-21	swapper/7	03:23:04	7
4000478	2	52	18,30	sleep7	0	-21	swapper/7	03:23:04	7
4000900	99	49	46,3	cyclictest	290808	-21	kworker/u16:3+flush-8:0	08:48:40	5
4000901	99	46	42,3	cyclictest	109414	-21	kworker/u16:4+flush-8:0	07:03:41	6
4000900	99	44	42,2	cyclictest	4049775	-21	kworker/u16:1+flush-8:0	04:38:41	5
4000901	99	40	37,2	cyclictest	109414	-21	kworker/u16:4+events_unbound	07:53:51	6
4000221	2	40	30,7	sleep4	0	-21	swapper/4	03:19:24	4
4000221	2	40	30,7	sleep4	0	-21	swapper/4	03:19:24	4
4000900	99	39	37,2	cyclictest	4171469	-21	kworker/u16:3+flush-8:0	06:24:11	5
4000903	99	37	0,35	cyclictest	589235	-21	systemd-journal	04:53:41	7
4000900	99	37	35,2	cyclictest	4171717	-21	kworker/u16:5+flush-8:0	05:31:19	5
4000903	99	36	31,4	cyclictest	4008359	-21	latency_hist	03:48:41	7
4000903	99	36	29,6	cyclictest	589235	-21	systemd-journal	07:08:15	7
4000900	99	36	34,2	cyclictest	4160898	-21	kworker/u16:0+flush-8:0	06:21:17	5
4000900	99	36	33,2	cyclictest	321118	-21	kworker/u16:1+events_unbound	08:48:50	5
4000903	99	35	28,5	cyclictest	17965	-21	latency_hist	05:43:41	7
4000900	99	35	33,2	cyclictest	3290230	-21	kworker/u16:4+flush-8:0	04:29:19	5
3990869	2	35	25,7	sleep6	0	-21	swapper/6	03:18:46	6
3990869	2	35	25,7	sleep6	0	-21	swapper/6	03:18:46	6
4000900	99	34	32,2	cyclictest	4171469	-21	kworker/u16:3+flush-8:0	07:09:51	5
4000900	99	34	32,2	cyclictest	109414	-21	kworker/u16:4+events_unbound	06:33:51	5
4000900	99	33	31,2	cyclictest	4171717	-21	kworker/u16:5+events_unbound	05:37:18	5
4000900	99	33	31,2	cyclictest	4171469	-21	kworker/u16:3+events_unbound	06:09:19	5
4000900	99	33	31,2	cyclictest	4100446	-21	kworker/u16:0+events_unbound	05:08:19	5
4000900	99	33	31,2	cyclictest	4005926	-21	kworker/u16:2+flush-8:0	03:47:51	5
4000900	99	33	31,2	cyclictest	331185	-21	kworker/u16:2+events_unbound	08:39:15	5
4000900	99	33	31,2	cyclictest	321118	-21	kworker/u16:1+flush-8:0	08:10:50	5
4000900	99	33	31,2	cyclictest	290808	-21	kworker/u16:3+events_unbound	08:01:51	5
4000900	99	33	31,2	cyclictest	109414	-21	kworker/u16:4+events_unbound	06:49:51	5
4000900	99	33	30,2	cyclictest	3978854	-21	kworker/u16:1+flush-8:0	03:33:52	5
4000900	99	33	30,2	cyclictest	3290230	-21	kworker/u16:4+events_unbound	03:57:44	5
4000900	99	32	30,2	cyclictest	4160898	-21	kworker/u16:0+flush-8:0	06:31:00	5
4000900	99	32	30,2	cyclictest	331185	-21	kworker/u16:2+events_unbound	08:36:19	5
4000900	99	32	30,2	cyclictest	28825	-21	kworker/u16:2+events_unbound	05:49:10	5
4000900	99	32	30,2	cyclictest	109414	-21	kworker/u16:4+events_unbound	06:46:27	5
4000896	99	32	28,3	cyclictest	4171717	-21	kworker/u16:5+events_unbound	05:39:00	4
4000903	99	31	26,4	cyclictest	68815	-21	latency_hist	06:08:41	7
4000901	99	31	28,2	cyclictest	4160898	-21	kworker/u16:0+flush-8:0	06:03:40	6
4000900	99	31	29,2	cyclictest	4171469	-21	kworker/u16:3+flush-8:0	07:06:51	5
4000900	99	31	29,2	cyclictest	4171469	-21	kworker/u16:3+events_unbound	05:40:59	5
4000900	99	31	29,2	cyclictest	4110718	-21	kworker/u16:4+flush-8:0	04:57:19	5
4000900	99	31	29,2	cyclictest	3978854	-21	kworker/u16:1+events_unbound	03:33:03	5
4000900	99	31	29,2	cyclictest	331185	-21	kworker/u16:2+flush-8:0	08:19:19	5
4000900	99	31	29,2	cyclictest	331185	-21	kworker/u16:2+flush-8:0	08:17:26	5
4000900	99	31	29,2	cyclictest	3290230	-21	kworker/u16:4+events_unbound	03:25:45	5
4000900	99	31	29,2	cyclictest	109414	-21	kworker/u16:4+events_unbound	07:43:18	5
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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