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 Mon Apr 20, 2026 12:43:34)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
3300441	2	64	0,1	sleep7	3300443	-21	ssh	10:05:26	7
2922150	2	55	45,7	sleep4	0	-21	swapper/4	07:06:15	4
2922349	2	45	35,7	sleep5	0	-21	swapper/5	07:09:05	5
2922695	99	44	38,5	cyclictest	3643468	-21	latency_hist	12:29:36	7
2922695	99	42	35,5	cyclictest	635	-21	systemd-journal	10:04:37	7
2922692	99	40	38,2	cyclictest	3361282	-21	kworker/u16:1+events_unbound	11:14:37	6
2922122	2	40	3,31	sleep7	0	-21	swapper/7	07:05:54	7
2922695	99	39	33,5	cyclictest	3436812	-21	latency_hist	11:04:38	7
2922690	99	36	33,2	cyclictest	3361282	-21	kworker/u16:1+flush-8:0	11:23:55	5
2922692	99	35	33,2	cyclictest	3388192	-21	kworker/u16:4+events_unbound	12:24:55	6
2922690	99	35	33,2	cyclictest	3593641	-21	kworker/u16:1+events_unbound	12:08:40	5
2922690	99	35	33,2	cyclictest	3546645	-21	kworker/u16:0+flush-8:0	12:00:55	5
2922690	99	35	33,2	cyclictest	3388192	-21	kworker/u16:4+flush-8:0	11:59:15	5
2922692	99	34	32,2	cyclictest	3593641	-21	kworker/u16:1+flush-8:0	12:30:47	6
2922690	99	34	32,2	cyclictest	3422491	-21	kworker/u16:3+events_unbound	10:56:52	5
2922690	99	34	32,2	cyclictest	3388192	-21	kworker/u16:4+flush-8:0	11:45:35	5
2922690	99	34	32,2	cyclictest	3388192	-21	kworker/u16:4+flush-8:0	11:41:40	5
2922690	99	34	32,2	cyclictest	3277310	-21	kworker/u16:2+events_unbound	10:08:03	5
2922690	99	34	32,2	cyclictest	3088576	-21	kworker/u16:2+flush-8:0	09:48:31	5
2922690	99	34	32,2	cyclictest	3088576	-21	kworker/u16:2+events_unbound	09:28:48	5
2922692	99	33	31,2	cyclictest	3628849	-21	kworker/u16:0+flush-8:0	12:37:47	6
2922692	99	33	31,2	cyclictest	3628849	-21	kworker/u16:0+flush-8:0	12:37:47	6
2922692	99	33	31,2	cyclictest	3413392	-21	kworker/u16:0+events_unbound	11:05:11	6
2922690	99	33	31,2	cyclictest	3593641	-21	kworker/u16:1+flush-8:0	12:18:32	5
2922690	99	33	31,2	cyclictest	3388192	-21	kworker/u16:4+events_unbound	11:29:19	5
2922690	99	33	31,2	cyclictest	3361282	-21	kworker/u16:1+events_unbound	11:13:56	5
2922690	99	33	31,2	cyclictest	3361282	-21	kworker/u16:1+events_unbound	11:09:19	5
2922690	99	33	31,2	cyclictest	3302338	-21	kworker/u16:0+events_unbound	10:26:47	5
2922690	99	33	31,2	cyclictest	3118539	-21	kworker/u16:0+events_unbound	09:13:41	5
2922690	99	33	31,2	cyclictest	3088576	-21	kworker/u16:2+flush-8:0	09:23:12	5
2922692	99	32	30,2	cyclictest	3361282	-21	kworker/u16:1+events_unbound	10:33:47	6
2922692	99	32	30,2	cyclictest	3361282	-21	kworker/u16:1+events_unbound	10:33:47	6
2922692	99	32	30,2	cyclictest	3239482	-21	kworker/u16:4+flush-8:0	09:43:04	6
2922692	99	32	29,2	cyclictest	3388192	-21	kworker/u16:4+events_unbound	12:04:39	6
2922690	99	32	30,2	cyclictest	3388192	-21	kworker/u16:4+flush-8:0	11:35:40	5
2922690	99	32	30,2	cyclictest	3315400	-21	kworker/u16:3+flush-8:0	10:43:08	5
2922690	99	32	30,2	cyclictest	3191969	-21	kworker/u16:0+flush-8:0	09:38:27	5
2922695	99	31	30,0	cyclictest	0	-21	swapper/7	11:55:55	7
2922690	99	31	29,2	cyclictest	3593641	-21	kworker/u16:1+flush-8:0	12:29:27	5
2922690	99	31	29,2	cyclictest	3522012	-21	kworker/u16:2+flush-8:0	12:10:59	5
2922690	99	31	29,2	cyclictest	3108744	-21	kworker/u16:1+flush-8:0	09:54:52	5
2922692	99	30	28,2	cyclictest	3375732	-21	kworker/u16:2+flush-8:0	10:39:43	6
2922692	99	30	28,2	cyclictest	3361282	-21	kworker/u16:1+flush-8:0	10:50:12	6
2922692	99	30	28,2	cyclictest	3302338	-21	kworker/u16:0+events_unbound	10:14:51	6
2922692	99	30	28,2	cyclictest	3108744	-21	kworker/u16:1+events_unbound	09:54:03	6
2922692	99	30	28,2	cyclictest	2875279	-21	kworker/u16:1+flush-8:0	07:29:32	6
2922692	99	30	27,2	cyclictest	3388192	-21	kworker/u16:4+flush-8:0	11:39:47	6
2922690	99	30	28,2	cyclictest	3643853	-21	kworker/u16:3+flush-8:0	12:38:20	5
2922690	99	30	28,2	cyclictest	3643853	-21	kworker/u16:3+flush-8:0	12:38:20	5
2922690	99	30	28,2	cyclictest	3388192	-21	kworker/u16:4+events_unbound	12:21:51	5
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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