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 Sun Apr 26, 2026 00:43:33)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
3844643	2	59	47,8	sleep5	0	-21	swapper/5	19:04:20	5
3854080	99	42	36,5	cyclictest	328098	-21	latency_hist	00:09:15	7
3848291	2	40	3,30	sleep7	0	-21	swapper/7	19:04:38	7
3853576	2	36	25,8	sleep4	0	-21	swapper/4	19:06:11	4
3854080	99	35	0,33	cyclictest	304048	-21	latency_hist	23:59:15	7
3854073	99	35	33,2	cyclictest	374626	-21	kworker/u16:1+events_unbound	00:27:49	5
3854073	99	33	31,2	cyclictest	4040065	-21	kworker/u16:4+events_unbound	21:22:54	5
3854073	99	33	31,2	cyclictest	361937	-21	kworker/u16:0+events_unbound	00:22:40	5
3854069	99	33	30,2	cyclictest	4160495	-21	kworker/u16:4+flush-8:0	23:19:15	4
3854078	99	32	30,2	cyclictest	219738	-21	kworker/u16:3+flush-8:0	23:52:25	6
3854073	99	32	30,2	cyclictest	4029572	-21	kworker/u16:2+events_unbound	21:14:56	5
3854078	99	31	29,2	cyclictest	4029572	-21	kworker/u16:2+flush-8:0	20:54:15	6
3854073	99	30	28,2	cyclictest	4160495	-21	kworker/u16:4+events_unbound	22:36:00	5
3854073	99	30	28,2	cyclictest	136723	-21	kworker/u16:2+flush-8:0	22:52:53	5
3854080	99	29	28,0	cyclictest	0	-21	swapper/7	23:09:29	7
3854073	99	29	27,2	cyclictest	4160495	-21	kworker/u16:4+events_unbound	23:03:08	5
3854073	99	29	27,2	cyclictest	4145740	-21	kworker/u16:2+flush-8:0	21:39:40	5
3854073	99	29	27,2	cyclictest	39076	-21	kworker/u16:5+flush-8:0	22:13:26	5
3854073	99	29	27,2	cyclictest	39076	-21	kworker/u16:5+flush-8:0	22:13:26	5
3854073	99	29	27,2	cyclictest	374626	-21	kworker/u16:1+events_unbound	00:36:56	5
3854073	99	29	27,2	cyclictest	219738	-21	kworker/u16:3+events_unbound	00:17:12	5
3854073	99	29	27,2	cyclictest	219738	-21	kworker/u16:3+events_unbound	00:17:12	5
3854078	99	28	26,2	cyclictest	99303	-21	kworker/u16:0+flush-8:0	22:49:45	6
3854073	99	28	26,2	cyclictest	219738	-21	kworker/u16:3+events_unbound	00:05:52	5
3854073	99	28	26,2	cyclictest	136723	-21	kworker/u16:2+flush-8:0	22:57:48	5
3854073	99	28	26,2	cyclictest	136723	-21	kworker/u16:2+flush-8:0	22:57:48	5
3854073	99	28	25,2	cyclictest	4001614	-21	kworker/u16:3+events_unbound	20:29:18	5
3854078	99	27	25,2	cyclictest	3815746	-21	kworker/u16:0+events_unbound	19:14:33	6
3854073	99	27	25,2	cyclictest	99303	-21	kworker/u16:0+events_unbound	22:47:39	5
3854073	99	27	25,2	cyclictest	4124355	-21	kworker/u16:3+flush-8:0	21:26:06	5
3854073	99	27	25,2	cyclictest	4077940	-21	kworker/u16:1+flush-8:0	21:01:45	5
3854073	99	27	25,2	cyclictest	3982391	-21	kworker/u16:1+events_unbound	20:28:54	5
3854073	99	27	25,2	cyclictest	136723	-21	kworker/u16:2+flush-8:0	23:04:30	5
3854073	99	27	25,2	cyclictest	121021	-21	kworker/u16:2+flush-8:0	22:41:57	5
3854078	99	26	24,2	cyclictest	3915136	-21	kworker/u16:3+flush-8:0	19:39:38	6
3854073	99	26	24,2	cyclictest	4160495	-21	kworker/u16:4+events_unbound	22:24:57	5
3854073	99	26	24,2	cyclictest	302750	-21	kworker/u16:2+events_unbound	23:57:55	5
3854073	99	26	24,2	cyclictest	219738	-21	kworker/u16:3+flush-8:0	00:12:40	5
3854073	99	26	24,2	cyclictest	171715	-21	kworker/u16:0+events_unbound	23:45:38	5
3853654	2	26	16,7	sleep6	0	-21	swapper/6	19:07:18	6
3854080	99	25	21,3	cyclictest	3915559	-21	sed	19:39:16	7
3854078	99	25	22,2	cyclictest	4160495	-21	kworker/u16:4+flush-8:0	22:24:40	6
3854073	99	25	23,2	cyclictest	4160495	-21	kworker/u16:4+flush-8:0	23:20:28	5
3854073	99	25	23,2	cyclictest	4124355	-21	kworker/u16:3+events_unbound	21:36:22	5
3854073	99	25	23,2	cyclictest	4049855	-21	kworker/u16:0+flush-8:0	21:11:56	5
3854073	99	25	23,2	cyclictest	3943861	-21	kworker/u16:1+events_unbound	19:56:43	5
3854073	99	25	23,2	cyclictest	39075	-21	kworker/u16:1+flush-8:0	22:32:02	5
3854073	99	25	23,2	cyclictest	3853797	-21	kworker/u16:2+flush-8:0	19:29:02	5
3854073	99	25	23,2	cyclictest	243789	-21	kworker/u16:1+events_unbound	23:53:08	5
3854073	99	25	23,2	cyclictest	243789	-21	kworker/u16:1+events_unbound	00:00:49	5
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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