OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of system in rack #e, slot #6

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 rackeslot6.osadl.org (updated Tue Aug 04, 2026 12:44:52)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
4080323	99	130	119,7	cyclictest	4177407	-21	latency_hist	12:10:01	1
4080323	99	126	116,7	cyclictest	4137340	-21	latency_hist	10:05:01	1
4080320	99	126	118,6	cyclictest	4125965	-21	kworker/u8:3+events_unbound	09:45:01	0
4080323	99	125	108,15	cyclictest	4094828	-21	kworker/u8:2+flush-179:0	08:00:00	1
4080320	99	124	118,4	cyclictest	4138359	-21	kworker/u8:1+flush-179:0	10:15:18	0
4080320	99	124	111,10	cyclictest	4150339	-21	latency_hist	10:45:01	0
4080320	99	123	115,6	cyclictest	4125965	-21	kworker/u8:3+events_unbound	09:40:01	0
4080323	99	117	110,5	cyclictest	4096447	-21	apt-get	08:00:02	1
4080320	99	117	111,4	cyclictest	4143224	-21	kworker/u8:0+events_unbound	10:50:00	0
4080320	99	116	108,5	cyclictest	4096530	-21	kworker/u8:3+events_unbound	08:25:01	0
4080320	99	115	107,6	cyclictest	4086584	-21	kworker/u8:0+flush-179:0	07:30:24	0
4080323	99	114	104,7	cyclictest	4124343	-21	latency_hist	09:25:01	1
4080323	99	114	102,10	cyclictest	4114702	-21	/usr/sbin/munin	08:55:24	1
4080320	99	114	105,7	cyclictest	4117125	-21	kworker/u8:2+flush-179:0	09:15:02	0
4080320	99	114	105,6	cyclictest	4109744	-21	kworker/u8:0+events_unbound	09:35:00	0
4080320	99	112	1,108	cyclictest	1	-21	systemd	08:40:00	0
4080323	99	109	97,9	cyclictest	4175821	-21	latency_hist	12:05:00	1
4080320	99	109	102,5	cyclictest	4084977	-21	kworker/u8:3+events_unbound	07:25:25	0
4080320	99	109	101,6	cyclictest	4109744	-21	kworker/u8:0+events_unbound	09:24:59	0
4080320	99	107	97,6	cyclictest	4171031	-21	kworker/u8:3+flush-179:0	12:00:21	0
4080320	99	107	90,13	cyclictest	1213033	-21	systemd-journal	10:15:00	0
4080320	99	107	100,5	cyclictest	4147124	-21	kworker/u8:3+flush-179:0	10:55:23	0
4080320	99	106	95,8	cyclictest	4095093	-21	apt-get	07:55:13	0
4080320	99	105	98,4	cyclictest	4143224	-21	kworker/u8:0+flush-179:0	11:00:21	0
4080320	99	105	97,6	cyclictest	4075719	-21	kworker/u8:0+flush-179:0	07:15:01	0
4080320	99	105	95,7	cyclictest	4075719	-21	kworker/u8:0+flush-179:0	07:20:00	0
4080320	99	104	95,7	cyclictest	4143224	-21	kworker/u8:0+events_unbound	10:30:01	0
4080320	99	103	86,6	cyclictest	4143224	-21	kworker/u8:0+events_unbound	10:35:01	0
4080320	99	103	86,6	cyclictest	4143224	-21	kworker/u8:0+events_unbound	10:35:01	0
4080320	99	102	96,4	cyclictest	4125965	-21	kworker/u8:3+events_unbound	10:05:23	0
4080320	99	101	92,6	cyclictest	4171023	-21	kworker/u8:0+flush-179:0	12:10:02	0
4080323	99	100	90,7	cyclictest	4114463	-21	latency_hist	08:55:02	1
4080323	99	100	90,7	cyclictest	4114463	-21	latency_hist	08:55:01	1
4080323	99	100	86,12	cyclictest	4130721	-21	apt-get	09:45:00	1
4080323	99	98	88,6	cyclictest	4094828	-21	kworker/u8:2+flush-179:0	07:55:01	1
4080323	99	97	89,6	cyclictest	4108353	-21	apt-get	08:35:12	1
4080320	99	97	91,4	cyclictest	4086584	-21	kworker/u8:0+flush-179:0	07:50:16	0
4080320	99	97	88,6	cyclictest	4171031	-21	kworker/u8:3+events_unbound	12:15:15	0
4080320	99	97	88,5	cyclictest	4109744	-21	kworker/u8:0+events_unbound	08:50:02	0
4080320	99	97	86,9	cyclictest	4119248	-21	apt-get	09:06:00	0
4080320	99	97	84,9	cyclictest	1213033	-21	systemd-journal	08:15:01	0
4080320	99	96	86,6	cyclictest	4096530	-21	kworker/u8:3+flush-179:0	08:30:27	0
4080320	99	96	84,9	cyclictest	4117125	-21	kworker/u8:2+events_unbound	09:05:00	0
4080323	99	94	83,8	cyclictest	4180846	-21	latency_hist	12:20:01	1
4080320	99	94	88,4	cyclictest	4109744	-21	kworker/u8:0+events_unbound	09:55:26	0
4080320	99	93	85,5	cyclictest	4171023	-21	kworker/u8:0+events_unbound	11:55:15	0
4080320	99	93	83,6	cyclictest	4125965	-21	kworker/u8:3+flush-179:0	09:45:21	0
4080320	99	93	81,8	cyclictest	4084977	-21	kworker/u8:3+flush-179:0	07:35:16	0
4080323	99	92	85,5	cyclictest	4075719	-21	kworker/u8:0+flush-179:0	07:15:25	1
4080323	99	92	84,5	cyclictest	4161458	-21	kworker/u8:0+flush-179:0	11:35:18	1
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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This page was last modified on 2020-10-04 - 12:21