OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #4

Rack #0/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #1/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #2/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #3/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #4/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #5/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #6/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #7/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #8/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #9/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #a/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #b/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #c/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #d/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #e/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #f/#0 #1 #2 #3 #4 #5 #6 #7 #8
Special All - All RT - Optimization - Ethernet - Thumbnails - Next

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.

Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: ondemand
Compare latency of primary with shadow system

Characteristics of the 100 highest latencies:

System rack5slot4s.osadl.org (updated Sat Jun 27, 2026 12:44:19)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
1570810	2	344	0,3	sleep3	75	-21	kworker/3:1+events	08:00:24	3
1516890	2	180	0,5	sleep3	45	1	irq_work/3	07:05:33	3
1684845	2	98	0,1	sleep1	1684851	-21	tr	09:55:22	1
1631931	2	91	0,2	chrt	0	-21	swapper/0	09:00:23	0
1517706	99	64	59,4	cyclictest	1658138	-21	kworker/u8:1+events_unbound	10:15:33	1
1517700	99	59	50,6	cyclictest	1668452	-21	latency_hist	09:40:00	0
1517700	99	55	47,6	cyclictest	1629042	-21	kworker/u8:0+flush-8:0	09:10:32	0
1517706	99	53	47,5	cyclictest	1718705	-21	kworker/u8:2+flush-8:0	11:00:30	1
1517706	99	52	47,4	cyclictest	1742441	-21	kworker/u8:0+flush-8:0	11:05:35	1
1517706	99	52	47,4	cyclictest	1658138	-21	kworker/u8:1+flush-8:0	10:10:30	1
1517706	99	52	38,11	cyclictest	1704890	-21	systemd-journal	10:06:27	1
1517706	99	50	44,4	cyclictest	1466061	-21	kworker/u8:2+flush-8:0	07:25:26	1
1517706	99	50	43,5	cyclictest	1658138	-21	kworker/u8:1+flush-8:0	10:35:18	1
1517708	99	49	38,9	cyclictest	1704890	-21	systemd-journal	12:15:27	2
1517706	99	49	43,4	cyclictest	1629042	-21	kworker/u8:0+flush-8:0	09:15:31	1
1517706	99	49	43,4	cyclictest	1584000	-21	latency_hist	08:15:01	1
1517706	99	49	43,4	cyclictest	1584000	-21	latency_hist	08:15:00	1
1517706	99	49	38,8	cyclictest	1704890	-21	systemd-journal	09:33:27	1
1517700	99	49	40,7	cyclictest	1847971	-21	cp	12:40:00	0
1517706	99	48	44,3	cyclictest	1475054	-21	kworker/u8:3+events_unbound	08:15:34	1
1517706	99	48	44,3	cyclictest	1475054	-21	kworker/u8:3+events_unbound	08:15:34	1
1517706	99	48	41,6	cyclictest	1718705	-21	kworker/u8:2+flush-8:0	10:55:32	1
1517706	99	48	41,4	cyclictest	1658138	-21	kworker/u8:1+events_unbound	10:50:23	1
1517700	99	48	39,6	cyclictest	1797258	-21	ntpq	11:45:26	0
1517708	99	47	43,3	cyclictest	1546112	-21	kworker/u8:0+flush-8:0	07:40:31	2
1517706	99	47	41,5	cyclictest	1792373	-21	kworker/u8:0+events_unbound	12:20:33	1
1517706	99	47	41,4	cyclictest	1792261	-21	ntpq	11:40:27	1
1517706	99	47	41,4	cyclictest	1748473	-21	kworker/u8:3+events_unbound	12:00:34	1
1517706	99	47	32,10	cyclictest	1704890	-21	systemd-journal	07:11:25	1
1517708	99	46	37,7	cyclictest	1579051	-21	/usr/sbin/munin	08:10:00	2
1517706	99	46	40,5	cyclictest	1718705	-21	kworker/u8:2+events_unbound	10:30:30	1
1517706	99	46	38,5	cyclictest	1629042	-21	kworker/u8:0+events_unbound	09:10:29	1
1517706	99	46	37,7	cyclictest	1843139	-21	/usr/sbin/munin	12:35:28	1
1517706	99	46	37,6	cyclictest	1613069	-21	ntpq	08:40:29	1
1517700	99	46	37,6	cyclictest	1738361	-21	latency_hist	10:50:01	0
1517708	99	45	38,5	cyclictest	1792373	-21	kworker/u8:0+flush-8:0	12:00:32	2
1517706	99	45	38,5	cyclictest	1629042	-21	kworker/u8:0+flush-8:0	09:05:29	1
1517706	99	45	36,7	cyclictest	1658138	-21	kworker/u8:1+flush-8:0	09:45:29	1
1517706	99	45	30,11	cyclictest	1704890	-21	systemd-journal	08:00:00	1
1517700	99	45	37,6	cyclictest	1683793	-21	/usr/sbin/munin	09:55:33	0
1517700	99	43	37,4	cyclictest	1723662	-21	apt-get	10:35:14	0
1517700	99	43	35,5	cyclictest	1763140	-21	latency_hist	11:15:01	0
1517700	99	43	35,5	cyclictest	1763140	-21	latency_hist	11:15:00	0
1517706	99	42	35,5	cyclictest	1522562	-21	kworker/u8:1+flush-8:0	07:40:34	1
1517706	99	42	35,5	cyclictest	1475054	-21	kworker/u8:3+flush-8:0	10:25:32	1
1517700	99	42	35,5	cyclictest	1466061	-21	kworker/u8:2+flush-8:0	07:30:29	0
1517700	99	42	34,6	cyclictest	1475054	-21	kworker/u8:3+flush-8:0	09:40:31	0
1517700	99	42	34,5	cyclictest	1704890	-21	systemd-journal	12:35:01	0
1517706	99	41	35,4	cyclictest	1837260	-21	kworker/u8:3+events_unbound	12:30:31	1
1517706	99	41	34,5	cyclictest	1658138	-21	kworker/u8:1+events_unbound	09:50:17	1
1517700	99	41	37,3	cyclictest	1792373	-21	kworker/u8:0+flush-8:0	11:55:32	0
1517708	99	40	35,4	cyclictest	1475054	-21	kworker/u8:3+flush-8:0	07:20:01	2
1517706	99	40	35,3	cyclictest	1466061	-21	kworker/u8:2+events_unbound	07:15:32	1
1517706	99	40	32,6	cyclictest	1599077	-21	kworker/u8:2+flush-8:0	08:55:31	1
1517700	99	40	33,4	cyclictest	1658138	-21	kworker/u8:1+flush-8:0	10:20:31	0
1517706	99	39	34,4	cyclictest	1748473	-21	kworker/u8:3+flush-8:0	11:45:31	1
1517376	2	39	4,6	sleep1	0	-21	swapper/1	07:08:13	1
1517706	99	38	32,4	cyclictest	1792373	-21	kworker/u8:0+events_unbound	12:15:28	1
1517706	99	38	29,6	cyclictest	1704890	-21	systemd-journal	08:39:26	1
1517700	99	38	26,9	cyclictest	1704890	-21	systemd-journal	12:25:26	0
1517708	99	37	31,4	cyclictest	1792373	-21	kworker/u8:0+flush-8:0	12:10:31	2
1517706	99	37	31,4	cyclictest	1704890	-21	systemd-journal	12:13:27	1
1517706	99	37	30,5	cyclictest	1522562	-21	kworker/u8:1+events_unbound	08:30:27	1
1517700	99	37	33,3	cyclictest	1778228	-21	apt-key	11:30:01	0
1517700	99	37	33,3	cyclictest	1778228	-21	apt-key	11:30:01	0
1517700	99	37	23,4	cyclictest	1649236	-21	fschecks_time	09:20:19	0
1517706	99	36	31,3	cyclictest	1748473	-21	kworker/u8:3+events_unbound	11:50:27	1
1517706	99	36	31,3	cyclictest	1475054	-21	kworker/u8:3+events_unbound	09:20:31	1
1517706	99	36	30,4	cyclictest	1475054	-21	kworker/u8:3+flush-8:0	10:00:29	1
1517700	99	36	31,3	cyclictest	1466061	-21	kworker/u8:2+events_unbound	07:15:02	0
1517700	99	36	28,6	cyclictest	1704890	-21	systemd-journal	08:05:00	0
1517700	99	36	21,13	cyclictest	1579662	-21	fschecks_time	08:10:18	0
1517700	99	36	21,13	cyclictest	1579662	-21	fschecks_time	08:10:18	0
1517708	99	35	25,8	cyclictest	1704890	-21	systemd-journal	09:15:01	2
1517706	99	35	30,4	cyclictest	1522562	-21	kworker/u8:1+events_unbound	07:45:29	1
1517706	99	35	24,8	cyclictest	1704890	-21	systemd-journal	11:40:00	1
1517700	99	35	30,4	cyclictest	1792373	-21	kworker/u8:0+flush-8:0	12:20:24	0
1517700	99	35	22,11	cyclictest	1689120	-21	fschecks_time	10:00:19	0
1517700	99	35	21,12	cyclictest	1743886	-21	fschecks_time	10:55:19	0
1517700	99	35	20,13	cyclictest	1719055	-21	fschecks_time	10:30:21	0
1517708	99	34	27,5	cyclictest	1704890	-21	systemd-journal	08:40:01	2
1517708	99	34	23,8	cyclictest	1592980	-21	ntpq	08:20:28	2
1517708	99	34	23,8	cyclictest	1592980	-21	ntpq	08:20:27	2
1517706	99	34	28,5	cyclictest	1629042	-21	kworker/u8:0+events_unbound	09:25:29	1
1517706	99	34	28,5	cyclictest	1475054	-21	kworker/u8:3+events_unbound	09:40:29	1
1517706	99	34	26,5	cyclictest	1704890	-21	systemd-journal	08:21:25	1
1517706	99	34	26,5	cyclictest	1704890	-21	systemd-journal	08:21:25	1
1517706	99	34	21,9	cyclictest	1704890	-21	systemd-journal	10:44:27	1
1517700	99	34	30,3	cyclictest	1475054	-21	kworker/u8:3+flush-8:0	08:15:32	0
1517700	99	34	30,3	cyclictest	1475054	-21	kworker/u8:3+flush-8:0	08:15:32	0
1517700	99	34	27,5	cyclictest	1569079	-21	cron	07:59:59	0
1517700	99	34	24,8	cyclictest	1614568	-21	fschecks_time	08:45:19	0
1517404	2	34	4,9	sleep2	0	-21	swapper/2	07:08:35	2
1517706	99	33	28,3	cyclictest	1812228	-21	kworker/u8:1+flush-8:0	12:25:23	1
1517706	99	33	27,4	cyclictest	1475054	-21	kworker/u8:3+events_unbound	08:00:30	1
1517706	99	33	17,11	cyclictest	1704890	-21	systemd-journal	12:09:25	1
1517700	99	33	27,4	cyclictest	1718438	-21	turbostat.cron	10:29:59	0
1517700	99	33	26,5	cyclictest	1822997	-21	latency_hist	12:15:02	0
1517700	99	33	26,5	cyclictest	1658138	-21	kworker/u8:1+flush-8:0	11:35:36	0
1517700	99	32	27,3	cyclictest	1718705	-21	kworker/u8:2+flush-8:0	10:52:58	0
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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