OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, slot #7

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
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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 rack7slot7s.osadl.org (updated Wed Jan 07, 2026 12:43:46)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
4212	2	101	79,17	sleep1	0	-21	swapper/1	07:05:23	1
4834	2	94	80,9	sleep0	0	-21	swapper/0	07:08:52	0
4597	2	94	64,9	sleep2	0	-21	swapper/2	07:05:48	2
4648	2	86	73,9	sleep3	0	-21	swapper/3	07:06:29	3
4996	99	19	17,1	cyclictest	0	-21	swapper/1	09:00:14	1
4995	99	19	0,15	cyclictest	0	-21	swapper/0	08:30:13	0
4996	99	18	18,0	cyclictest	0	-21	swapper/1	07:30:15	1
4996	99	17	0,1	cyclictest	0	-21	swapper/1	10:25:13	1
5005	99	16	0,12	cyclictest	0	-21	swapper/3	07:50:14	3
5000	99	16	0,1	cyclictest	14	1	rcu_preempt	10:05:23	2
4996	99	16	14,1	cyclictest	0	-21	swapper/1	07:45:11	1
4996	99	16	1,2	cyclictest	0	-21	swapper/1	08:55:13	1
4996	99	16	0,1	cyclictest	0	-21	swapper/1	10:00:01	1
4996	99	15	2,12	cyclictest	16910	-21	grep	09:50:00	1
4995	99	15	0,8	cyclictest	14718	-21	idleruntime-cro	07:30:00	0
5005	99	14	6,3	cyclictest	30308	-21	apt-get	09:10:14	3
5005	99	14	10,3	cyclictest	7350	-21	cron	09:30:00	3
5005	99	14	10,3	cyclictest	1774	-21	cut	10:25:14	3
5005	99	14	0,13	cyclictest	15671	-21	cron	08:39:59	3
5000	99	14	11,2	cyclictest	32	-21	ksoftirqd/2	09:15:00	2
5000	99	14	1,12	cyclictest	10387	-21	/usr/sbin/munin	11:50:14	2
5000	99	14	0,13	cyclictest	0	-21	swapper/2	08:15:16	2
4996	99	14	11,2	cyclictest	0	-21	swapper/1	10:10:18	1
4996	99	14	11,2	cyclictest	0	-21	swapper/1	09:10:16	1
4996	99	14	10,3	cyclictest	7771	-21	cron	11:45:01	1
4996	99	14	10,3	cyclictest	23821	-21	tr	11:10:16	1
4996	99	14	10,2	cyclictest	19920	-21	grep	11:00:20	1
4995	99	14	11,2	cyclictest	0	-21	swapper/0	09:45:11	0
5005	99	13	9,3	cyclictest	15771	-21	cut	07:30:18	3
5005	99	13	9,3	cyclictest	1398	-21	cron	10:25:01	3
5005	99	13	9,3	cyclictest	1353	-21	cat	09:15:21	3
5005	99	13	9,2	cyclictest	29605	-21	grep	08:00:16	3
5005	99	13	10,2	cyclictest	25303	-21	grep	10:05:20	3
5005	99	13	10,2	cyclictest	10036	-21	tr	09:35:14	3
5000	99	13	6,6	cyclictest	0	-21	swapper/2	08:35:13	2
5000	99	13	11,1	cyclictest	10604	-21	ls	10:40:25	2
5000	99	13	10,2	cyclictest	8936	-21	grep	07:15:21	2
5000	99	13	10,2	cyclictest	30242	-21	grep	12:30:16	2
5000	99	13	0,12	cyclictest	28480	-21	wc	07:55:27	2
4996	99	13	9,2	cyclictest	31030	-21	grep	08:00:26	1
4996	99	13	7,5	cyclictest	28005	-21	cut	09:05:14	1
4996	99	13	6,6	cyclictest	5974	-21	tail	07:10:18	1
4996	99	13	10,2	cyclictest	9921	-21	grep	08:25:19	1
4996	99	13	10,2	cyclictest	9795	-21	sed	10:40:16	1
4996	99	13	10,2	cyclictest	7905	-21	cut	07:15:15	1
4996	99	13	10,2	cyclictest	32297	-21	ls	11:25:26	1
4996	99	13	10,2	cyclictest	27422	-21	tr	12:25:14	1
4996	99	13	10,2	cyclictest	26249	-21	wc	12:20:25	1
4996	99	13	10,2	cyclictest	17634	-21	grep	08:40:27	1
4996	99	13	10,2	cyclictest	13537	-21	grep	11:55:18	1
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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