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2026-04-17 - 21:11

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #b, 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.

Note that this system runs a non-RT kernel.
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: performance
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rackbslot7s.osadl.org (updated Fri Apr 17, 2026 12:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
30746274714,717sleep230757-21/usr/sbin/munin09:26:342
864927366,691sleep18695-21ntpq11:41:351
864927366,691sleep18695-21ntpq11:41:351
1199626576,635sleep112029-21ntpq11:51:441
2059426366,595sleep120630-21ntpq10:36:341
2059426366,595sleep120630-21ntpq10:36:341
29615262615,592sleep229734-21/usr/sbin/munin09:21:452
29615262615,592sleep229734-21/usr/sbin/munin09:21:452
18354246783,205sleep118382-21modprobe10:31:091
72452398107,204sleep17395-21unixbench_singl08:11:421
27714237837,293sleep127735-21awk11:01:091
2111723345,316sleep215044-1kworker/2:0H08:56:292
2111723345,316sleep215044-1kworker/2:0H08:56:292
3265123047,259sleep1324-21grep09:31:421
21069227779,179sleep125884-21systemd-journal07:16:101
21069227779,179sleep125884-21systemd-journal07:16:101
670225818,221sleep2709-21ntpq07:51:362
10277225252,110sleep125884-21systemd-journal10:02:311
2910922510,7sleep10-21swapper/109:21:351
2910922510,7sleep10-21swapper/109:21:351
9091223837,107sleep19235-21latency_hist10:01:131
26229221533,144sleep126373-21latency_hist10:56:121
28324221014,182sleep028363-21irqstats07:36:320
28324221014,182sleep028363-21irqstats07:36:320
28091220611,180sleep228083-21apt07:36:262
28091220611,180sleep228083-21apt07:36:262
285892204104,79sleep10-21swapper/109:21:121
25490220024,153sleep325630-21tail07:27:463
19168219984,90sleep10-21swapper/112:16:111
12159219812,119sleep112210-21latency_hist10:11:111
12159219812,119sleep112210-21latency_hist10:11:111
1542219325,146sleep00-21swapper/007:56:100
15242219331,122sleep115386-21tail08:36:411
27231218829,120sleep127352-21ls07:32:451
26068218826,150sleep126107-21ntpq09:11:351
7896218612,159sleep07922-21proc_pri09:56:480
22377218131,58sleep10-21swapper/110:41:391
649218075,22sleep10-21swapper/107:51:351
16835216915,138sleep316853-21wc10:26:103
16835216915,138sleep316853-21wc10:26:103
1449215837,29sleep10-21swapper/109:36:341
22671215647,45sleep10-21swapper/109:01:291
1868215616,122sleep21873-21entropy11:21:292
17591215535,65sleep10-21swapper/107:06:121
17591215535,65sleep10-21swapper/107:06:121
30044215144,85sleep10-21swapper/111:06:381
1757321508,102sleep117621-21latency_hist12:11:101
2962214211,109sleep00-21swapper/009:41:340
18456214110,32sleep117-21ksoftirqd/107:06:411
18456214110,32sleep117-21ksoftirqd/107:06:411
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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