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2026-04-14 - 22:45

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, slot #3

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 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: performance
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack7slot3s.osadl.org (updated Tue Apr 14, 2026 12:43:36)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1608921130,5sleep11316099cyclictest20:56:001
1545221100,4sleep231-21ksoftirqd/218:06:002
2433221050,2sleep024333-21basename21:05:570
324852930,1sleep30-21swapper/321:54:403
171872900,6sleep21316199cyclictest18:10:592
86232870,2sleep30-21swapper/320:07:063
207132780,2sleep00-21swapper/021:40:440
207132780,2sleep00-21swapper/021:40:440
317632770,5sleep21316199cyclictest19:17:012
1315999774,9cyclictest9-21ksoftirqd/019:25:540
256542720,2sleep00-21swapper/018:31:140
1315999646,12cyclictest28810-21cut21:11:000
322742620,1sleep10-21swapper/121:54:181
228202620,1sleep30-21swapper/319:46:013
13159996232,10cyclictest101ktimersoftd/021:45:540
1315999603,31cyclictest11387-21unixbench_singl19:31:120
1315999603,31cyclictest11387-21unixbench_singl19:31:120
1315999602,32cyclictest31456-21kworker/u8:220:55:590
13159995915,9cyclictest0-21swapper/021:25:570
1315999586,12cyclictest0-21swapper/020:45:580
1315999577,17cyclictest61-21kswapd021:55:560
13159995738,6cyclictest101ktimersoftd/018:16:120
13159995738,6cyclictest101ktimersoftd/018:16:120
1315999571,31cyclictest9-21ksoftirqd/017:41:010
13159995636,4cyclictest7950irq/56-dwc_otg_21:30:540
13159995636,4cyclictest0-21swapper/020:25:540
1315999562,50cyclictest3226-21latency_hist20:40:440
1315999562,50cyclictest3226-21latency_hist20:40:440
1315999561,52cyclictest3267-21cat20:01:040
1316099552,27cyclictest19269-21ssh20:20:551
13159995527,5cyclictest16572-21idleruntime-cro16:40:430
13159995526,7cyclictest5451-21unixbench_multi17:36:120
1315999552,31cyclictest4025-21idleruntime-cro21:20:430
1315999551,42cyclictest21474-21ls19:05:430
45672540,5sleep31316299cyclictest19:23:503
1316199541,19cyclictest0-21swapper/220:50:562
1316099542,7cyclictest23-21ksoftirqd/116:50:541
13159995417,14cyclictest20270-21latency_hist16:50:430
1315999541,37cyclictest0-21swapper/019:00:430
1315999541,33cyclictest22913-21unixbench_multi19:06:120
13159995411,23cyclictest0-21swapper/020:19:090
1315999539,5cyclictest0-21swapper/019:35:560
1315999532,29cyclictest0-21swapper/016:51:100
1315999531,5cyclictest1794-21/usr/sbin/munin19:21:000
1315999531,28cyclictest11790-21ssh20:11:070
1315999531,17cyclictest5181-21/usr/sbin/munin18:46:020
1315999531,17cyclictest5181-21/usr/sbin/munin18:46:020
13159995229,4cyclictest0-21swapper/021:45:430
13159995227,4cyclictest0-21swapper/018:25:560
13159995222,16cyclictest0-21swapper/017:50:430
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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