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2026-04-23 - 17:01

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, slot #2

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
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack7slot2s.osadl.org (updated Thu Apr 23, 2026 12:48:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
359403899293160,93cyclictest0-21swapper/011:37:000
359403899276140,122cyclictest3638012-21sshd11:01:510
359403899276140,122cyclictest3638012-21sshd11:01:510
359403899270157,97cyclictest716-21snmpd12:06:300
359403899270157,97cyclictest716-21snmpd12:06:300
359403899268184,53cyclictest171rcu_preempt08:51:410
359403899268184,53cyclictest171rcu_preempt08:51:410
359403899268135,86cyclictest0-21swapper/010:45:140
359403899267134,85cyclictest0-21swapper/007:16:480
359403899267126,88cyclictest3639968-21ntpq11:11:070
359403899267126,88cyclictest3639968-21ntpq11:11:070
359403899265166,87cyclictest0-21swapper/009:41:020
359403899265166,87cyclictest0-21swapper/009:41:020
359403899265146,97cyclictest3622099-21kworker/u9:15+rpciod10:05:210
359403899265142,71cyclictest0-21swapper/011:56:570
359403899265142,71cyclictest0-21swapper/011:56:570
359403899263166,51cyclictest171rcu_preempt11:09:160
359403899263146,100cyclictest0-21swapper/009:17:010
359403899262150,94cyclictest0-21swapper/010:25:020
359403899262150,94cyclictest0-21swapper/010:25:020
359403899261159,86cyclictest0-21swapper/009:56:180
359403899260148,97cyclictest439-21sendmail-mta07:11:050
359403899260148,97cyclictest439-21sendmail-mta07:11:050
359403899260142,102cyclictest1-21systemd08:00:430
359403899260142,102cyclictest1-21systemd08:00:430
359403899259147,95cyclictest0-21swapper/010:26:570
359403899259144,99cyclictest0-21swapper/007:36:580
359403899259144,99cyclictest0-21swapper/007:36:580
359403899259139,106cyclictest3613028-21sendmail_mailtr09:02:030
359403899258148,94cyclictest0-21swapper/011:15:320
359403899258148,94cyclictest0-21swapper/011:15:320
359403899257176,67cyclictest0-21swapper/009:51:510
359403899257176,67cyclictest0-21swapper/009:51:510
359403899256147,66cyclictest3649038-21latency_hist11:55:040
359403899256146,93cyclictest0-21swapper/010:55:500
359403899256146,93cyclictest0-21swapper/010:55:500
359403899255151,87cyclictest0-21swapper/010:02:040
359403899255150,92cyclictest3632199-21latency_hist10:35:030
359403899254149,90cyclictest709-21lldpd09:10:130
359403899254146,91cyclictest0-21swapper/012:11:540
359403899254145,92cyclictest0-21swapper/012:17:110
359403899254145,92cyclictest0-21swapper/012:17:110
359403899253155,84cyclictest0-21swapper/012:00:430
359403899253155,84cyclictest0-21swapper/012:00:420
359403899253144,91cyclictest3634209-21kworker/u10:10-events_unbound10:44:390
359403899252150,87cyclictest0-21swapper/011:21:230
359403899252150,87cyclictest0-21swapper/011:21:230
359403899252143,93cyclictest0-21swapper/008:30:070
359403899252125,75cyclictest171rcu_preempt08:11:280
359403899252105,101cyclictest0-21swapper/008:45:460
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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