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2026-08-23 - 15:13

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, 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 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 rackcslot7s.osadl.org (updated Sun Aug 23, 2026 00:44:45)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
100379521370,3sleep2917620-21cyclictest23:15:012
96770921360,2sleep10-21swapper/121:30:171
91675529743,21sleep30-21swapper/319:05:243
91598027243,20sleep20-21swapper/219:05:072
91737426942,18sleep00-21swapper/019:08:550
91744226343,13sleep10-21swapper/119:09:481
9268222490,4sleep1251rcuc/119:35:011
9759802430,3sleep13056-21PK-Backend21:55:111
9197002410,3sleep30-21swapper/319:15:023
9452612370,3sleep20-21swapper/220:25:192
9847322340,2sleep00-21swapper/022:20:010
9348862280,4chrt3056-21PK-Backend19:55:171
91762799281,9cyclictest970568-21chrt21:40:110
91763699251,15cyclictest984682-21sh22:20:013
917632992512,10cyclictest883-21dbus-daemon20:33:562
91762799252,8cyclictest1009234-21apt23:30:120
917627992511,5cyclictest13-21ksoftirqd/023:25:110
91762799250,24cyclictest0-21swapper/000:31:420
91763299249,11cyclictest886-21NetworkManager22:48:482
917632992415,6cyclictest28650irq/123-ahci[0019:50:212
91763699232,18cyclictest974892-21python321:50:213
91763699230,22cyclictest0-21swapper/300:13:353
917632992316,4cyclictest2174-21JS10:27:482
917632992316,4cyclictest2174-21JS10:27:482
917632992315,6cyclictest1026059-21sshd00:16:562
917632992311,9cyclictest883-21dbus-daemon23:40:002
917627992316,1cyclictest0-21swapper/021:02:420
917632992220,1cyclictest0-21swapper/222:21:392
917632992220,1cyclictest0-21swapper/220:38:042
917632992219,2cyclictest0-21swapper/221:50:022
917632992211,9cyclictest34-21ksoftirqd/220:20:002
91763299220,3cyclictest940088-21ntp_states20:10:192
917630992214,6cyclictest972349-21cpuspeed21:45:121
91763099220,20cyclictest3056-21PK-Backend22:42:581
917627992220,1cyclictest0-21swapper/020:10:020
917627992220,1cyclictest0-21swapper/019:26:430
917627992210,10cyclictest932651-21kernelversion19:50:170
91762799220,11cyclictest1030045-21cron00:30:000
917636992119,1cyclictest0-21swapper/300:08:573
917636992112,7cyclictest1-21systemd21:08:463
91763699210,20cyclictest3056-21PK-Backend22:25:213
91763299217,11cyclictest886-21NetworkManager21:08:472
917632992119,1cyclictest0-21swapper/223:25:552
917632992119,1cyclictest0-21swapper/222:40:452
917632992119,1cyclictest0-21swapper/222:12:202
917632992119,1cyclictest0-21swapper/221:59:292
917632992119,1cyclictest0-21swapper/221:41:522
917632992119,1cyclictest0-21swapper/221:35:162
917632992119,1cyclictest0-21swapper/221:35:162
917632992119,1cyclictest0-21swapper/220:06:412
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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