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2026-08-27 - 18:20

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #8

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 20 highest latencies:
System rackeslot8s.osadl.org (updated Thu Aug 27, 2026 12:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
141074221130,1sleep00-21swapper/009:20:150
12381162330,2sleep10-21swapper/107:05:241
1238732993128,1cyclictest0-21swapper/312:10:123
16947342300,4sleep21694606-21ssh12:20:192
164367122621,3sleep21643697-21/usr/sbin/munin11:49:592
15117292212,10sleep21511726-21apt-get10:25:132
1238732992118,1cyclictest0-21swapper/307:55:013
1238732991916,1cyclictest0-21swapper/308:15:003
16221542181,3sleep01623783-21tr11:35:170
123873299185,9cyclictest15021042sleep310:16:023
123873299183,11cyclictest1550290-21turbostat10:50:003
1238732991816,1cyclictest0-21swapper/309:35:223
1238732991815,1cyclictest0-21swapper/311:05:013
123873299181,14cyclictest1409412-21taskset09:18:453
123873299181,13cyclictest0-21swapper/312:25:113
16180022170,4sleep01618096-21ntpq11:30:210
15442782171,3sleep21545578-21kthreadcore10:45:182
123873299171,8cyclictest1285492-21taskset07:44:203
123873299171,7cyclictest1517650-21taskset10:25:453
123873299171,3cyclictest0-21swapper/312:30:163
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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