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2026-07-07 - 23:33

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #6

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: 50 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rack4slot6s.osadl.org (updated Tue Jul 07, 2026 12:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2986622540,3sleep029869-21latency_hist11:10:010
1761522460,3sleep017613-21awk08:15:230
2675021480,3sleep026752-21switchtime08:50:260
32756214618,33sleep032757-21cron07:10:000
442321210,4chrt4422-21/usr/sbin/munin09:30:200
3112121210,2sleep031123-21cron11:15:000
974921190,3chrt9746-21ntpq07:45:210
340991197,24cyclictest22311-21cut08:35:020
3409911930,16cyclictest12737-21runrttasks12:08:510
3409911927,15cyclictest27454-21runrttasks11:00:120
3409911831,14cyclictest15880-21latency_hist08:10:010
3409911729,15cyclictest2606-21runrttasks09:23:540
3409911729,14cyclictest11480-21runrttasks12:04:040
3409911728,15cyclictest5567-21latency_hist07:30:020
3409911629,14cyclictest13552-21/usr/sbin/munin08:00:180
3409911628,16cyclictest19208-21runrttasks10:27:280
3409911627,17cyclictest17660-21runrttasks12:26:260
3409911529,12cyclictest1367-21runrttasks07:13:070
3409911525,17cyclictest25764-21runrttasks10:53:250
3409911523,15cyclictest1802-21/usr/sbin/munin11:25:250
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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