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2025-10-17 - 10:31

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 50 highest latencies:
System rack4slot6s.osadl.org (updated Fri Oct 17, 2025 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1514022440,2sleep015139-21/usr/sbin/munin19:50:260
1321021790,3sleep013211-21timerwakeupswit00:00:320
1689221390,2sleep016894-21find00:15:270
2169321380,4chrt21692-21munin-run22:30:010
1806721370,4chrt18066-21sshd20:02:380
2371221350,3sleep023711-21cpu20:25:120
274821300,3chrt2749-21ls21:10:020
628121100,4sleep06295-21irqstats23:35:180
1678721070,3sleep016636-21/usr/sbin/munin22:10:180
1441221070,4sleep014484-21sed00:05:310
91392980,3sleep09140-21sshd21:38:380
280002960,3sleep028066-21/usr/sbin/munin20:40:320
292522900,4sleep029318-21sort20:45:280
111982865,65sleep011250-21latency_hist23:55:020
133182814,8sleep013340-21users21:55:290
223132760,3sleep022385-21cat22:30:320
467527418,31sleep04702-21munin-run19:10:000
472799639,19cyclictest18479-21/usr/sbin/munin20:05:240
4727996122,13cyclictest269-21runrttasks19:35:010
4727996116,15cyclictest31689-21/usr/sbin/munin20:55:240
31482610,3sleep03149-21awk21:10:230
472799609,17cyclictest2293-21/usr/sbin/munin23:20:210
4727996026,25cyclictest32463-21/usr/sbin/munin23:10:230
472799599,15cyclictest23099-21/usr/sbin/munin22:35:300
472799598,16cyclictest30041-21runrttasks23:00:290
472799597,20cyclictest12063-21cpu19:40:130
4727995934,15cyclictest28775-21/usr/sbin/munin22:55:270
4727995910,20cyclictest9032-21ntp_states23:45:220
472799589,17cyclictest18165-21runrttasks00:20:320
472799588,17cyclictest6091-21modprobe19:15:010
472799588,16cyclictest4828-21/usr/sbin/munin19:10:160
4727995834,16cyclictest3646-21/usr/sbin/munin23:25:170
4727995834,15cyclictest27172-21/usr/sbin/munin22:50:210
4727995833,15cyclictest22663-21/usr/sbin/munin20:20:230
4727995833,14cyclictest15435-21/usr/sbin/munin22:05:180
4727995832,15cyclictest25990-21ntp_states22:45:240
4727995831,16cyclictest15877-21munin-node19:55:120
4727995817,13cyclictest14062-21/usr/sbin/munin22:00:260
4727995811,13cyclictest30407-21ntp_states20:50:260
4727995810,37cyclictest19244-21/usr/sbin/munin00:25:200
472799579,18cyclictest22189-21snmpd23:08:390
472799579,17cyclictest8148-21/usr/sbin/munin19:25:160
472799579,17cyclictest4124-21/usr/sbin/munin21:15:300
472799579,15cyclictest15209-21/usr/sbin/munin00:10:200
472799578,19cyclictest21580-21/usr/sbin/munin20:15:230
472799578,15cyclictest6854-21/usr/sbin/munin19:20:220
4727995733,15cyclictest505-21/usr/sbin/munin21:00:200
4727995714,12cyclictest20541-21latency00:30:170
472799569,17cyclictest21856-21/usr/sbin/munin00:35:220
472799567,16cyclictest9468-21/usr/sbin/munin21:40:290
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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