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2025-06-24 - 19:18

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #5

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 rackeslot5s.osadl.org (updated Tue Jun 24, 2025 12:44:21)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
14121992422,1cyclictest0-21swapper/312:10:003
1411899240,23cyclictest6056-21cron12:24:592
1411899240,23cyclictest5496-21sh09:05:002
14114992423,0cyclictest0-21swapper/009:29:120
1412199230,22cyclictest1444-21grep07:50:003
14118992320,2cyclictest23694-21munin-plugin-st11:55:002
1411899230,22cyclictest32400-21lockfile-remove10:00:002
1411899230,22cyclictest2695-21apt-get09:00:002
1411899230,22cyclictest22775-21latency_hist09:40:002
1411899230,22cyclictest10825-21apt-get11:30:042
14115992321,1cyclictest6250-21idleruntime-cro08:00:001
14115992321,1cyclictest0-21swapper/110:35:001
1411599230,22cyclictest0-21swapper/111:54:151
14114992321,1cyclictest15139-21munin-run09:25:000
1411499230,22cyclictest30324-21basename08:50:000
14121992221,1cyclictest24141-21latency_hist07:30:003
14121992221,1cyclictest0-21swapper/309:59:113
14121992221,0cyclictest0-21swapper/312:14:143
1412199221,20cyclictest0-21swapper/309:19:123
1412199220,21cyclictest0-21swapper/311:40:013
1412199220,21cyclictest0-21swapper/310:24:113
1412199220,21cyclictest0-21swapper/309:44:113
1412199220,21cyclictest0-21swapper/307:35:003
14118992220,1cyclictest20709-21wc08:30:002
14118992220,1cyclictest0-21swapper/209:14:122
1411899220,21cyclictest9577-21perf10:20:002
1411899220,21cyclictest8442-21munin-run11:25:002
1411899220,21cyclictest17526-21apt-get07:19:102
1411899220,21cyclictest13303-21idleruntime-cro12:40:002
1411899220,21cyclictest10833-21perf11:30:002
1411899220,21cyclictest0-21swapper/211:59:112
1411899220,21cyclictest0-21swapper/211:49:102
14115992220,1cyclictest21296-21apt-get08:34:111
14115992220,1cyclictest18336-21munin-run08:25:011
14115992220,1cyclictest13460-21munin-run08:15:001
1411599221,20cyclictest0-21swapper/111:05:001
1411599220,21cyclictest9011-21apt-get11:29:111
1411599220,21cyclictest30547-21apt-get09:59:101
1411599220,21cyclictest19941-21apt-get07:24:111
1411599220,21cyclictest17971-21latency_hist09:30:001
1411599220,21cyclictest12726-21perf09:20:001
1411599220,21cyclictest0-21swapper/107:39:131
1411599220,1cyclictest29466-21apt-get12:09:101
14114992220,2cyclictest3624-21latency_hist11:15:000
1411499220,21cyclictest31433-21cron07:45:000
1411499220,21cyclictest28153-21apt-get09:54:110
1411499220,21cyclictest0-21swapper/010:09:120
1411499220,1cyclictest0-21swapper/009:20:000
14121992120,1cyclictest0-21swapper/312:19:133
14121992120,1cyclictest0-21swapper/307:44:133
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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