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2025-04-03 - 15:47

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 Thu Apr 03, 2025 00:44:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
63099260,25cyclictest1-21systemd23:00:000
63499250,24cyclictest18206-21apt-get23:27:031
641992422,1cyclictest34-21ksoftirqd/320:10:013
63499240,23cyclictest25847-21apt-get20:02:071
63499240,23cyclictest20617-21latency_hist19:49:591
63799230,22cyclictest5848-21perf19:20:002
634992321,1cyclictest7868-21awk20:30:001
634992321,1cyclictest5844-21dpkg19:20:011
634992321,1cyclictest26231-21munin-run22:25:001
63499230,2cyclictest23023-21grep19:54:591
63499230,22cyclictest5458-21sh20:25:011
630992323,0cyclictest0-21swapper/023:22:000
630992321,1cyclictest13482-21apt-get20:42:080
63099230,22cyclictest14517-21sleep00:40:000
64199220,21cyclictest593-21dbus-daemon00:20:013
64199220,21cyclictest0-21swapper/323:12:073
64199220,21cyclictest0-21swapper/321:42:053
64199220,21cyclictest0-21swapper/321:22:093
64199220,21cyclictest0-21swapper/321:02:083
64199220,21cyclictest0-21swapper/320:27:063
64199220,21cyclictest0-21swapper/300:35:003
637992220,1cyclictest31710-21perf22:40:012
63799220,21cyclictest25434-21perf20:00:002
63799220,21cyclictest1727-21awk22:45:012
63799220,21cyclictest15812-21perf19:40:002
63799220,21cyclictest13347-21apt-get21:52:062
63799220,21cyclictest0-21swapper/220:47:052
63799220,21cyclictest0-21swapper/200:32:072
634992221,1cyclictest0-21swapper/123:42:051
634992220,1cyclictest31111-21cron00:00:001
63499220,2cyclictest6657-21apt-get19:22:051
63499220,21cyclictest9567-21munin-run23:05:001
63499220,21cyclictest12367-21apt-get23:12:091
63499220,1cyclictest593-21dbus-daemon22:00:011
630992220,1cyclictest593-21dbus-daemon23:19:590
630992220,1cyclictest3035-21cron20:20:010
630992220,1cyclictest25642-21munin-run23:45:000
63099220,21cyclictest23077-21apt-get21:02:090
63099220,21cyclictest0-21swapper/022:12:100
63099220,21cyclictest0-21swapper/021:52:070
63099220,21cyclictest0-21swapper/020:47:050
63099220,21cyclictest0-21swapper/019:42:070
63099220,1cyclictest30217-21sh21:15:000
641992120,1cyclictest9474-21apt-get00:27:073
641992119,1cyclictest7844-21apt-get20:30:013
641992119,1cyclictest22668-21munin-run21:00:003
64199210,21cyclictest0-21swapper/323:27:043
64199210,21cyclictest0-21swapper/300:07:053
64199210,20cyclictest3491-21apt-get20:22:073
64199210,20cyclictest30705-21apt-get21:17:063
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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