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2026-09-03 - 13:20

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #7

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: 50.5 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 rack5slot7s.osadl.org (updated Thu Sep 03, 2026 00:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
32166224292198,86sleep00-21swapper19:06:190
326279916227,115cyclictest15635-21cat00:00:060
326279916014,122cyclictest13889-21apt-get23:50:270
326279916011,122cyclictest5316-21apt-get19:41:130
326279915915,120cyclictest9117-21memory20:00:430
326279915915,105cyclictest19817-21munin-run00:25:030
326279915817,24cyclictest17043-21/usr/sbin/munin00:06:050
326279915816,116cyclictest3156-21apt-get22:45:180
326279915814,102cyclictest25804-21apt-get21:45:270
326279915716,116cyclictest24829-21munin-run21:40:020
326279915715,118cyclictest23569-21memory21:30:440
326279915713,120cyclictest17334-21apt-get00:10:270
326279915632,104cyclictest16207-21df20:45:240
326279915615,116cyclictest5321-21munin-run19:40:040
326279915613,118cyclictest19559-21memory21:05:440
326279915613,100cyclictest7160-21apt-get23:10:240
326279915516,114cyclictest25187-21memory21:40:450
326279915515,115cyclictest19283-21latency_hist21:05:040
326279915512,119cyclictest10330-21grep23:30:040
326279915418,113cyclictest11079-21apt-get23:36:040
326279915417,112cyclictest10474-21apt-get20:10:150
326279915416,42cyclictest7262-21apt-get19:50:170
326279915414,116cyclictest12343-21memory20:20:420
326279915321,101cyclictest19917-21apt-get00:25:220
326279915317,25cyclictest8201-21memory23:15:420
326279915314,101cyclictest16882-21snmpd21:00:050
326279915313,119cyclictest12361-21forks23:40:420
326279915311,42cyclictest15955-21grep00:00:460
326279915310,119cyclictest30135-21if_eth022:10:410
326279915221,28cyclictest2232-21apt-get19:20:210
326279915220,104cyclictest3822-21apt-get19:30:200
326279915219,106cyclictest13696-21apt-get20:30:180
326279915218,26cyclictest22773-21memory21:25:440
326279915218,25cyclictest976-21munin-node19:15:060
326279915218,105cyclictest30774-21apt-get22:15:180
326279915217,111cyclictest27801-21memory21:55:430
326279915213,117cyclictest8760-21munin-run20:00:020
326279915211,101cyclictest22351-21grep21:21:050
326279915114,25cyclictest5808-21memory23:00:420
326279915113,113cyclictest12901-21apt-get20:25:160
326279915111,24cyclictest12784-21systemd-journal00:30:180
326279915111,121cyclictest5344-1kworker/u3:419:45:190
326279915111,118cyclictest18982-21cron00:20:000
326279915017,26cyclictest3345-21ntp_states19:25:520
326279915016,25cyclictest21621-21diskstats00:35:330
326279915016,23cyclictest10495-21diskstats23:30:320
326279915016,111cyclictest1574-21irqstats19:15:560
326279915016,107cyclictest29292-21diskstats22:05:340
326279915014,40cyclictest4371-21zcat22:50:540
326279914934,97cyclictest29111-21latency_hist22:05:040
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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