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2026-05-14 - 07:06

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 May 14, 2026 00:45:08)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
10681224452204,96sleep00-21swapper19:08:500
108589916420,113cyclictest6812-21apt-get22:00:190
108589916315,109cyclictest15526-21cron22:55:000
108589916219,112cyclictest2553-21apt-get21:35:170
108589916215,124cyclictest20807-21memory20:05:430
108589916037,23cyclictest13831-21timerwakeupswit22:41:020
108589915915,119cyclictest4068-21apt-get21:45:450
108589915822,109cyclictest19882-21diskstats20:00:320
108589915822,107cyclictest28135-21apt-get00:10:200
108589915814,119cyclictest19550-21munin-run23:20:020
108589915618,26cyclictest27788-21apt-get20:50:170
108589915616,23cyclictest630-21munin-run00:40:040
108589915614,26cyclictest22870-21run-parts20:20:020
108589915614,119cyclictest24833-21apt23:50:020
108589915613,29cyclictest29282-21sendmail21:00:010
108589915577,55cyclictest20042-21snmpd19:42:020
108589915518,97cyclictest27232-21memory20:45:430
108589915516,118cyclictest21957-21apt-get23:36:160
108589915515,21cyclictest15204-21apt-get19:36:150
108589915514,117cyclictest11864-21/usr/sbin/munin22:30:440
108589915512,120cyclictest19244-21grep19:55:470
108589915512,102cyclictest28960-21apt-get00:15:280
108589915510,123cyclictest20042-21snmpd21:40:540
10858991539,122cyclictest20778-21grep23:25:480
10858991539,121cyclictest17667-21zcat23:05:550
10858991539,118cyclictest31319-21switchtime00:26:000
108589915342,90cyclictest5259-21cstates21:50:290
108589915326,20cyclictest0-21swapper23:00:550
108589915318,22cyclictest26788-21memory00:00:430
108589915317,37cyclictest32029-21memory21:15:440
108589915315,23cyclictest13825-21diskstats19:25:300
108589915314,115cyclictest20358-21modprobe23:25:010
108589915221,26cyclictest24581-21apt-get20:30:150
108589915218,28cyclictest14511-21apt-get19:30:160
108589915214,113cyclictest25670-21tr20:35:480
108589915211,27cyclictest11196-21wc22:25:530
108589915210,98cyclictest13188-21grep22:40:050
108589915118,26cyclictest8402-21apt-get22:10:160
108589915118,110cyclictest9852-21users22:16:040
108589915118,107cyclictest11666-21munin-node19:15:070
108589915114,114cyclictest18264-21diskstats19:50:320
108589915112,116cyclictest18566-21switchtime23:10:590
108589915014,113cyclictest17534-21irqstats19:45:470
108589915013,25cyclictest21776-21ls23:30:580
108589915013,113cyclictest15630-21apt-get22:55:150
108589915012,23cyclictest12191-21df19:15:430
108589914927,20cyclictest0-21swapper20:25:230
108589914919,28cyclictest6099-21diskstats21:55:330
108589914913,37cyclictest30440-21memory21:05:430
108589914913,115cyclictest26430-21munin-run00:00:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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