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2026-04-01 - 14:59

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 Wed Apr 01, 2026 12:45:08)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
14018224322191,99sleep00-21swapper07:09:080
141599916717,105cyclictest14009-21apt-get10:25:260
141599916217,27cyclictest19656-21apt11:00:010
141599916111,23cyclictest27840-21munin-node11:50:120
141599915821,107cyclictest15068-21diskstats10:30:400
141599915817,114cyclictest27853-21irqstats08:30:400
141599915615,26cyclictest19309-21munin-run07:40:030
141599915540,24cyclictest21528-21/usr/sbin/munin11:10:310
141599915517,98cyclictest32616-21diskstats09:00:330
141599915516,116cyclictest26092-21apt-get08:20:170
141599915514,119cyclictest25261-21head11:31:160
141599915513,123cyclictest22525-21munin-run08:00:030
141599915416,96cyclictest2504-21apt-get12:32:010
141599915415,23cyclictest22943-21df08:00:400
141599915413,26cyclictest18844-21cron10:55:010
141599915413,119cyclictest25258-21apt-get08:15:180
141599915413,116cyclictest28683-21wc08:35:430
141599915413,115cyclictest15667-21/usr/sbin/munin07:16:030
141599915318,112cyclictest13828-21munin-run10:25:010
141599915316,24cyclictest3961-21munin-run09:25:010
141599915314,39cyclictest1714-21munin-run12:30:040
141599915314,27cyclictest27628-21sort11:46:040
141599915314,116cyclictest12847-21sort10:15:590
141599915313,117cyclictest23657-21grep11:21:020
141599915312,117cyclictest20450-21awk11:01:070
141599915217,25cyclictest30092-21apt-get08:45:200
141599915216,25cyclictest5321-21/usr/sbin/munin09:30:580
141599915216,112cyclictest30432-21irqstats12:05:410
141599915214,114cyclictest22210-21apt11:15:120
141599915213,24cyclictest3540-21apt12:40:010
141599915213,21cyclictest26253-21apt-get11:40:170
141599915211,26cyclictest5653-1kworker/u3:110:01:230
141599915122,28cyclictest8306-21memory09:50:470
141599915119,25cyclictest31849-21apt-get12:15:170
141599915118,110cyclictest16453-21munin-run10:40:020
141599915116,111cyclictest9562-21munin-run10:00:060
141599915115,112cyclictest21167-21if_err_eth007:50:350
141599915113,24cyclictest2542-21diskstats09:15:320
141599915111,39cyclictest20223-21/usr/sbin/munin07:45:110
141599915110,118cyclictest18005-21sed10:46:040
141599915026,101cyclictest28636-21apt-get11:55:200
141599915016,25cyclictest23843-21irqstats08:05:480
141599915015,23cyclictest31584-21munin-run08:55:030
141599915014,110cyclictest29295-21/usr/sbin/munin08:41:060
141599915013,112cyclictest24534-21munin-run11:30:010
141599915011,116cyclictest26886-21apt-get08:25:180
141599915011,116cyclictest19855-21fgrep07:40:540
141599914922,101cyclictest20733-21diskstats11:05:350
141599914916,111cyclictest18467-21users07:31:080
141599914914,22cyclictest7941-21awk09:46:090
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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