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2026-04-28 - 22:37

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 100 highest latencies:
System rack5slot7s.osadl.org (updated Tue Apr 28, 2026 12:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
30662224412197,97sleep00-21swapper07:05:090
319229916314,123cyclictest11349-21/usr/sbin/munin08:25:110
319229915918,98cyclictest17661-21munin-run12:20:020
319229915817,100cyclictest13812-21munin-run08:40:010
319229915814,119cyclictest31593-21sort10:30:090
319229915537,22cyclictest4843-21latency_hist07:45:050
319229915519,94cyclictest20874-21munin-run12:40:010
319229915516,23cyclictest1062-21apt-get10:40:260
319229915511,121cyclictest15019-21grep08:45:500
319229915416,114cyclictest6349-21apt07:55:010
319229915415,24cyclictest1037-21sed10:40:090
319229915413,117cyclictest3718-21apt-get10:55:170
319229915321,27cyclictest18843-21diskstats09:10:340
319229915320,20cyclictest5608-21diskstats11:05:330
319229915318,113cyclictest31660-21apt-get10:30:280
319229915317,111cyclictest3550-21munin-run10:55:050
319229915315,115cyclictest8032-21munin-run11:20:030
319229915313,118cyclictest6329-21/usr/sbin/munin11:11:150
319229915310,117cyclictest26776-21/usr/sbin/munin10:00:360
319229915236,18cyclictest24313-21wc09:45:030
319229915227,18cyclictest0-21swapper08:40:440
319229915223,103cyclictest26066-21diskstats09:55:330
319229915216,114cyclictest20239-21munin-run09:20:010
319229915215,25cyclictest10372-21munin-run08:20:030
319229915214,114cyclictest30694-21munin-plugin-st10:25:000
319229915212,25cyclictest32442-21find07:10:590
319229915210,99cyclictest9063-21/usr/sbin/munin11:25:340
319229915139,91cyclictest15858-21open_files08:50:530
319229915120,27cyclictest4817-21diskstats11:00:410
319229915113,117cyclictest10643-21diskstats11:35:350
319229915112,23cyclictest23444-21munin-plugin-st09:40:020
319229915112,113cyclictest10908-21grep08:20:560
319229915044,24cyclictest8585-21/usr/sbin/munin11:20:570
319229915022,102cyclictest20359-21apt-get09:20:190
319229915021,29cyclictest12257-21df_inode11:45:290
319229915020,106cyclictest12317-21apt-get08:30:140
319229915014,97cyclictest25060-21munin-run09:50:010
319229915014,96cyclictest7971-21munin-run08:05:020
319229915014,25cyclictest272-21snmpd10:15:410
319229915010,100cyclictest21440-21tr09:25:460
319229914933,20cyclictest12784-21systemd-journal09:35:010
319229914918,104cyclictest19370-21apt-get12:30:170
319229914918,104cyclictest16320-21apt-get08:55:180
319229914916,23cyclictest5451-21wc07:46:020
319229914916,21cyclictest2308-21users07:26:050
319229914913,111cyclictest2741-21sshd10:49:350
319229914911,98cyclictest8630-21grep08:06:020
319229914911,38cyclictest6734-21tr07:55:470
319229914817,26cyclictest17778-21/usr/sbin/munin12:20:520
319229914814,24cyclictest18632-21munin-run09:10:020
319229914813,36cyclictest9277-21awk08:10:550
319229914813,23cyclictest14777-21sort12:00:420
319229914813,112cyclictest12050-21apt11:45:010
31922991479,39cyclictest17277-21if_err_eth009:00:350
319229914715,36cyclictest735-21munin-run07:20:040
319229914618,24cyclictest25855-21apt09:55:000
319229914614,111cyclictest28613-21memory10:10:450
319229914517,105cyclictest2555-21df_inode07:30:300
319229914515,108cyclictest27750-21irqstats10:05:400
319229914513,109cyclictest9987-21wc11:30:450
319229914512,28cyclictest16151-21/usr/sbin/munin12:10:520
319229914510,113cyclictest13383-21mailstats11:50:560
31922991449,111cyclictest3860-21unixbench_singl07:36:030
319229914427,99cyclictest6920-21kworker/u2:412:05:130
319229914416,25cyclictest13842-21df11:55:270
319229914413,107cyclictest18864-21/usr/sbin/munin12:25:460
319229914314,29cyclictest1511-21users07:21:060
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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