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2026-06-11 - 08:43

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 Jun 11, 2026 00:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
13258224622207,97sleep00-21swapper19:08:180
134909916216,29cyclictest18993-21/usr/sbin/munin19:40:460
134909916117,38cyclictest13469-21apt-get19:12:010
134909916116,117cyclictest27355-21apt-get23:50:190
134909916114,122cyclictest21358-21latency_hist19:55:070
134909916016,102cyclictest30236-21memory00:05:420
134909915914,121cyclictest1444-21latency_hist00:30:010
134909915812,27cyclictest24722-21apt-get20:16:480
134909915617,25cyclictest12574-21munin-run22:20:020
134909915616,23cyclictest3657-21snmpd20:23:370
134909915615,119cyclictest28445-21df23:55:380
134909915611,122cyclictest21449-21/usr/sbin/munin19:55:120
134909915517,25cyclictest24724-21munin-run20:15:040
134909915516,115cyclictest28969-21munin-run20:40:030
134909915513,39cyclictest20084-21/usr/sbin/munin19:45:470
134909915513,119cyclictest25646-21munin-run23:40:020
134909915510,54cyclictest32411-21/usr/sbin/munin00:20:510
13490991549,121cyclictest3657-21snmpd21:49:110
134909915418,96cyclictest17897-21irqstats22:50:380
134909915413,27cyclictest2850-21grep21:16:020
134909915411,98cyclictest23927-21munin-run20:10:010
13490991538,105cyclictest16309-21/usr/sbin/munin22:40:370
134909915330,104cyclictest27286-21head20:26:020
134909915316,114cyclictest17619-21memory19:30:430
134909915315,115cyclictest12569-21apt-get22:21:130
134909915312,98cyclictest15278-21wc22:35:050
134909915223,28cyclictest24147-21apt-get23:30:200
134909915220,103cyclictest16826-21memory19:25:450
134909915218,24cyclictest6148-21munin-run21:40:030
134909915217,22cyclictest9309-21users21:56:050
134909915216,22cyclictest3047-21munin-run00:40:020
134909915216,114cyclictest32294-21munin-run00:20:010
134909915215,23cyclictest18490-21ntp_states19:35:500
134909915213,25cyclictest633-21/usr/sbin/munin21:05:310
134909915212,119cyclictest22545-21df_inode20:00:370
134909915211,99cyclictest15650-21modprobe19:20:010
134909915211,117cyclictest13835-21diskstats22:25:370
134909915122,103cyclictest18521-21apt-get22:55:170
134909915115,113cyclictest22438-21munin-run23:20:020
134909915115,110cyclictest2033-21/usr/sbin/munin21:11:020
134909915113,116cyclictest32475-21uname21:00:400
134909915111,117cyclictest19921-21wc23:01:010
134909915110,25cyclictest4538-21cron21:30:010
134909915040,23cyclictest31063-21processes20:50:540
134909915035,23cyclictest3675-21unixbench_singl21:21:010
134909915032,93cyclictest10100-21grep22:01:040
134909915020,104cyclictest16931-21apt-get22:45:110
134909915017,107cyclictest20138-21apt-get23:05:140
134909915011,27cyclictest26470-21cat23:45:030
134909914917,109cyclictest10441-21irqstats22:05:370
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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