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2026-04-22 - 09:52

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 highest latencies:
System rack5slot7s.osadl.org (updated Wed Apr 22, 2026 00:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
19247224322188,96sleep00-21swapper19:08:280
194639916636,109cyclictest6849-21grep00:21:030
194639916324,29cyclictest25612-21apt-get23:01:000
194639916240,102cyclictest3052-21sshd20:41:150
194639916117,119cyclictest29833-21apt-get20:10:280
194639916014,120cyclictest2648-21apt-get00:01:350
194639915919,24cyclictest23018-21apt-get19:31:160
194639915819,116cyclictest26271-21diskstats23:05:320
194639915817,24cyclictest1951-21apt-get23:55:170
194639915816,113cyclictest23698-21apt-get22:50:190
194639915717,116cyclictest28053-21munin-run20:00:020
194639915631,17cyclictest0-21swapper22:55:570
194639915617,115cyclictest15622-21/usr/sbin/munin22:00:400
194639915613,25cyclictest21900-21/usr/sbin/munin22:41:390
194639915610,40cyclictest12660-21zcat21:40:570
194639915518,115cyclictest12784-21systemd-journal00:40:010
194639915512,118cyclictest4811-21head20:51:100
194639915510,121cyclictest5414-21grep20:55:570
19463991549,120cyclictest11187-21sort21:31:000
194639915418,110cyclictest29606-21apt-get23:25:180
194639915415,114cyclictest28693-21munin-run23:20:020
194639915411,118cyclictest31486-21cron20:20:000
19463991539,24cyclictest28752-21wc20:01:030
194639915321,27cyclictest32420-21apt-get20:25:220
194639915313,117cyclictest7940-21modprobe00:30:010
194639915312,121cyclictest29119-21grep23:20:500
194639915311,119cyclictest27593-21ps23:11:470
19463991529,24cyclictest4162-21ps00:06:020
19463991529,117cyclictest11709-21tr21:35:500
194639915216,23cyclictest20415-21df19:15:160
194639915216,22cyclictest19324-21users22:21:060
194639915212,116cyclictest26518-21grep19:50:050
194639915211,119cyclictest17553-21sort22:11:000
194639915210,119cyclictest12784-21systemd-journal20:40:020
194639915210,117cyclictest13582-21grep21:46:030
194639915172,35cyclictest436-21cstates23:45:240
194639915125,17cyclictest0-21swapper23:50:560
194639915121,27cyclictest31309-21diskstats23:35:340
194639915118,108cyclictest22185-21users19:21:070
194639915111,35cyclictest3239-21apt-get20:45:280
194639915111,23cyclictest6282-21mailstats21:00:590
194639915110,41cyclictest8682-21grep00:31:100
194639915110,25cyclictest32453-21wc23:40:560
194639915017,24cyclictest23143-21memory22:45:500
194639915010,25cyclictest24318-21irqstats19:35:450
194639915010,24cyclictest22320-21/usr/sbin/munin19:26:110
194639915010,116cyclictest32190-21sort20:21:020
194639914929,21cyclictest1185-21wc20:30:560
194639914924,21cyclictest0-21swapper19:41:020
194639914917,108cyclictest16937-21apt22:10:000
194639914912,96cyclictest272-21snmpd21:59:000
194639914912,26cyclictest4658-21/usr/sbin/munin00:10:240
194639914912,23cyclictest20257-21/usr/sbin/munin22:30:280
194639914833,93cyclictest8308-21df_inode21:15:320
194639914815,26cyclictest19560-21apt-get19:10:110
194639914812,112cyclictest7996-21cat21:11:050
194639914810,97cyclictest7302-21apt21:10:010
194639914716,25cyclictest30602-21/usr/sbin/munin23:30:410
194639914714,110cyclictest13829-21/usr/sbin/munin21:50:460
194639914712,107cyclictest17831-21/usr/sbin/munin22:16:020
19463991469,115cyclictest26819-21cat19:50:470
194639914630,93cyclictest0-21swapper21:25:560
194639914618,99cyclictest28969-21apt-get20:05:220
194639914610,113cyclictest20208-21ls22:30:030
194639914515,22cyclictest5627-21memory00:15:430
194639914510,25cyclictest21057-21apt-get22:35:130
194639914417,25cyclictest9139-21df_inode21:20:290
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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