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2026-07-13 - 05:39

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 Mon Jul 13, 2026 00:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
27593224602213,87sleep00-21swapper19:07:050
279659916411,130cyclictest20933-21uname21:40:410
27965991628,23cyclictest13167-21apt-get20:56:360
279659916014,120cyclictest29905-21apt-get19:20:530
279659915919,116cyclictest29702-21munin-run22:35:030
279659915916,120cyclictest16152-21memory00:26:240
279659915715,117cyclictest6482-21apt-get23:30:250
279659915640,94cyclictest5624-21apt-get23:25:140
279659915616,114cyclictest10506-21users23:51:060
279659915616,101cyclictest8498-21memory23:40:440
279659915516,36cyclictest25126-21irqstats22:06:140
279659915516,115cyclictest14378-21tr00:15:480
279659915515,22cyclictest10299-21memory20:35:440
279659915513,39cyclictest15210-21awk00:20:480
279659915513,117cyclictest30997-21/usr/sbin/munin22:40:430
279659915512,117cyclictest18769-21sendmail_mailst21:25:570
279659915434,95cyclictest15490-21ps21:05:560
279659915416,48cyclictest5349-21df_inode20:05:300
279659915416,27cyclictest4557-21diskstats20:00:300
279659915412,116cyclictest23553-21grep21:55:570
279659915381,51cyclictest12497-21apt-get00:05:130
27965991538,121cyclictest29004-21sort19:15:170
279659915318,107cyclictest1602-21apt-get23:00:190
279659915317,114cyclictest28381-21irqstats22:25:380
279659915317,112cyclictest13169-21/usr/sbin/munin20:55:050
279659915316,24cyclictest8464-21apt-get20:25:160
279659915315,97cyclictest11530-21apt-get00:00:270
279659915315,114cyclictest32683-21memory22:50:440
279659915314,117cyclictest32708-21apt-get19:35:310
279659915312,102cyclictest20211-21ntpq21:35:480
279659915310,26cyclictest9708-21/usr/sbin/munin23:46:050
279659915228,19cyclictest0-21swapper23:05:460
279659915219,106cyclictest7909-21memory20:20:460
279659915216,37cyclictest7550-21munin-run20:20:040
279659915216,112cyclictest28772-21munin-node19:15:090
279659915215,23cyclictest11741-21/usr/sbin/munin20:45:230
279659915215,21cyclictest13527-21memory00:10:450
279659915214,96cyclictest7905-21/usr/sbin/munin23:36:070
279659915213,22cyclictest22337-21apt-get21:50:180
279659915213,114cyclictest29870-21apt-get22:35:250
279659915212,31cyclictest14961-21grep21:01:080
279659915114,24cyclictest17275-21sort21:16:020
279659915113,117cyclictest18105-21cat00:36:030
279659915113,114cyclictest4819-21/usr/sbin/munin23:20:410
279659915110,116cyclictest9944-21sshd20:35:010
279659915028,22cyclictest0-21swapper20:40:350
279659915013,113cyclictest16086-21irqstats21:10:380
279659915011,27cyclictest22200-21/usr/sbin/munin21:46:060
279659914917,23cyclictest31295-21memory19:25:520
279659914915,47cyclictest4092-21df_inode23:15:280
279659914915,23cyclictest17272-21/usr/sbin/munin00:31:100
279659914915,108cyclictest26570-21/usr/sbin/munin22:15:590
279659914914,111cyclictest7155-21snmpd21:30:470
279659914914,107cyclictest2139-21df_inode19:45:270
279659914913,111cyclictest31833-21uname22:45:410
279659914816,23cyclictest1021-21memory22:55:440
279659914816,106cyclictest3625-21apt-get19:55:220
279659914814,35cyclictest32543-21munin-run19:35:050
279659914813,111cyclictest2924-21expr19:50:240
279659914812,27cyclictest1366-21sshd19:40:420
279659914812,113cyclictest3818-21unixbench_singl23:11:050
279659914734,92cyclictest6800-21cat20:15:040
279659914714,24cyclictest10747-21df_inode23:55:280
279659914714,109cyclictest24381-21fgrep22:00:560
279659914612,109cyclictest27404-21apt-get22:20:140
279659914518,101cyclictest25780-21apt-get22:10:290
279659914510,22cyclictest18137-21ls21:21:020
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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