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2026-07-27 - 07:13

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 27, 2026 00:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
24487224542209,88sleep00-21swapper19:06:570
248759916317,27cyclictest7228-21irqstats23:56:080
248759916116,24cyclictest8598-21munin-run00:05:050
248759916016,24cyclictest27042-21df_inode19:20:290
248759915818,116cyclictest528-21df_inode23:15:270
248759915815,117cyclictest7146-21/usr/sbin/munin20:36:560
248759915814,28cyclictest10299-21ps20:55:540
248759915723,21cyclictest0-21swapper23:45:560
248759915719,116cyclictest8596-21apt-get00:06:150
248759915712,121cyclictest16667-21awk21:35:510
248759915618,109cyclictest23621-21apt-get22:20:190
248759915615,99cyclictest14076-21df_inode00:35:270
248759915615,117cyclictest31194-21apt23:05:010
248759915521,31cyclictest19692-21diskstats21:55:320
248759915519,108cyclictest21200-21apt-get22:05:160
248759915518,24cyclictest13864-21munin-run21:20:030
248759915517,27cyclictest25682-21munin-node19:15:080
248759915515,54cyclictest12044-21apt-get00:25:500
248759915511,120cyclictest29030-21uname22:51:110
248759915418,109cyclictest5706-21apt-get20:30:190
248759915417,24cyclictest1354-21df23:20:250
248759915411,121cyclictest27452-1kworker/u3:622:41:510
248759915315,98cyclictest7556-21apt-get20:40:290
248759915315,117cyclictest25314-21df22:30:280
248759915315,115cyclictest11230-21munin-run00:20:010
248759915310,120cyclictest26511-21/usr/sbin/munin22:36:010
248759915236,21cyclictest11057-21ntp_kernel_pll_21:00:470
248759915230,101cyclictest3155-21vmstat20:11:090
248759915217,111cyclictest13353-21irqstats00:30:470
248759915216,25cyclictest32430-21apt19:55:010
24875991519,117cyclictest1123-21latency20:00:430
248759915120,102cyclictest4116-21apt-get20:20:210
248759915116,96cyclictest30024-21munin-run19:40:020
248759915114,115cyclictest28701-21irqstats19:30:400
248759915111,23cyclictest14727-21wc21:25:050
248759915110,27cyclictest2253-21grep20:06:030
248759915032,22cyclictest3818-21/usr/sbin/munin20:16:030
248759915031,99cyclictest30792-21grep19:41:040
248759915014,112cyclictest12721-21ps21:10:550
248759915011,115cyclictest18093-21sshd21:45:280
248759914917,106cyclictest15574-21apt-get21:30:180
248759914916,107cyclictest27863-21apt-get22:45:280
248759914915,94cyclictest30362-21cron23:00:010
248759914912,96cyclictest359-21ntpq19:55:470
248759914912,23cyclictest6677-21grep23:51:030
248759914826,22cyclictest0-21swapper19:16:180
248759914816,108cyclictest31044-21df_inode19:45:290
248759914813,113cyclictest5017-21df_inode20:25:290
248759914813,111cyclictest15027-21grep21:25:470
248759914813,109cyclictest9139-21/usr/sbin/munin20:50:480
248759914812,23cyclictest10083-21ps00:11:040
248759914811,112cyclictest31504-21ls23:05:430
248759914728,18cyclictest0-21swapper23:35:240
248759914724,102cyclictest0-21swapper22:00:430
248759914718,104cyclictest24418-21apt-get22:25:170
248759914717,37cyclictest4569-21df23:40:280
248759914716,25cyclictest2850-21apt-get23:30:180
248759914716,104cyclictest22786-21/usr/sbin/munin22:15:390
248759914713,112cyclictest28426-21munin-plugin-st19:30:020
248759914713,112cyclictest12251-21munin-plugin-st21:10:010
248759914711,27cyclictest2424-21proc_pri23:25:550
248759914711,22cyclictest11523-21/usr/sbin/munin00:20:380
248759914614,110cyclictest9003-21users20:46:050
248759914611,110cyclictest32085-21/usr/sbin/munin23:11:030
248759914514,24cyclictest22091-21df22:10:250
248759914417,101cyclictest18785-21apt-get21:50:160
248759914415,104cyclictest17193-21/usr/sbin/munin21:40:220
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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