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2026-07-09 - 11:44

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 Jul 09, 2026 00:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
28554224322196,96sleep00-21swapper19:09:010
287099916013,125cyclictest12784-21systemd-journal21:12:160
287099915920,111cyclictest14624-21apt-get21:00:310
287099915816,115cyclictest19532-21apt-get21:31:290
287099915812,25cyclictest5178-21memory20:01:220
287099915810,122cyclictest27785-21systemctl22:20:010
287099915718,22cyclictest2562-21munin-run23:05:020
287099915715,100cyclictest12978-21apt-get20:50:180
287099915714,122cyclictest1455-21awk22:55:560
287099915712,28cyclictest5641-21cat23:21:000
287099915614,117cyclictest14477-21munin-run21:00:060
287099915612,119cyclictest5766-21sshd20:05:180
287099915518,114cyclictest10665-21df20:35:250
287099915515,27cyclictest28188-21tr22:20:470
287099915514,23cyclictest32600-21memory19:30:470
287099915427,21cyclictest0-21swapper23:51:030
287099915417,109cyclictest31912-21apt-get22:45:160
287099915416,23cyclictest30995-21munin-run22:40:030
287099915416,113cyclictest21312-21users21:36:130
287099915415,99cyclictest7155-21snmpd00:25:060
287099915317,114cyclictest6571-21apt-get23:31:320
287099915315,114cyclictest8062-21munin-run20:20:020
287099915312,25cyclictest24445-21sort21:56:000
287099915239,24cyclictest9524-21latency23:45:410
287099915217,19cyclictest29516-21munin-node19:15:030
287099915211,28cyclictest10531-21wc20:35:050
287099915211,24cyclictest18685-21unixbench_singl21:21:050
287099915210,119cyclictest17523-21ntp_states21:15:510
287099915210,117cyclictest22459-21uname21:45:410
287099915141,21cyclictest6860-21ntp_offset20:10:500
287099915131,22cyclictest30192-21apt22:35:010
287099915120,104cyclictest9294-21ntp_states20:25:530
287099915117,28cyclictest16277-21users21:06:120
287099915116,22cyclictest12290-21df_inode20:45:320
287099915115,113cyclictest4611-21apt-get20:00:040
287099915112,115cyclictest1430-21cat19:40:050
287099915111,118cyclictest3077-21grep23:05:550
287099915110,41cyclictest4677-21wc23:15:560
287099915030,21cyclictest0-21swapper00:30:120
287099915019,25cyclictest1522-21apt-get19:40:200
287099915017,108cyclictest3770-21ntp_states23:10:510
28709991499,41cyclictest23712-21grep21:51:030
287099914916,24cyclictest21586-21df_inode21:40:290
287099914916,109cyclictest8422-21memory20:20:450
287099914915,109cyclictest3811-21apt19:55:010
287099914912,97cyclictest797-21ls22:51:010
287099914912,22cyclictest11797-21wc00:00:230
287099914912,112cyclictest6368-21cut23:25:570
28709991489,114cyclictest29853-21sort19:15:220
287099914828,99cyclictest0-21swapper00:35:220
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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