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2026-04-07 - 07:28

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #4

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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Data to construct the above plot have been generated using the RT test utility cyclictest.

Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rackeslot4s.osadl.org (updated Tue Apr 07, 2026 00:44:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3237932995445,8cyclictest3486721-21kworker/u8:4+flush-259:023:10:250
3237932994338,4cyclictest3326524-21apt-get20:35:110
3237937993633,2cyclictest3486721-21kworker/u8:4+events_unbound23:30:132
3237937993529,4cyclictest3372642-21kworker/u8:3+flush-259:021:45:152
3237932993529,4cyclictest252-21systemd-journal20:45:160
3237942993429,4cyclictest3264734-21/usr/sbin/munin19:35:223
3237934993327,4cyclictest3388118-21latency_hist21:35:011
3237932993125,4cyclictest252-21systemd-journal21:43:180
3237934993025,3cyclictest3321385-21apt-get20:30:111
3237932993024,4cyclictest252-21systemd-journal21:40:000
3237932993023,5cyclictest3574272-21ntpq00:30:190
3237942992924,3cyclictest3248169-21apt-get19:20:003
3237934992922,5cyclictest252-21systemd-journal22:40:001
3237932992925,3cyclictest3362543-21kworker/u8:1+flush-259:022:00:250
3237932992924,4cyclictest3274836-21kworker/u8:2+flush-259:020:15:210
3237932992824,3cyclictest3280199-21kworker/u8:1+flush-259:020:00:250
3237932992822,4cyclictest3247293-21ntpq19:15:210
3237942992723,3cyclictest3352226-21/usr/sbin/munin21:00:153
3237942992722,3cyclictest252-21systemd-journal22:47:233
3237937992723,3cyclictest3398913-21kworker/u8:2+flush-259:021:55:002
3237937992723,3cyclictest3315865-21kworker/u8:1+flush-259:020:50:232
3237937992722,4cyclictest3254013-21apt-get19:25:102
3237934992723,3cyclictest3538748-21gpgv00:00:001
323793299270,26cyclictest1-21systemd22:07:220
3237942992620,4cyclictest3559685-21latency_hist00:20:013
3237937992623,2cyclictest3398913-21kworker/u8:2+flush-259:023:20:182
3237937992622,3cyclictest3486095-21kworker/u8:3+flush-259:023:08:312
3237937992621,4cyclictest3174349-21kworker/u8:4+flush-259:019:45:212
3237934992620,4cyclictest3290484-21/usr/sbin/munin20:00:141
3237934992620,4cyclictest252-21systemd-journal21:10:001
3237932992622,3cyclictest3274836-21kworker/u8:2+flush-259:020:15:010
3237937992521,3cyclictest3253980-21kworker/u8:2+flush-259:019:35:312
3237937992519,4cyclictest3274836-21kworker/u8:2+events_unbound19:52:142
3237934992520,3cyclictest252-21systemd-journal21:05:001
3237932992521,3cyclictest3362543-21kworker/u8:1+flush-259:022:25:000
3237942992420,3cyclictest3174349-21kworker/u8:4+flush-259:019:20:163
3237942992317,4cyclictest3414402-21latency_hist22:00:013
3237937992320,2cyclictest3570033-21kworker/u8:1+flush-259:000:35:182
3237937992320,2cyclictest3513007-21kworker/u8:2+events_unbound00:25:162
3237937992320,2cyclictest3326262-21turbostat.cron20:35:002
3237937992319,3cyclictest3398913-21kworker/u8:2+flush-259:022:10:242
3237937992317,4cyclictest3486721-21kworker/u8:4+flush-259:023:50:162
3237934992319,3cyclictest3513007-21kworker/u8:2+flush-259:000:15:151
3237932992319,3cyclictest3486721-21kworker/u8:4+flush-259:023:15:260
3237932992319,3cyclictest3274836-21kworker/u8:2+flush-259:020:25:240
3237932992318,4cyclictest3549510-21kworker/u8:3+flush-259:000:20:040
3237932992317,4cyclictest3352029-21kworker/u8:0+flush-259:021:10:160
3237932992317,4cyclictest252-21systemd-journal19:51:120
323793299230,22cyclictest1-21systemd21:16:170
3237942992216,4cyclictest3549280-21latency_hist00:10:003
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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