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2026-06-13 - 04:05

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 Sat Jun 13, 2026 00:44:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3988543996864,3cyclictest4050614-21kworker/u8:4+flush-259:020:40:011
3988543994641,4cyclictest4107593-21latency_hist21:05:011
3988543993935,3cyclictest335557-21systemd-journal23:32:021
3988541993933,4cyclictest4013426-21ntpq19:30:190
3988547993834,3cyclictest4107611-21kworker/u8:4+flush-259:022:20:003
3988547993630,4cyclictest95629-21cp00:00:013
3988543993532,2cyclictest4107611-21kworker/u8:4+events_unbound21:55:171
3988543993428,4cyclictest3988476-21latency_hist19:10:011
3988547993327,4cyclictest4175434-21latency_hist22:10:003
3988544993329,2cyclictest4019658-21kworker/u8:4+flush-259:019:45:162
3988547993227,4cyclictest4075371-21ntpq20:30:213
3988543993228,3cyclictest4097533-21apt-get20:55:111
3988541993227,3cyclictest101109-21apt-get00:05:160
3988547993127,3cyclictest4107611-21kworker/u8:4+flush-259:022:10:143
3988544993126,3cyclictest4029981-21kworker/u8:3+flush-259:019:55:172
3988543993127,3cyclictest4029981-21kworker/u8:3+events_unbound20:30:211
3988547993028,1cyclictest127009-21fwupd00:30:013
3988543993027,2cyclictest3998828-21kworker/u8:1+flush-259:019:20:261
3988543993026,3cyclictest4019293-21kworker/u8:0+flush-259:019:49:591
3988543993025,3cyclictest75194-21kworker/u8:3+flush-259:023:50:211
3988543993025,3cyclictest3988737-21/usr/sbin/munin19:10:181
3988541992924,3cyclictest4191085-21kworker/u8:1+flush-259:022:25:160
3988544992821,5cyclictest335557-21systemd-journal23:00:002
3988541992821,5cyclictest335557-21systemd-journal00:35:000
3988547992724,2cyclictest81399-21kworker/u8:1+flush-259:000:05:203
3988547992723,3cyclictest335557-21systemd-journal23:10:283
3988547992723,3cyclictest132423-21apt-get00:35:103
3988544992720,5cyclictest95588-21latency_hist00:00:012
3988543992719,5cyclictest100838-21latency_hist00:04:591
3988541992723,3cyclictest2337-21kworker/u8:4+flush-259:023:05:010
3988543992622,3cyclictest4107611-21kworker/u8:4+events_unbound21:45:201
3988543992621,3cyclictest74687-21base6423:40:001
3988543992621,3cyclictest4040314-21kworker/u8:2+events_unbound23:25:141
3988547992521,3cyclictest4185763-21kworker/u8:0+events_unbound22:30:183
3988547992518,5cyclictest4081454-21cp20:40:013
3988544992521,3cyclictest2337-21kworker/u8:4+events_unbound23:00:122
3988544992520,4cyclictest335557-21systemd-journal00:30:002
3988543992518,5cyclictest6426-21ntpq22:30:181
3988543992518,5cyclictest335557-21systemd-journal22:25:001
3988543992518,5cyclictest116283-21latency_hist00:19:591
3988541992522,2cyclictest12493-21kworker/u8:1+flush-259:023:05:240
3988547992420,3cyclictest12493-21kworker/u8:1+flush-259:023:15:213
3988547992419,4cyclictest54116-21apt-get23:20:113
3988547992419,4cyclictest335557-21systemd-journal20:04:593
3988544992420,3cyclictest4102195-21kworker/u8:1+flush-259:021:20:212
3988544992418,4cyclictest4128841-21cat21:25:012
3988543992420,2cyclictest4029981-21kworker/u8:3+flush-259:019:55:191
3988547992320,2cyclictest4029981-21kworker/u8:3+events_unbound20:15:193
3988547992320,2cyclictest4019293-21kworker/u8:0+flush-259:019:40:203
3988544992318,4cyclictest335557-21systemd-journal22:09:592
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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