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2026-03-26 - 05:04

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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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: 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 Thu Mar 26, 2026 00:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2679728994845,2cyclictest2788526-21kworker/u8:2+flush-259:021:00:233
2679723994037,2cyclictest2908270-21kworker/u8:2+events_unbound23:45:231
2679723993532,2cyclictest2720936-21kworker/u8:4+events_unbound21:40:151
2679723993531,3cyclictest2939841-21apt-get23:20:111
2679723993531,3cyclictest2908270-21kworker/u8:2+events_unbound22:55:231
2679719993532,2cyclictest2939601-21kworker/u8:3+flush-259:023:25:150
2679723993431,2cyclictest2720936-21kworker/u8:4+events_unbound20:45:201
2679723993430,3cyclictest2829751-21kworker/u8:2+events_unbound21:45:151
2679723993430,3cyclictest2690281-21apt-get19:20:121
2679719993432,1cyclictest1-21systemd20:20:000
2679723993330,2cyclictest2788526-21kworker/u8:2+events_unbound21:00:221
2679723993330,2cyclictest2720936-21kworker/u8:4+events_unbound21:20:261
2679723993229,2cyclictest2626182-21kworker/u8:0+events_unbound19:30:241
2679723993227,2cyclictest2720936-21kworker/u8:4+events_unbound20:05:251
2679723993226,3cyclictest2767553-21kworker/u8:0+events_unbound21:10:221
2679726993027,2cyclictest2720936-21kworker/u8:4+flush-259:020:00:252
2679723993027,2cyclictest2886809-21kworker/u8:0+events_unbound22:48:231
2679723993026,3cyclictest2908270-21kworker/u8:2+events_unbound23:30:231
2679723993026,3cyclictest2829751-21kworker/u8:2+events_unbound21:54:241
2679726992926,2cyclictest2767553-21kworker/u8:0+flush-259:021:25:002
2679726992925,3cyclictest2928837-21apt-get23:10:002
2679723992926,2cyclictest2976248-21kworker/u8:3+events_unbound00:25:211
2679723992926,2cyclictest2908270-21kworker/u8:2+events_unbound00:05:221
2679723992925,3cyclictest2731435-21apt-get20:00:111
2679723992824,3cyclictest2908270-21kworker/u8:2+events_unbound00:03:331
2679719992824,3cyclictest2767929-21/usr/sbin/munin20:35:140
2679726992724,2cyclictest2908270-21kworker/u8:2+flush-259:023:50:002
2679723992724,2cyclictest2690041-21kworker/u8:1+events_unbound19:45:241
2679723992723,3cyclictest2965720-21kworker/u8:0+events_unbound00:17:121
2679723992723,3cyclictest2955440-21kworker/u8:1+events_unbound23:50:271
2679726992620,4cyclictest2856388-21diskstats22:00:142
2679723992623,2cyclictest2720936-21kworker/u8:4+events_unbound22:00:161
2679723992623,2cyclictest2720936-21kworker/u8:4+events_unbound21:17:221
2679723992622,3cyclictest2965720-21kworker/u8:0+events_unbound00:35:141
2679726992519,4cyclictest252-21systemd-journal20:20:002
2679723992522,3cyclictest2866258-21kworker/u8:1+events_unbound22:14:231
2679723992522,2cyclictest2939601-21kworker/u8:3+events_unbound23:25:141
2679723992522,2cyclictest2908270-21kworker/u8:2+events_unbound23:05:261
2679723992522,2cyclictest2829751-21kworker/u8:2+events_unbound22:17:221
2679723992522,2cyclictest2814159-21kworker/u8:3+events_unbound21:25:511
2679723992522,2cyclictest2690041-21kworker/u8:1+events_unbound20:15:141
2679723992521,3cyclictest2929497-21kworker/u8:0+events_unbound23:13:221
2679723992521,3cyclictest2626182-21kworker/u8:0+events_unbound19:39:231
2679719992522,2cyclictest2783157-21kworker/u8:1+flush-259:021:09:590
2679719992521,3cyclictest2690041-21kworker/u8:1+flush-259:020:20:220
2679726992419,4cyclictest2945003-21apt-get23:25:122
2679723992421,2cyclictest2626182-21kworker/u8:0+events_unbound19:10:151
2679723992420,3cyclictest2976248-21kworker/u8:3+events_unbound23:57:341
2679723992420,3cyclictest2976248-21kworker/u8:3+events_unbound00:24:431
2679723992420,3cyclictest2788526-21kworker/u8:2+events_unbound21:05:171
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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