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2026-06-11 - 02:52

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 Wed Jun 10, 2026 12:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2209738994035,4cyclictest335557-21systemd-journal10:55:000
2209741993933,4cyclictest2526596-21latency_hist12:15:011
2209746993834,3cyclictest2432098-21kworker/u8:1+flush-259:011:25:212
2209746993834,3cyclictest2365011-21kworker/u8:2+flush-259:010:25:002
220973899381,35cyclictest1-21systemd10:10:000
2209741993630,4cyclictest335557-21systemd-journal10:52:341
2209738993528,5cyclictest2327535-21ntpq09:00:190
2209738993527,5cyclictest2256435-21latency_hist07:55:010
220973899350,33cyclictest1-21systemd10:05:000
220973899350,33cyclictest1-21systemd10:05:000
2209746993431,2cyclictest2277013-21kworker/u8:0+flush-259:009:20:192
2209748993328,3cyclictest2230712-21latency_hist07:30:003
2209746993329,3cyclictest2365011-21kworker/u8:2+flush-259:010:30:212
2209746993329,3cyclictest2282362-21kworker/u8:2+events_unbound08:25:172
2209738993326,5cyclictest2483580-21ntpq11:30:210
2209746993228,3cyclictest2365011-21kworker/u8:2+flush-259:009:45:202
2209746993127,3cyclictest2354441-21kworker/u8:1+flush-259:009:30:162
2209746993127,3cyclictest2225575-21kworker/u8:1+flush-259:007:30:212
2209738993122,6cyclictest335557-21systemd-journal11:54:590
2209748993026,3cyclictest2375288-21kworker/u8:4+flush-259:010:10:003
2209746993027,2cyclictest2365011-21kworker/u8:2+events_unbound10:10:142
2209746992926,2cyclictest2495499-21kworker/u8:0+flush-259:011:45:182
2209746992926,2cyclictest2432098-21kworker/u8:1+flush-259:011:30:182
2209746992925,3cyclictest2390810-21kworker/u8:0+flush-259:010:40:242
2209738992925,2cyclictest2287581-21apt-get08:25:110
2209748992822,5cyclictest2390773-21latency_hist10:05:003
2209748992822,5cyclictest2390773-21latency_hist10:05:003
2209746992825,2cyclictest2432098-21kworker/u8:1+flush-259:011:15:002
2209746992823,3cyclictest2432098-21kworker/u8:1+flush-259:012:00:002
2209746992821,4cyclictest335557-21systemd-journal12:37:202
2209741992824,3cyclictest2406472-21/usr/sbin/munin10:20:131
2209741992824,3cyclictest2246418-21/usr/sbin/munin07:45:151
2209741992824,3cyclictest2246418-21/usr/sbin/munin07:45:141
2209738992821,5cyclictest2447985-21diskstats11:00:140
2209738992821,5cyclictest2265778-21ntpq08:00:210
2209748992721,4cyclictest2220534-21cat07:20:013
2209746992723,3cyclictest2516329-21kworker/u8:3+events_unbound12:25:182
2209746992723,3cyclictest2432098-21kworker/u8:1+events_unbound12:20:142
2209746992723,3cyclictest2432098-21kworker/u8:1+events_unbound12:20:132
2209746992723,3cyclictest2292482-21kworker/u8:3+flush-259:009:35:222
2209746992722,4cyclictest2272113-21apt-get08:10:102
2209746992722,3cyclictest2338502-21kworker/u8:2+events_unbound09:25:162
2209738992721,4cyclictest335557-21systemd-journal12:09:330
2209748992620,4cyclictest2292457-21latency_hist08:30:013
2209746992623,2cyclictest2241039-21kworker/u8:3+flush-259:008:00:152
2209746992619,2cyclictest2505058-21kworker/u8:2+events_unbound12:00:212
2209738992620,4cyclictest2256857-21diskstats07:55:120
2209746992522,2cyclictest2277013-21kworker/u8:0+flush-259:008:20:212
2209746992522,2cyclictest2241039-21kworker/u8:3+events_unbound07:46:362
2209746992522,2cyclictest2241039-21kworker/u8:3+events_unbound07:46:352
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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