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2026-05-15 - 06:34

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 Fri May 15, 2026 00:44:07)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3298869995535,14cyclictest3549390-21/usr/sbin/munin23:10:171
3298867995348,3cyclictest252-21systemd-journal20:42:090
3298875994841,5cyclictest3371898-21cp20:20:013
3298869994437,5cyclictest3409083-21latency_hist20:55:001
3298867994440,3cyclictest3538560-21gpgv23:00:000
3298869994337,4cyclictest252-21systemd-journal22:44:441
3298867994238,3cyclictest3334940-21kworker/u8:1+flush-259:019:45:160
3298875994136,3cyclictest252-21systemd-journal00:31:413
3298872994136,3cyclictest3475662-21apt-get21:55:202
3298875994036,3cyclictest3456080-21kworker/u8:0+flush-259:021:45:263
3298875994035,3cyclictest252-21systemd-journal22:20:433
3298872994037,2cyclictest3456080-21kworker/u8:0+flush-259:022:10:002
3298875993932,5cyclictest3569756-21latency_hist23:30:013
3298872993934,3cyclictest252-21systemd-journal20:27:092
3298867993932,5cyclictest3334396-21ntpq19:40:200
3298867993731,5cyclictest3605738-21latency_hist00:05:000
3298872993631,4cyclictest3563732-21ntpq23:20:212
3298875993530,4cyclictest3554289-21latency_hist23:15:003
3298869993530,3cyclictest3371996-21gpgv20:20:001
3298867993528,5cyclictest3606161-21diskstats00:05:160
3298875993430,3cyclictest3502358-21kworker/u8:2+flush-259:022:35:243
3298869993428,4cyclictest252-21systemd-journal22:52:331
3298875993326,5cyclictest3398783-21latency_hist20:45:003
3298869993320,11cyclictest3350334-21ntpq19:55:211
3298867993326,5cyclictest3393655-21latency_hist20:40:000
3298872993127,3cyclictest3502358-21kworker/u8:2+flush-259:022:25:002
3298872993127,3cyclictest3335587-21apt-get19:45:122
3298869993125,5cyclictest3570025-21apt-get23:30:121
3298867993127,2cyclictest211rcuc/021:35:000
3298872993027,2cyclictest3456080-21kworker/u8:0+flush-259:022:05:002
3298867993024,4cyclictest3502595-21apt-get22:25:090
3298875992925,3cyclictest3626323-21apt-get00:25:003
3298875992925,3cyclictest3334940-21kworker/u8:1+events_unbound20:20:163
3298867992925,3cyclictest3424574-21kworker/u8:3+flush-259:022:15:440
3298875992824,3cyclictest3408727-21kworker/u8:3+flush-259:020:55:243
3298872992822,5cyclictest3444230-21ntpq21:25:222
3298872992822,5cyclictest3444230-21ntpq21:25:222
3298872992822,4cyclictest3497169-21latency_hist22:20:012
3298869992822,4cyclictest3487151-21apt-get22:10:121
3298867992824,3cyclictest3512640-21kworker/u8:5+flush-259:023:00:180
3298867992824,2cyclictest3340486-21kworker/u8:3+events_unbound20:10:170
3298867992823,4cyclictest3388121-21apt-get20:35:010
3298867992822,4cyclictest3314674-21diskstats19:25:130
3298875992724,2cyclictest3507737-21apt-get22:30:123
3298872992722,3cyclictest252-21systemd-journal21:01:432
3298872992721,4cyclictest3460132-21ntpq21:40:202
3298872992721,4cyclictest3377372-21latency_hist20:25:012
3298872992721,4cyclictest3303973-21latency_hist19:15:012
3298869992720,5cyclictest3626323-21apt-get00:25:021
3298867992723,3cyclictest3512640-21kworker/u8:5+events_unbound23:17:380
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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