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2026-06-10 - 22:35

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, 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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  Intel
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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, lowest P state: ondemand
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack5slot4s.osadl.org (updated Wed Jun 10, 2026 12:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
127153422400,3sleep3471rcuc/312:10:333
12367032980,2sleep375-21kworker/3:1-events11:35:013
11619852740,3chrt75-21kworker/3:1+events10:20:003
9874672690,2sleep3471rcuc/307:20:473
9890852580,2sleep3451irq_work/307:25:373
9890852580,2sleep3451irq_work/307:25:363
971105995534,18cyclictest1087794-21/usr/sbin/munin09:05:461
971105995234,16cyclictest1206909-21apt-get11:05:281
971103995241,9cyclictest975069-21ntpq07:10:430
12857732500,5sleep20-21swapper/212:20:462
971105994939,8cyclictest1006780-21ntpq07:40:421
971105994738,7cyclictest1155892-21ntpq10:10:411
971105994737,8cyclictest1260453-21ntpq11:55:441
971105994735,9cyclictest1280185-21ntpq12:15:441
971105994626,18cyclictest1704890-21systemd-journal09:17:001
971105994626,18cyclictest1704890-21systemd-journal09:17:001
971105994534,8cyclictest1704890-21systemd-journal11:01:511
971105994530,13cyclictest1290268-21ntpq12:25:411
971103994433,8cyclictest1240593-21ntpq11:35:420
971105994334,7cyclictest1042455-21cp08:20:011
971105994334,7cyclictest1021629-21ntpq07:55:411
971105994334,6cyclictest1176893-21latency_hist10:35:011
971105994321,19cyclictest1236289-21latency_hist11:35:001
971105994224,16cyclictest1086411-21ntpq09:00:411
971103994034,4cyclictest1037605-21kworker/u8:1+flush-8:009:40:470
971103994033,5cyclictest1246714-21/usr/sbin/munin11:45:420
971103994033,4cyclictest988138-21apt-get07:25:290
971103994033,4cyclictest988138-21apt-get07:25:290
971103994032,6cyclictest1231582-21/usr/sbin/munin11:30:440
971103994029,8cyclictest1096636-21ntpq09:10:420
971103993931,5cyclictest1231342-21true11:30:000
971105993830,6cyclictest1201663-21latency_hist11:00:011
971105993830,6cyclictest1201663-21latency_hist11:00:001
971105993823,13cyclictest1097535-21munin-run09:14:591
971105993818,2cyclictest0-21swapper/107:35:481
971105993817,5cyclictest1704890-21systemd-journal09:40:011
971103993829,6cyclictest1002693-21latency_hist07:40:020
9700442383,30sleep30-21swapper/307:06:113
971105993729,6cyclictest1704890-21systemd-journal10:55:001
971105993727,7cyclictest1704890-21systemd-journal08:00:511
971105993720,15cyclictest0-21swapper/109:50:011
971105993719,15cyclictest0-21swapper/110:05:441
971105993626,8cyclictest1126253-21ntpq09:40:391
971105993620,14cyclictest1166983-21ls10:25:011
971105993617,2cyclictest0-21swapper/108:55:001
971105993616,2cyclictest0-21swapper/107:25:401
971105993616,2cyclictest0-21swapper/107:25:401
971103993632,3cyclictest137713-21kworker/u8:2+events_unbound08:00:360
971103993627,7cyclictest1032122-21kworker/u8:0+flush-8:008:10:340
971103993626,8cyclictest1117802-21diskstats09:35:300
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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