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2026-06-27 - 21:16

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 20 highest latencies:
System rack5slot4s.osadl.org (updated Sat Jun 27, 2026 12:44:19)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
157081023440,3sleep375-21kworker/3:1+events08:00:243
151689021800,5sleep3451irq_work/307:05:333
16848452980,1sleep11684851-21tr09:55:221
16319312910,2chrt0-21swapper/009:00:230
1517706996459,4cyclictest1658138-21kworker/u8:1+events_unbound10:15:331
1517700995950,6cyclictest1668452-21latency_hist09:40:000
1517700995547,6cyclictest1629042-21kworker/u8:0+flush-8:009:10:320
1517706995347,5cyclictest1718705-21kworker/u8:2+flush-8:011:00:301
1517706995247,4cyclictest1742441-21kworker/u8:0+flush-8:011:05:351
1517706995247,4cyclictest1658138-21kworker/u8:1+flush-8:010:10:301
1517706995238,11cyclictest1704890-21systemd-journal10:06:271
1517706995044,4cyclictest1466061-21kworker/u8:2+flush-8:007:25:261
1517706995043,5cyclictest1658138-21kworker/u8:1+flush-8:010:35:181
1517708994938,9cyclictest1704890-21systemd-journal12:15:272
1517706994943,4cyclictest1629042-21kworker/u8:0+flush-8:009:15:311
1517706994943,4cyclictest1584000-21latency_hist08:15:011
1517706994943,4cyclictest1584000-21latency_hist08:15:001
1517706994938,8cyclictest1704890-21systemd-journal09:33:271
1517700994940,7cyclictest1847971-21cp12:40:000
1517706994844,3cyclictest1475054-21kworker/u8:3+events_unbound08:15:341
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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