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2025-12-22 - 15:55

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 Mon Dec 22, 2025 12:44:13)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2256082995638,14cyclictest2371924-21latency_hist09:05:010
2256092995240,10cyclictest2361878-21cp08:55:012
23942932510,3sleep3575-21kworker/3:2+events09:29:033
2256088995143,6cyclictest2272677-21kworker/u8:2+flush-8:007:49:131
2256088995043,5cyclictest2570441-21kworker/u8:1+flush-8:012:39:131
2256088994943,4cyclictest2297623-21kworker/u8:3+events_unbound08:39:141
2256088994939,7cyclictest2406372-21latency_hist09:40:011
2256082994838,7cyclictest2505488-21latency_hist11:20:010
2256088994742,3cyclictest2401458-21kworker/u8:3+flush-8:009:44:141
2256088994740,5cyclictest2470524-21kworker/u8:0+events_unbound11:09:131
225608299473,38cyclictest0-21swapper/010:48:530
2256082994723,21cyclictest2307450-21latency_hist08:00:010
2256082994527,15cyclictest278-21systemd-journal10:20:000
2256092994333,7cyclictest278-21systemd-journal07:25:002
225115224328,10sleep10-21swapper/107:05:371
2256092994231,8cyclictest2366940-21awk09:00:002
2256088994135,4cyclictest2386896-21kworker/u8:2+flush-8:010:45:011
2256092994028,9cyclictest278-21systemd-journal12:14:122
2256092994028,9cyclictest278-21systemd-journal12:14:112
2256088994036,3cyclictest2515784-21kworker/u8:1+flush-8:011:53:581
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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