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2025-09-18 - 14:28

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 10 highest latencies:
System rack5slot4s.osadl.org (updated Thu Sep 18, 2025 12:44:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
130382722020,3sleep3662-21kworker/3:2+events09:30:553
12419022730,3chrt662-21kworker/3:2-events08:30:483
12111112560,4sleep10-21swapper/108:00:411
1159372995546,6cyclictest1180931-21latency_hist07:30:011
1159368995444,6cyclictest2583070-21systemd-journal09:55:000
1159372995039,8cyclictest1393657-21ntpq11:00:531
1159368995040,7cyclictest1419398-21apt-get11:30:000
1159372994940,6cyclictest1225587-21latency_hist08:15:001
1159372994839,7cyclictest2583070-21systemd-journal07:39:151
1159368994842,4cyclictest1469431-21apt-get12:20:440
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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