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2026-09-18 - 03:41

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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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 20 highest latencies:
System rackeslot4s.osadl.org (updated Fri Sep 18, 2026 00:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3219546995552,2cyclictest3354279-21kworker/u8:3+flush-259:021:35:241
3219546995451,2cyclictest3495483-21gpgv23:35:011
3219544995448,4cyclictest3495285-21latency_hist23:35:010
3219544994642,3cyclictest3230044-21apt-get19:20:120
3219546994439,4cyclictest3276595-21apt-get20:05:121
3219544994439,4cyclictest3235221-21apt-get19:25:120
3219554994338,3cyclictest3417720-21apt-get22:20:113
3219549994339,3cyclictest3219728-21apt-get19:10:112
3219544994337,4cyclictest3297634-21cp20:25:010
3219544994137,3cyclictest3484777-21store23:25:000
3219554994036,3cyclictest3422679-21kworker/u8:1+flush-259:022:30:273
3219549994034,5cyclictest3547374-21latency_hist00:25:002
3219549993935,3cyclictest3276224-21kworker/u8:1+flush-259:020:05:242
3219544993935,3cyclictest3276224-21kworker/u8:1+flush-259:020:40:250
3219549993733,3cyclictest3276224-21kworker/u8:1+flush-259:020:45:252
3219544993732,4cyclictest3412562-21apt-get22:15:110
3219546993633,2cyclictest3422679-21kworker/u8:1+events_unbound22:30:211
3219546993632,3cyclictest3239762-21kworker/u8:0+events_unbound21:15:241
3219544993631,3cyclictest3422679-21kworker/u8:1+flush-259:022:30:230
3219544993531,3cyclictest3469099-21kworker/u8:1+flush-259:023:40:170
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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