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2026-08-12 - 12:25

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 Wed Aug 12, 2026 00:44:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2452200998075,4cyclictest75-21kswapd000:35:023
2452189994642,3cyclictest2452391-21kworker/u8:3+flush-259:019:20:220
2452189994639,5cyclictest2535717-21latency_hist20:30:000
2452194994135,4cyclictest2608473-21latency_hist21:39:591
2452197993832,4cyclictest2676109-21latency_hist22:45:012
2452197993731,4cyclictest335557-21systemd-journal22:33:462
2452194993734,2cyclictest75-21kswapd000:35:031
2452189993730,5cyclictest2775646-21diskstats00:20:140
2452189993730,5cyclictest2503436-21ntpq19:55:220
2452200993630,4cyclictest2685999-21ntpq22:50:223
2452197993629,5cyclictest2462490-21latency_hist19:20:022
2452194993633,2cyclictest2676135-21kworker/u8:2+flush-259:022:55:211
2452194993630,4cyclictest2623984-21http21:55:001
2452189993631,3cyclictest335557-21systemd-journal21:20:480
2452189993529,4cyclictest2452391-21kworker/u8:3+flush-259:019:15:200
2452200993429,3cyclictest2468325-21kworker/u8:4+flush-259:020:40:153
2452189993428,4cyclictest2702632-21/usr/sbin/munin23:10:210
2452189993327,4cyclictest2509572-21kworker/u8:2+flush-259:020:20:170
2452194993229,2cyclictest2644853-21kworker/u8:3+events_unbound22:25:121
2452194993228,2cyclictest2670836-21kworker/u8:1+flush-259:022:50:251
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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