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2026-06-09 - 09:10

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #3

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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Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

Data to construct the above plot have been generated using the RT test utility cyclictest.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack5slot3s.osadl.org (updated Tue Jun 09, 2026 00:44:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
12832241165,24sleep20-21swapper/219:09:192
12872232157,25sleep10-21swapper/119:09:221
11222229162,54sleep30-21swapper/319:07:143
11312202165,25sleep00-21swapper/019:07:190
2204721650,3sleep1142799cyclictest23:35:121
2084221350,1sleep30-21swapper/321:05:133
69212570,2sleep3143899cyclictest21:45:213
100182490,3sleep20-21swapper/200:20:162
142799411,11cyclictest9091-21sh00:20:021
142799391,35cyclictest27295-21cpuspeed_turbos21:20:111
142199391,27cyclictest17886-21tune2fs23:25:150
142199380,24cyclictest22837-21sed23:35:190
143299371,9cyclictest23371-21grep23:35:242
143299371,6cyclictest31721-21kworker/u8:122:45:162
143299371,6cyclictest31721-21kworker/u8:122:45:162
143299371,5cyclictest18820-21turbostat22:15:022
142799375,8cyclictest20397-21latency_hist21:05:011
142799372,32cyclictest17991-21grep22:10:221
142799371,33cyclictest15690-21munin-run00:35:021
142799371,32cyclictest28470-21runrttasks20:09:231
142799371,10cyclictest14929-21vmstat19:35:281
142199371,33cyclictest2725-21/usr/sbin/munin00:05:250
142199371,26cyclictest19013-21cat22:15:010
143299362,5cyclictest16626-21munin-run22:10:022
142799362,5cyclictest0-21swapper/123:30:181
142799362,4cyclictest31639-21hwlatdetect20:15:171
142199364,24cyclictest0-21swapper/021:50:160
142199362,23cyclictest27231-21cat23:45:190
142199361,28cyclictest24957-21latency_hist21:15:010
142199361,26cyclictest15243-21unixbench_multi00:30:240
142199361,24cyclictest15207-21grep22:05:140
142199361,19cyclictest3823-21cat19:15:010
143299354,3cyclictest0-21swapper/222:00:132
143299351,9cyclictest18422-21/usr/sbin/munin21:00:112
143299351,7cyclictest29415-21grep22:35:252
143299351,3cyclictest12050irq/123-ahci[0023:31:202
1432993511,3cyclictest25641-21/usr/sbin/munin22:30:152
1432993510,3cyclictest19916-21/usr/sbin/munin19:50:182
142799356,2cyclictest24384-21cat20:00:111
142799355,7cyclictest0-21swapper/119:25:311
142799355,3cyclictest87550irq/128-enp1s0-19:42:161
142799351,4cyclictest10661-21perf23:10:011
142799351,3cyclictest17888-21cut23:25:151
1427993512,4cyclictest1809-21cut19:10:131
1427993511,3cyclictest827-21runrttasks22:00:021
142799350,16cyclictest0-21swapper/121:36:031
142799350,16cyclictest0-21swapper/121:36:031
142799350,15cyclictest0-21swapper/100:39:401
142199352,30cyclictest9975-21cut00:20:140
142199352,23cyclictest2448-21chrt00:04:330
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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