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2026-03-10 - 13:01

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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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 Mar 10, 2026 00:44:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
24322240164,24sleep30-21swapper/319:06:213
24322240164,24sleep30-21swapper/319:06:213
27062238164,23sleep20-21swapper/219:09:552
27062238164,23sleep20-21swapper/219:09:552
25542237162,24sleep10-21swapper/119:07:571
25542237162,24sleep10-21swapper/119:07:561
24642235162,60sleep00-21swapper/019:06:480
24642235162,60sleep00-21swapper/019:06:480
1622321360,4sleep3281599cyclictest22:05:123
2815997774,2cyclictest0-21swapper/323:41:393
2815997774,2cyclictest0-21swapper/323:41:393
145692660,2sleep30-21swapper/323:15:113
16342550,1sleep20-21swapper/200:00:012
14542530,5sleep07-21ksoftirqd/023:59:190
222502490,4sleep123-21ksoftirqd/121:05:151
52832480,4sleep1221ktimersoftd/121:40:151
157472450,4sleep121-21rcuc/100:30:181
2798993910,13cyclictest19163-21munin-run00:40:010
279899389,13cyclictest16653-21munin-run19:40:020
206012370,4sleep0279899cyclictest21:00:160
279899368,13cyclictest11937-21awk23:10:010
18592340,3sleep1280499cyclictest21:30:231
279899313,13cyclictest16973-21awk00:35:010
279899291,13cyclictest32047-21munin-run20:15:010
280499281,19cyclictest0-21swapper/123:03:241
280499281,17cyclictest3991-21awk21:35:231
279899276,7cyclictest29123-21users23:45:260
279899274,10cyclictest30126-21fschecks_count23:50:140
264682270,2sleep10-21swapper/123:40:221
264682270,2sleep10-21swapper/123:40:221
280499266,11cyclictest0-21swapper/122:35:221
319732250,2sleep3401ktimersoftd/321:25:243
319732250,2sleep3401ktimersoftd/321:25:233
281599251,9cyclictest0-21swapper/323:02:193
2815992516,5cyclictest24454-21sort23:35:233
280499257,5cyclictest16326-21awk23:20:011
280499251,17cyclictest0-21swapper/121:15:231
280499251,16cyclictest0-21swapper/122:25:581
279899250,7cyclictest0-21swapper/023:23:130
47982240,2sleep09-21rcu_preempt21:40:020
281599241,21cyclictest0-21swapper/322:40:243
280499245,8cyclictest0-21swapper/122:21:181
280499241,4cyclictest4977-21perf19:15:001
2804992412,3cyclictest5960-21chrt20:26:031
280499241,17cyclictest0-21swapper/120:51:241
280499241,16cyclictest0-21swapper/122:05:071
280499241,16cyclictest0-21swapper/121:46:361
280499241,15cyclictest0-21swapper/122:15:141
280499241,14cyclictest0-21swapper/122:49:381
280499241,11cyclictest19167-21turbostat00:40:001
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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