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2026-08-14 - 23:15

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #1, slot #6

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.
Unexpectedly long latencies may be caused by SMIs
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 50 highest latencies:
System rack1slot6s.osadl.org (updated Fri Aug 14, 2026 12:43:33)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
20167991064,57cyclictest0-21swapper/210:02:172
2194991000,6rtkit-daemon2193-21rtkit-daemon09:37:193
201659910037,11cyclictest0-21swapper/109:07:141
2016599994,27cyclictest0-21swapper/108:17:281
2016599983,27cyclictest12830-21gltestperf06:47:271
2016799964,55cyclictest0-21swapper/210:38:292
2016599954,26cyclictest31625-21forks10:02:161
2016099943,13cyclictest0-21swapper/010:42:170
2016599936,29cyclictest0-21swapper/109:52:181
2016599936,29cyclictest0-21swapper/109:52:181
2016599936,26cyclictest0-21swapper/109:27:291
2016599926,28cyclictest0-21swapper/111:04:461
2016099925,13cyclictest0-21swapper/008:12:260
2016599914,32cyclictest17973-21wc08:02:371
20165999133,13cyclictest0-21swapper/108:58:361
2016599905,40cyclictest0-21swapper/110:57:221
2016599905,37cyclictest0-21swapper/110:27:261
20165999035,11cyclictest29698-21munin-run06:17:081
2016099902,67cyclictest0-21swapper/011:08:590
20160999012,6cyclictest0-21swapper/009:00:230
2016599886,28cyclictest0-21swapper/109:02:311
20165998836,14cyclictest0-21swapper/110:41:561
20165998719,14cyclictest0-21swapper/111:17:121
2016099875,13cyclictest0-21swapper/010:40:390
2016099875,12cyclictest0-21swapper/009:32:560
20160998717,55cyclictest32188-21wc10:02:230
267392860,4sleep3361ktimersoftd/310:42:303
2016099864,15cyclictest0-21swapper/009:07:180
2016099863,63cyclictest0-21swapper/009:58:180
2016099863,62cyclictest0-21swapper/007:58:560
2016099863,60cyclictest0-21swapper/008:45:250
2016099863,10cyclictest8580-21ssh10:17:080
2016599856,27cyclictest0-21swapper/111:16:091
2016599856,27cyclictest0-21swapper/111:16:091
2016599855,28cyclictest0-21swapper/108:16:411
2016099859,8cyclictest0-21swapper/008:37:170
2016099859,8cyclictest0-21swapper/008:37:170
2016099857,11cyclictest0-21swapper/011:13:590
2016099857,11cyclictest0-21swapper/011:13:590
20165998435,14cyclictest0-21swapper/110:07:251
2016099845,64cyclictest0-21swapper/008:24:380
2016099844,73cyclictest0-21swapper/011:02:290
2016099844,60cyclictest0-21swapper/009:53:260
2016099844,60cyclictest0-21swapper/009:53:260
2016099843,74cyclictest0-21swapper/009:51:580
2016099843,74cyclictest0-21swapper/009:02:180
20160998418,59cyclictest0-21swapper/010:27:260
20160998413,55cyclictest0-21swapper/008:47:270
2016099833,8cyclictest17221-21gltestperf08:02:230
2016099833,14cyclictest0-21swapper/011:00:300
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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