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2026-01-05 - 11:01

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 100 highest latencies:
System rack1slot6s.osadl.org (updated Mon Jan 05, 2026 00:43:33)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
23960991057,51cyclictest890-21awk23:38:220
239659910440,13cyclictest0-21swapper/223:13:232
23966991005,87cyclictest0-21swapper/323:43:333
2396099994,52cyclictest0-21swapper/023:03:230
2396099994,52cyclictest0-21swapper/023:03:230
2396599984,48cyclictest5439-21grep21:29:022
2396599984,48cyclictest5439-21grep21:29:022
2396599973,47cyclictest7065-21latency_hist22:43:252
2396599963,44cyclictest0-21swapper/223:38:362
23966999535,12cyclictest0-21swapper/300:03:543
23966999533,12cyclictest0-21swapper/323:18:233
2396699953,52cyclictest1287-21snmpd19:04:543
23960999430,13cyclictest0-21swapper/000:03:400
2396099943,7cyclictest9510-21latency_hist20:33:300
23965999036,12cyclictest0-21swapper/222:28:582
23966998936,11cyclictest0-21swapper/320:29:073
23965998931,12cyclictest0-21swapper/200:13:362
23965998928,12cyclictest0-21swapper/220:48:302
23965998928,12cyclictest0-21swapper/220:48:302
2396599884,52cyclictest6210-21munin-node19:18:562
23965998829,12cyclictest0-21swapper/200:03:512
2396699874,48cyclictest6089-21cut22:38:503
2396599813,49cyclictest0-21swapper/223:23:232
248599660,5rtkit-daemon2484-21rtkit-daemon23:27:260
2396699665,53cyclictest1419-21runrttasks22:28:433
23966996638,12cyclictest0-21swapper/321:53:553
23965996538,12cyclictest0-21swapper/219:28:572
23966996441,8cyclictest29136-21sendmail_mailqu20:04:013
23966996441,8cyclictest29136-21sendmail_mailqu20:04:013
23966996436,12cyclictest0-21swapper/323:03:553
2396699633,53cyclictest0-21swapper/322:23:373
23965996340,9cyclictest20887-21cpuspeed_turbos19:48:472
2396599634,52cyclictest0-21swapper/222:23:512
23965996336,12cyclictest0-21swapper/221:53:432
23965996336,10cyclictest11096-21rt-features22:48:582
2396599633,53cyclictest10916-21munin-node21:43:452
2396699624,51cyclictest22424-21fschecks_time20:58:473
23966996236,12cyclictest0-21swapper/320:38:293
23966996235,12cyclictest0-21swapper/322:33:523
23966996234,13cyclictest0-21swapper/319:53:463
23965996239,8cyclictest447-21grep21:19:012
23965996233,12cyclictest0-21swapper/222:33:522
2396599623,52cyclictest0-21swapper/219:23:432
2396599623,52cyclictest0-21swapper/219:23:432
2396599622,46cyclictest0-21swapper/222:55:392
23960996233,13cyclictest0-21swapper/023:43:380
23966996139,7cyclictest30955-21munin-run23:33:223
23966996136,11cyclictest0-21swapper/322:08:263
23965996139,10cyclictest0-21swapper/219:04:052
23965996134,12cyclictest0-21swapper/219:34:022
128042613,49sleep10-21swapper/119:29:171
248599600,4rtkit-daemon2484-21rtkit-daemon19:33:500
2396699603,51cyclictest0-21swapper/318:53:343
2396499606,33cyclictest0-21swapper/121:10:121
2396499605,33cyclictest0-21swapper/121:58:591
2396099603,51cyclictest0-21swapper/020:08:530
2396099603,51cyclictest0-21swapper/020:08:530
23965995934,9cyclictest30223-21yum-updatesd-he23:28:552
2396499597,45cyclictest0-21swapper/121:33:471
2396499596,13cyclictest0-21swapper/123:58:501
2396499595,29cyclictest0-21swapper/100:03:521
2396499594,32cyclictest0-21swapper/121:43:391
23960995932,12cyclictest0-21swapper/018:48:480
23960995930,13cyclictest0-21swapper/019:08:320
23966995835,11cyclictest0-21swapper/321:03:433
23966995834,9cyclictest14630-21proc_pri21:48:563
23966995834,11cyclictest0-21swapper/321:13:503
23966995834,11cyclictest0-21swapper/320:25:063
23966995833,11cyclictest0-21swapper/322:58:533
23966995833,11cyclictest0-21swapper/322:58:533
23966995832,11cyclictest0-21swapper/319:29:063
2396699583,49cyclictest0-21swapper/319:58:513
23966995823,28cyclictest27006-21df_abs21:08:443
2396699582,51cyclictest0-21swapper/318:59:083
23965995837,8cyclictest9924-21rt-features21:38:572
2396599582,51cyclictest0-21swapper/221:13:482
2396499586,31cyclictest0-21swapper/123:44:431
2396499586,31cyclictest0-21swapper/119:52:181
2396499585,32cyclictest0-21swapper/123:08:471
2396499585,31cyclictest0-21swapper/122:38:451
2396499585,29cyclictest0-21swapper/122:08:491
2396499584,32cyclictest0-21swapper/121:40:171
2396499583,49cyclictest0-21swapper/119:00:421
23960995834,9cyclictest41ktimersoftd/019:19:030
157562586,44sleep30-21swapper/320:44:003
157562586,44sleep30-21swapper/320:44:003
23966995735,8cyclictest18357-21sendmail_mailqu20:48:583
23966995735,8cyclictest18357-21sendmail_mailqu20:48:583
2396699572,50cyclictest0-21swapper/322:53:373
2396699572,50cyclictest0-21swapper/318:58:343
2396599574,47cyclictest13311-21basename21:48:392
23965995732,11cyclictest0-21swapper/220:03:512
23965995732,11cyclictest0-21swapper/220:03:512
2396599573,48cyclictest5028-21telnet20:23:392
2396599572,50cyclictest0-21swapper/223:43:352
2396499575,31cyclictest0-21swapper/122:20:081
2396499575,28cyclictest0-21swapper/122:49:021
2396499574,31cyclictest0-21swapper/122:23:391
2396499574,13cyclictest0-21swapper/122:08:261
2396099574,47cyclictest0-21swapper/022:29:020
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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