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2026-05-25 - 11:04

OSADL QA Farm on Real-time of Mainline Linux

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

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 100 highest latencies:
System rackeslot5s.osadl.org (updated Mon May 25, 2026 00:44:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1601992623,2cyclictest20514-21grep22:30:012
160199261,1cyclictest28-21ksoftirqd/222:02:302
1591992626,0cyclictest27266-21diskmemload21:40:460
1603992523,1cyclictest27266-21diskmemload21:53:353
1603992523,1cyclictest0-21swapper/322:30:193
160399250,24cyclictest6715-21ssh23:14:383
1601992523,1cyclictest0-21swapper/221:34:572
160199252,22cyclictest31599-21ssh22:39:402
160199250,24cyclictest27266-21diskmemload00:03:492
160199250,23cyclictest313-21systemd-journal19:20:012
160199250,23cyclictest313-21systemd-journal19:20:012
159799250,24cyclictest24150-21taskset00:27:471
159799250,0cyclictest0-21swapper/121:37:301
159199250,24cyclictest4069-21rm22:43:440
159199250,24cyclictest27266-21diskmemload23:56:170
160399242,21cyclictest17682-21ssh21:30:183
160399240,23cyclictest27266-21diskmemload23:06:283
160399240,23cyclictest27266-21diskmemload23:01:403
160399240,23cyclictest14254-21ssh23:49:463
160399240,23cyclictest0-21swapper/300:17:553
160399240,23cyclictest0-21swapper/300:10:363
160399240,1cyclictest27266-21diskmemload22:37:513
1601992423,1cyclictest0-21swapper/223:02:212
1601992422,2cyclictest0-21swapper/223:50:002
1601992421,2cyclictest18870-21diskmemload23:53:182
1601992421,2cyclictest13360-21ssh23:20:012
1601992421,2cyclictest0-21swapper/223:18:002
160199241,0cyclictest28-21ksoftirqd/223:33:322
160199240,23cyclictest27266-21diskmemload22:40:532
160199240,23cyclictest27266-21diskmemload21:26:092
160199240,23cyclictest0-21swapper/223:40:192
160199240,23cyclictest0-21swapper/221:54:342
160199240,23cyclictest0-21swapper/221:38:482
160199240,23cyclictest0-21swapper/200:26:542
1597992421,2cyclictest7658-21ssh23:43:411
159799240,24cyclictest27266-21diskmemload23:26:561
159799240,24cyclictest0-21swapper/100:39:561
159799240,23cyclictest27266-21diskmemload22:51:371
159799240,1cyclictest0-21swapper/121:14:591
159799240,0cyclictest0-21swapper/121:31:491
1591992423,1cyclictest27266-21diskmemload21:34:490
1591992422,0cyclictest151rcu_preempt00:21:410
159199241,23cyclictest27266-21diskmemload23:50:360
159199240,24cyclictest0-21swapper/022:53:220
159199240,24cyclictest0-21swapper/021:37:390
159199240,24cyclictest0-21swapper/000:00:090
159199240,23cyclictest13-21ksoftirqd/022:22:170
159199240,23cyclictest0-21swapper/022:47:170
159199240,0cyclictest0-21swapper/023:21:320
1603992323,0cyclictest27266-21diskmemload22:55:463
1603992323,0cyclictest27266-21diskmemload21:15:023
1603992323,0cyclictest0-21swapper/323:55:093
1603992323,0cyclictest0-21swapper/323:24:413
1603992323,0cyclictest0-21swapper/300:21:063
1603992321,1cyclictest0-21swapper/322:27:233
1603992321,1cyclictest0-21swapper/322:20:343
1603992321,1cyclictest0-21swapper/322:06:373
1603992321,1cyclictest0-21swapper/321:35:353
1603992320,2cyclictest32051-21ssh22:12:153
1603992320,2cyclictest20129-21diskmemload23:26:383
1603992320,2cyclictest16129-21ssh21:28:303
1603992320,2cyclictest13999-21sh21:55:333
160399230,23cyclictest27266-21diskmemload00:29:423
160399230,22cyclictest27266-21diskmemload23:30:323
160399230,1cyclictest27266-21diskmemload23:35:303
160399230,0cyclictest16888-21apt-get23:52:593
160399230,0cyclictest0-21swapper/321:24:503
160399230,0cyclictest0-21swapper/321:13:453
1601992323,0cyclictest0-21swapper/223:14:352
1601992323,0cyclictest0-21swapper/223:06:092
1601992323,0cyclictest0-21swapper/222:45:322
1601992323,0cyclictest0-21swapper/221:56:252
1601992322,1cyclictest0-21swapper/223:25:252
1601992321,1cyclictest0-21swapper/222:21:082
1601992321,1cyclictest0-21swapper/221:12:162
1601992321,1cyclictest0-21swapper/200:07:332
160199231,2cyclictest0-21swapper/200:21:072
160199230,2cyclictest5601-21sh22:17:452
160199230,2cyclictest29938-21sh00:32:542
160199230,22cyclictest5238-21sh00:38:172
160199230,22cyclictest24640-21sh23:58:272
160199230,22cyclictest23222-21awk19:55:002
160199230,22cyclictest19488-21ssh22:58:002
160199230,22cyclictest13298-21rm22:52:452
160199230,22cyclictest0-21swapper/200:10:082
160199230,0cyclictest0-21swapper/223:37:202
1597992323,0cyclictest27266-21diskmemload22:59:541
1597992323,0cyclictest0-21swapper/122:37:461
1597992323,0cyclictest0-21swapper/121:25:101
1597992323,0cyclictest0-21swapper/100:23:271
1597992323,0cyclictest0-21swapper/100:16:021
1597992323,0cyclictest0-21swapper/100:06:311
1597992321,1cyclictest0-21swapper/121:00:011
159799231,1cyclictest25106-21sh22:33:351
159799230,2cyclictest7504-21ssh21:21:531
159799230,23cyclictest27266-21diskmemload22:49:071
159799230,23cyclictest0-21swapper/123:15:401
159799230,23cyclictest0-21swapper/122:15:211
159799230,22cyclictest901-21ssh21:15:211
159799230,22cyclictest29346-21ssh23:06:031
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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