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2025-12-27 - 13:19

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #b, slot #8

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 rackbslot8s (updated Sat Dec 27, 2025 00:44:19)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
11035492129113,10sleep30-21swapper/319:05:423
11035482127112,10sleep20-21swapper/219:05:412
11036212126111,10sleep10-21swapper/119:06:441
11037822125107,9sleep50-21swapper/519:09:055
11035592125111,9sleep40-21swapper/419:05:514
11037282124108,10sleep70-21swapper/719:08:187
11035462124109,9sleep00-21swapper/019:05:390
11037182117102,9sleep60-21swapper/619:08:096
1104071991030,100cyclictest0-21swapper/022:00:150
1104094991020,100cyclictest0-21swapper/623:05:136
1104079991020,100cyclictest0-21swapper/220:55:112
11040719910299,2cyclictest556-21snmpd20:30:230
1104099991010,100cyclictest0-21swapper/722:47:547
1104099991010,100cyclictest0-21swapper/721:43:557
11040949910199,2cyclictest556-21snmpd23:40:566
11040949910199,2cyclictest556-21snmpd23:20:576
11040949910199,2cyclictest556-21snmpd22:21:466
11040949910199,2cyclictest556-21snmpd21:26:436
11040949910199,2cyclictest556-21snmpd21:26:426
11040949910198,3cyclictest556-21snmpd22:56:546
1104094991010,101cyclictest0-21swapper/622:04:446
11040929910199,2cyclictest556-21snmpd22:26:455
11040929910199,1cyclictest593-21lldpd21:33:585
11040929910198,2cyclictest556-21snmpd23:53:075
1104092991010,100cyclictest0-21swapper/500:00:155
11040889910199,2cyclictest556-21snmpd21:24:144
1104088991010,100cyclictest0-21swapper/420:57:544
11040839910198,3cyclictest556-21snmpd22:17:553
11040799910199,2cyclictest556-21snmpd20:42:172
110407599101100,0cyclictest556-21snmpd21:51:221
11040719910198,3cyclictest556-21snmpd20:49:340
1104099991000,99cyclictest0-21swapper/723:05:407
1104099991000,99cyclictest0-21swapper/721:54:457
1104099991000,99cyclictest0-21swapper/719:36:297
1104099991000,99cyclictest0-21swapper/719:31:057
1104099991000,99cyclictest0-21swapper/700:06:207
11040949910099,1cyclictest556-21snmpd22:45:486
11040949910099,1cyclictest556-21snmpd20:36:406
11040949910098,2cyclictest556-21snmpd21:30:376
11040949910098,2cyclictest556-21snmpd19:31:346
1104094991000,99cyclictest0-21swapper/622:53:576
1104094991000,99cyclictest0-21swapper/620:25:556
1104094991000,100cyclictest0-21swapper/622:11:506
1104094991000,100cyclictest0-21swapper/600:32:456
11040929910099,1cyclictest556-21snmpd22:44:185
11040929910099,1cyclictest556-21snmpd22:14:475
11040929910099,1cyclictest556-21snmpd20:15:135
11040929910099,1cyclictest556-21snmpd19:49:425
11040929910099,1cyclictest556-21snmpd19:28:465
11040929910099,1cyclictest556-21snmpd00:35:105
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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