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2026-04-30 - 03:04

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, 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 50 highest latencies:
System rack0slot5s.osadl.org (updated Thu Apr 30, 2026 00:45:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
7649942386365,12sleep120-21swapper/1219:05:374
7650072360311,38sleep80-21swapper/819:05:4914
7652072348322,17sleep30-21swapper/319:08:419
7651392347319,18sleep70-21swapper/719:07:4113
7651412346303,16sleep90-21swapper/919:07:4415
7651652344317,17sleep150-21swapper/1519:08:067
7650132342316,17sleep140-21swapper/1419:05:556
7651532339314,16sleep40-21swapper/419:07:5410
7652412338311,17sleep10-21swapper/119:09:121
7650052338312,17sleep60-21swapper/619:05:4712
7651982336311,16sleep110-21swapper/1119:08:333
7650682336310,17sleep100-21swapper/1019:06:402
7652802335309,17sleep50-21swapper/519:09:4811
7652702335310,16sleep130-21swapper/1319:09:405
7652772334305,18sleep20-21swapper/219:09:458
7651872334317,11sleep00-21swapper/019:08:220
765685994426,1cyclictest1561-21snmpd23:02:205
765656994039,1cyclictest0-21swapper/623:04:1312
76563999400,0cyclictest0-21swapper/119:59:351
765693993938,1cyclictest0-21swapper/1523:49:507
765650993939,0cyclictest0-21swapper/419:22:2610
76569399387,30cyclictest0-21swapper/1520:11:167
765650993838,0cyclictest0-21swapper/421:18:4310
76566499370,37cyclictest0-21swapper/823:55:5414
765656993736,1cyclictest0-21swapper/622:30:5112
765687993535,0cyclictest0-21swapper/1423:49:506
765670993535,0cyclictest0-21swapper/919:59:3615
765693993433,1cyclictest1561-21snmpd00:13:197
765645993434,0cyclictest0-21swapper/319:20:519
76569399339,13cyclictest0-21swapper/1500:23:537
76569399338,25cyclictest0-21swapper/1500:34:527
76569399338,25cyclictest0-21swapper/1500:34:527
765670993333,0cyclictest0-21swapper/921:46:5115
765661993333,0cyclictest0-21swapper/722:30:5113
765656993333,0cyclictest0-21swapper/619:24:4312
765654993333,0cyclictest0-21swapper/519:41:2811
76569399327,14cyclictest0-21swapper/1522:12:057
765685993232,0cyclictest0-21swapper/1323:40:355
765672993226,6cyclictest0-21swapper/1023:59:122
76569399316,14cyclictest0-21swapper/1520:33:147
765687993131,0cyclictest0-21swapper/1400:19:126
765685993131,0cyclictest0-21swapper/1319:41:295
765680993125,3cyclictest0-21swapper/1222:28:454
765654993131,0cyclictest0-21swapper/523:33:5611
76569399306,14cyclictest0-21swapper/1521:06:117
76569399306,14cyclictest0-21swapper/1521:06:117
765656993030,0cyclictest0-21swapper/622:03:5312
76565699300,1cyclictest0-21swapper/621:21:3112
765654993030,0cyclictest0-21swapper/521:35:5411
765639993029,1cyclictest0-21swapper/100:03:391
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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