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2025-11-02 - 14:39

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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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 rackbslot8s (updated Sun Nov 02, 2025 00:44:16)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2930423213996,23sleep60-21swapper/619:09:306
29303902134119,9sleep10-21swapper/119:09:011
29283382128113,10sleep40-21swapper/419:05:034
2930422212697,9sleep50-21swapper/519:09:305
29304602125110,10sleep30-21swapper/319:09:593
29303402125110,10sleep70-21swapper/719:08:187
29301992121106,10sleep00-21swapper/019:06:190
2930135211991,10sleep20-21swapper/219:05:252
293070399108108,0cyclictest0-21swapper/322:41:053
29307039910311,0cyclictest2997472-21kworker/3:222:17:593
2930718991020,100cyclictest0-21swapper/719:37:497
29307149910299,3cyclictest546-21snmpd20:47:546
2930714991020,99cyclictest0-21swapper/619:23:366
2930714991020,102cyclictest0-21swapper/622:28:226
2930718991010,99cyclictest0-21swapper/722:52:137
2930718991010,0cyclictest0-21swapper/722:08:367
29307149910199,2cyclictest546-21snmpd23:16:056
29307149910198,3cyclictest546-21snmpd23:32:246
2930714991010,101cyclictest0-21swapper/621:32:316
2930714991010,100cyclictest0-21swapper/622:13:396
2930714991010,100cyclictest0-21swapper/621:50:156
2930714991010,0cyclictest0-21swapper/621:00:516
2930710991010,100cyclictest0-21swapper/520:01:075
2930710991010,100cyclictest0-21swapper/519:25:155
29307079910199,2cyclictest546-21snmpd21:28:114
293070799101100,1cyclictest546-21snmpd21:46:204
293070799101100,1cyclictest546-21snmpd20:52:184
2930707991010,100cyclictest0-21swapper/400:16:134
29307039910199,1cyclictest546-21snmpd19:11:353
2930699991010,100cyclictest0-21swapper/223:33:452
29306909910199,2cyclictest546-21snmpd22:07:010
2930690991010,100cyclictest0-21swapper/021:58:050
2930690991010,100cyclictest0-21swapper/021:30:580
2930718991000,98cyclictest0-21swapper/700:19:197
2930718991000,100cyclictest0-21swapper/723:23:097
2930718991000,100cyclictest0-21swapper/722:46:047
29307149910099,1cyclictest546-21snmpd20:54:396
29307149910099,1cyclictest546-21snmpd00:28:336
29307149910099,1cyclictest0-21swapper/600:34:506
29307149910097,3cyclictest546-21snmpd00:39:026
29307149910097,3cyclictest546-21snmpd00:21:476
2930714991000,100cyclictest0-21swapper/623:39:006
29307109910099,1cyclictest546-21snmpd22:55:525
29307109910099,1cyclictest546-21snmpd22:24:525
29307109910099,1cyclictest546-21snmpd21:14:555
29307109910099,1cyclictest546-21snmpd20:56:245
29307109910099,1cyclictest546-21snmpd20:52:155
29307109910099,1cyclictest546-21snmpd20:48:545
29307109910099,1cyclictest546-21snmpd00:21:235
2930710991000,99cyclictest0-21swapper/519:11:475
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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