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2025-11-24 - 19:45

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 Mon Nov 24, 2025 12:44:17)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
20087642135121,9sleep60-21swapper/607:06:156
20089132132116,10sleep70-21swapper/707:08:267
20089662131103,9sleep50-21swapper/507:09:115
20089272128113,10sleep30-21swapper/307:08:383
20087202127113,9sleep00-21swapper/007:05:380
20089632125106,10sleep20-21swapper/207:09:092
20088872123108,10sleep10-21swapper/107:08:041
20088252120104,10sleep40-21swapper/407:07:114
2009272991020,100cyclictest0-21swapper/712:17:147
2009272991020,100cyclictest0-21swapper/711:06:567
2009266991020,99cyclictest0-21swapper/509:01:225
200926199102100,2cyclictest546-21snmpd09:16:074
20092579910299,3cyclictest546-21snmpd11:07:403
20092579910299,3cyclictest546-21snmpd10:14:393
2009272991010,99cyclictest0-21swapper/708:46:387
2009272991010,101cyclictest0-21swapper/708:35:187
2009272991010,100cyclictest0-21swapper/711:36:097
2009269991010,99cyclictest0-21swapper/612:39:076
20092669910199,1cyclictest597-21lldpd09:11:415
20092669910198,3cyclictest546-21snmpd11:49:075
20092669910195,2cyclictest546-21snmpd09:21:195
200926699101100,1cyclictest546-21snmpd11:16:225
2009266991010,101cyclictest0-21swapper/509:54:215
2009266991010,101cyclictest0-21swapper/507:54:555
20092619910199,2cyclictest546-21snmpd12:30:014
20092619910199,2cyclictest546-21snmpd09:10:584
20092619910199,2cyclictest546-21snmpd08:04:384
20092619910198,3cyclictest546-21snmpd11:01:354
20092579910199,2cyclictest546-21snmpd11:13:503
20092579910199,2cyclictest546-21snmpd08:15:013
20092579910199,2cyclictest546-21snmpd07:24:183
20092579910198,3cyclictest546-21snmpd09:18:073
20092579910198,2cyclictest546-21snmpd10:15:263
20092529910199,2cyclictest546-21snmpd09:58:332
20092529910199,1cyclictest597-21lldpd10:01:412
2009252991010,100cyclictest0-21swapper/207:29:202
20092499910199,2cyclictest546-21snmpd09:18:251
2009249991010,100cyclictest0-21swapper/108:41:091
2009249991010,100cyclictest0-21swapper/108:41:091
20092449910199,2cyclictest546-21snmpd07:36:220
2009244991010,99cyclictest0-21swapper/011:06:410
2009244991010,101cyclictest0-21swapper/012:30:140
2009244991010,101cyclictest0-21swapper/012:29:440
2009244991010,0cyclictest0-21swapper/009:28:230
2009272991000,99cyclictest0-21swapper/709:45:387
2009272991000,99cyclictest0-21swapper/709:13:037
2009272991000,100cyclictest0-21swapper/710:50:037
2009272991000,100cyclictest0-21swapper/709:58:127
2009272991000,100cyclictest0-21swapper/709:21:377
2009272991000,100cyclictest0-21swapper/708:20:537
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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