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2025-05-02 - 12:56

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, slot #4

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 rack7slot4s.osadl.org (updated Fri May 02, 2025 00:45:17)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
791199711,8cyclictest131rcu_preempt19:35:122
7911995516,18cyclictest27-21ksoftirqd/221:10:162
789999542,47cyclictest16228-21sendmail-msp21:00:181
789999532,39cyclictest15389-21sendmail-msp22:40:141
791899523,32cyclictest25866irq/58-eth000:10:143
789499491,36cyclictest2772-21ssh00:30:150
791199471,2cyclictest131rcu_preempt21:00:172
789999473,37cyclictest30146-21ssh22:10:121
7911994619,19cyclictest27-21ksoftirqd/223:35:142
789999461,37cyclictest17165-21sendmail-msp23:20:151
789499461,34cyclictest23437-21sendmail-msp20:00:150
789499461,34cyclictest23437-21sendmail-msp20:00:150
789999459,28cyclictest21-21ksoftirqd/121:20:201
7918994434,4cyclictest25866irq/58-eth000:15:133
7911994417,20cyclictest900-21snmpd20:50:162
7899994425,16cyclictest21-21ksoftirqd/122:35:131
789499442,33cyclictest4160-21sendmail-msp19:40:200
7911994324,10cyclictest22146irq/40-dwc2_hso19:20:152
7899994330,10cyclictest522-21usb-storage22:20:151
791199422,17cyclictest900-21snmpd00:20:392
789999421,31cyclictest11403-21ssh23:55:131
791199414,32cyclictest22146irq/40-dwc2_hso19:25:142
789999412,25cyclictest2286-21ssh21:15:141
789999410,3cyclictest0-21swapper/121:55:141
789999401,24cyclictest29420-21sendmail-msp20:40:181
789999394,29cyclictest18421-21sendmail-msp23:40:151
789999391,2cyclictest2071-21apt-get20:45:181
789999390,6cyclictest25661-21ssh00:02:171
7894993921,12cyclictest601-21rngd19:35:120
789999382,2cyclictest0-21swapper/120:20:161
791199372,2cyclictest131rcu_preempt23:50:162
789999371,31cyclictest25855-21ssh23:25:141
789999371,11cyclictest137066ssh23:48:021
791899367,14cyclictest25866irq/58-eth021:25:163
7911993617,15cyclictest12970-21sendmail-msp22:00:152
791199361,3cyclictest131rcu_preempt20:35:132
789999364,26cyclictest21735-21ssh22:05:161
789999362,3cyclictest601-21rngd20:05:161
789999361,3cyclictest601-21rngd00:25:151
789999360,5cyclictest9247-21apt-get19:45:181
789499361,28cyclictest17367-21sendmail-msp19:20:140
791199357,16cyclictest27-21ksoftirqd/220:15:162
789999353,29cyclictest16630-21sh23:00:141
791899346,14cyclictest0-21swapper/321:15:133
791899342,19cyclictest25866irq/58-eth020:25:153
791899341,19cyclictest25866irq/58-eth022:15:133
791899341,19cyclictest25866irq/58-eth022:15:133
789999341,2cyclictest24835-21apt-get20:35:131
789999341,2cyclictest14114-21apt-get19:50:141
789999341,25cyclictest25868-21diskmemload00:10:141
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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