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2025-05-02 - 12:42

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, slot #6

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
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack3slot6s.osadl.org (updated Fri May 02, 2025 00:43:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1172521460,5sleep11696899cyclictest21:53:131
2065521240,1sleep20-21swapper/223:40:152
16793211092,12sleep30-21swapper/319:08:073
16909210786,16sleep00-21swapper/019:09:360
16901210480,19sleep20-21swapper/219:09:312
16786210387,11sleep10-21swapper/119:08:011
17632870,0sleep00-21swapper/023:54:410
318262850,1sleep10-21swapper/123:51:011
297252800,0sleep00-21swapper/021:39:010
235272730,0sleep10-21swapper/122:37:421
16969992817,9cyclictest0-21swapper/219:35:122
130122250,2sleep113018-21aten2.4_r3power23:00:151
226692230,0sleep00-21swapper/023:10:070
1696999221,3cyclictest12923-21ssh23:00:142
1696999221,19cyclictest0-21swapper/222:30:122
156582220,1sleep30-21swapper/322:30:133
1696999211,2cyclictest0-21swapper/222:35:132
1696999210,19cyclictest0-21swapper/222:45:132
1696999210,19cyclictest0-21swapper/222:25:142
1696899211,18cyclictest0-21swapper/121:55:121
16967992017,2cyclictest0-21swapper/019:40:190
1696799200,2cyclictest0-21swapper/023:00:140
37882190,0sleep30-21swapper/323:23:293
305052190,1sleep30-21swapper/323:17:233
1696999182,2cyclictest0-21swapper/222:53:042
16968991815,2cyclictest7998-21kworker/u8:120:53:041
1696899180,16cyclictest0-21swapper/121:15:111
1697099171,3cyclictest12493-21ssh22:59:553
1697099171,14cyclictest0-21swapper/321:40:133
16969991714,2cyclictest21419-21kworker/u8:200:35:052
1696999171,13cyclictest0-21swapper/221:16:112
16968991714,2cyclictest783-21kworker/u8:021:47:051
16968991714,2cyclictest12409-21kworker/u8:122:31:031
1697099160,14cyclictest23263-21grep23:10:163
16968991613,2cyclictest2869-21kworker/u8:122:52:051
16968991613,2cyclictest22749-21kworker/u8:219:25:041
16968991613,2cyclictest15862-21kworker/u8:000:10:041
16968991613,2cyclictest12-21rcu_preempt21:10:161
16967991612,2cyclictest8263-21munin-node0
16970991510,3cyclictest10344-21sh23:30:153
1697099150,13cyclictest0-21swapper/321:45:273
1696999151,12cyclictest3745-21runrttasks23:30:052
1696999151,12cyclictest0-21swapper/222:55:282
1696999150,13cyclictest26669-21ssh00:19:492
1696999150,13cyclictest0-21swapper/223:55:162
1696999150,13cyclictest0-21swapper/223:08:042
1696999150,13cyclictest0-21swapper/222:40:052
1696999150,13cyclictest0-21swapper/219:20:132
16968991512,2cyclictest7998-21kworker/u8:120:16:041
16968991512,2cyclictest7959-21kworker/u8:223:12:051
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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