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2025-05-02 - 12:57

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #3

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 rack5slot3s.osadl.org (updated Fri May 02, 2025 00:44:33)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
111092238164,24sleep30-21swapper/319:09:583
109492231154,25sleep20-21swapper/219:07:562
109222221152,55sleep00-21swapper/019:07:340
107792203165,25sleep10-21swapper/119:05:421
2587921730,3sleep21120999cyclictest22:05:312
306022600,2sleep10-21swapper/123:30:281
11209996057,2cyclictest0-21swapper/222:27:012
228532590,4sleep21120999cyclictest19:35:012
146442460,3sleep121-21rcuc/121:40:291
209962450,2sleep00-21swapper/019:30:140
11215993512,11cyclictest25057-21awk19:40:013
1121599344,22cyclictest0-21swapper/321:19:163
155452330,4sleep121-21rcuc/119:15:251
11215993315,4cyclictest6206-21/usr/sbin/munin22:35:233
11209993321,2cyclictest11116-21kworker/2:123:40:222
1121599328,15cyclictest4883-21timerandwakeup23:45:283
1121599319,10cyclictest8196-21/usr/sbin/munin21:25:303
1121599319,10cyclictest8196-21/usr/sbin/munin21:25:303
11215993111,7cyclictest780-21rngd20:35:233
1121599309,5cyclictest11405-21/usr/sbin/munin19:10:223
1121599309,5cyclictest11405-21/usr/sbin/munin19:10:223
1121599309,11cyclictest32423-21grep22:20:283
1121599305,13cyclictest0-21swapper/323:11:333
1120999302,12cyclictest11116-21kworker/2:121:50:142
1121599298,12cyclictest31249-21latency_hist23:35:013
1121599297,14cyclictest0-21swapper/300:35:213
1121599295,14cyclictest1702-21/usr/sbin/munin20:00:153
11215992919,6cyclictest15815-40dnf22:59:333
1121599291,8cyclictest0-21swapper/321:40:193
11215992912,9cyclictest25246-21diskstats23:20:163
1119999294,12cyclictest32242-21diskmemload23:55:010
1121599289,11cyclictest623-21/usr/sbin/munin22:25:223
1121599288,13cyclictest0-21swapper/321:58:153
1121599286,10cyclictest14435-21taskset20:27:133
1121599284,9cyclictest0-21swapper/323:00:183
1121599283,17cyclictest0-21swapper/300:25:193
11215992818,6cyclictest27707-40dnf20:58:323
11215992818,6cyclictest10100-40dnf00:00:113
11215992815,5cyclictest780-21rngd20:48:033
1121599281,11cyclictest30126-21cat22:15:273
11215992810,14cyclictest24964-21hddtemp_smartct22:05:193
11209992810,3cyclictest11116-21kworker/2:120:07:122
1120599281,17cyclictest0-21swapper/100:35:231
1121599279,7cyclictest11705-21/usr/sbin/munin22:50:143
1121599279,5cyclictest0-21swapper/321:35:253
1121599278,6cyclictest23323-21/usr/sbin/munin00:30:293
1121599276,9cyclictest18305-21/usr/sbin/munin23:05:283
1121599274,15cyclictest9363-21cat22:45:023
11215992719,5cyclictest10843-21diskstats20:20:183
11215992719,5cyclictest10843-21diskstats20:20:183
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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