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2026-07-26 - 11:39

OSADL QA Farm on Real-time of Mainline Linux

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

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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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 rackcslot7s.osadl.org (updated Sun Jul 26, 2026 00:44:46)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
199291021310,3sleep33056-21PK-Backend19:35:133
203547421050,5sleep33056-21PK-Backend21:35:153
209765721030,2sleep33056-21PK-Backend00:30:183
198174128147,23sleep10-21swapper/119:05:111
198314528040,15sleep20-21swapper/219:09:272
198316327638,14sleep30-21swapper/319:09:403
198309827639,13sleep00-21swapper/019:08:480
20609282470,3sleep20-21swapper/222:45:222
1983334993328,4cyclictest2061818-21tr22:50:140
1983334993328,4cyclictest2061818-21tr22:50:140
1983348992714,11cyclictest2031394-21unin-run21:25:003
139099270,4rtkit-daemon1389-21rtkit-daemon22:51:441
139099270,4rtkit-daemon1389-21rtkit-daemon22:51:441
139099270,4rtkit-daemon1389-21rtkit-daemon20:46:261
1983334992514,9cyclictest2035473-21diskstats21:35:150
1983348992416,6cyclictest1995311-21python319:40:373
198333999240,23cyclictest1389-21rtkit-daemon20:32:381
20782942230,6sleep10-21swapper/123:35:231
198334899236,4cyclictest2091914-21cat00:15:153
1983343992321,1cyclictest0-21swapper/219:47:432
1983343992315,6cyclictest2068139-21sshd23:07:272
198334399230,3cyclictest2081779-21sed23:45:232
1983334992312,9cyclictest2088167-21cstates00:05:160
20950572220,8sleep342-21ksoftirqd/300:25:013
1983348992214,6cyclictest2015461-21cron20:40:003
1983343992220,1cyclictest0-21swapper/220:21:572
198334399220,21cyclictest0-21swapper/200:14:572
1983339992219,2cyclictest0-21swapper/120:05:171
1983339992216,5cyclictest2047218-21cron22:10:001
198333999220,21cyclictest1389-21rtkit-daemon21:46:131
1983334992220,1cyclictest0-21swapper/023:54:490
1983334992220,1cyclictest0-21swapper/023:49:490
1983334992220,1cyclictest0-21swapper/023:27:320
1983334992220,1cyclictest0-21swapper/023:20:010
1983334992220,1cyclictest0-21swapper/021:05:160
1983334992220,1cyclictest0-21swapper/019:56:550
1983334992220,1cyclictest0-21swapper/000:03:000
198333499220,21cyclictest0-21swapper/021:10:500
198333499220,21cyclictest0-21swapper/000:35:040
198333499220,20cyclictest2068362-21ls23:10:000
139099220,4rtkit-daemon1389-21rtkit-daemon19:49:140
139099220,3rtkit-daemon1389-21rtkit-daemon21:53:561
139099220,3rtkit-daemon1389-21rtkit-daemon21:53:561
139099220,19rtkit-daemon1788643-21eadedCompositor20:38:310
1983348992115,4cyclictest42-21ksoftirqd/319:30:203
198334899210,20cyclictest3056-21PK-Backend22:03:173
198334899210,1cyclictest0-21swapper/322:42:183
198334899210,19cyclictest3056-21PK-Backend22:35:273
198334899210,19cyclictest3056-21PK-Backend21:33:443
1983343992119,1cyclictest0-21swapper/223:53:212
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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