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2026-08-27 - 10:48

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #1

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.

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 rack4slot1s.osadl.org (updated Thu Aug 27, 2026 00:44:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
673421390,4sleep1281ktimers/123:44:131
673421390,4sleep1281ktimers/123:44:131
1759121190,3sleep10-21swapper/100:14:041
2295621040,2sleep10-21swapper/120:09:021
1450421020,1sleep114502-21grep19:44:251
64832910,3sleep19778-21kworker/1:0+mm_percpu_wq22:15:081
64832910,3sleep19778-21kworker/1:0+mm_percpu_wq22:15:081
26032860,2sleep10-21swapper/122:04:231
26032860,2sleep10-21swapper/122:04:231
112252550,2chrt10011-21/usr/sbin/munin19:34:241
274162520,2sleep0171ktimers/023:14:010
274162520,2sleep0171ktimers/023:14:010
194362480,3sleep20-21swapper/221:24:162
214462440,2sleep021571-21gltestperf20:04:110
256522430,2sleep30-21swapper/300:34:123
256522430,2sleep30-21swapper/300:34:123
106682430,3sleep2351rcuc/219:34:172
323822390,3sleep30-21swapper/321:59:153
323822390,3sleep30-21swapper/321:59:153
282832390,1sleep3431rcuc/323:14:163
282832390,1sleep3431rcuc/323:14:163
227672390,4chrt0-21swapper/222:59:202
227672390,4chrt0-21swapper/222:59:202
227672390,4chrt0-21swapper/222:59:202
106592390,2sleep010684-21latency_hist22:29:030
304922370,3chrt0-21swapper/121:54:141
2960993731,4cyclictest15145-21sed00:04:241
2960993731,4cyclictest15145-21sed00:04:241
181512370,3sleep30-21swapper/321:19:233
181512370,3sleep30-21swapper/321:19:233
181512370,3sleep30-21swapper/321:19:233
119992370,2sleep20-21swapper/219:39:122
119992370,2sleep20-21swapper/219:39:122
220502360,3sleep20-21swapper/200:24:182
220502360,3sleep20-21swapper/200:24:182
2960993529,4cyclictest572-21cups-browsed00:34:181
2960993529,4cyclictest572-21cups-browsed00:34:181
2959993530,3cyclictest28478-21latency_hist20:24:000
2959993530,3cyclictest28478-21latency_hist20:24:000
2959993422,10cyclictest0-21swapper/023:44:000
2959993422,10cyclictest0-21swapper/023:44:000
2959993422,10cyclictest0-21swapper/023:44:000
171332340,3sleep20-21swapper/222:44:162
171332340,3sleep20-21swapper/222:44:162
134222340,3sleep30-21swapper/321:09:143
134222340,3sleep30-21swapper/321:09:143
2960993328,4cyclictest1346-21avahi-daemon20:34:211
2960993327,5cyclictest8281-21netstat20:54:181
2959993326,5cyclictest31211-21missed_timers20:29:160
2959993326,5cyclictest18917-21sshd19:56:090
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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