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2026-05-02 - 05:48

OSADL QA Farm on Real-time of Mainline Linux

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

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.

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 rackaslot5s.osadl.org (updated Sat May 02, 2026 00:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811110,0rcu_preempt18822-21ssh22:53:440
811050,0rcu_preempt3-21ksoftirqd/000:29:360
811000,0rcu_preempt3-21ksoftirqd/023:09:430
81890,0rcu_preempt19-21ksoftirqd/122:23:381
81800,0rcu_preempt3-21ksoftirqd/022:12:280
81760,0rcu_preempt3-21ksoftirqd/021:16:470
81750,0rcu_preempt3-21ksoftirqd/023:32:520
81750,0rcu_preempt3-21ksoftirqd/022:50:200
81740,0rcu_preempt3-21ksoftirqd/023:43:100
81740,0rcu_preempt3-21ksoftirqd/022:23:350
81740,0rcu_preempt3-21ksoftirqd/021:39:450
81740,0rcu_preempt3-21ksoftirqd/021:25:240
81720,0rcu_preempt3-21ksoftirqd/023:45:360
81710,0rcu_preempt54-21kswapd000:15:210
81710,0rcu_preempt3-21ksoftirqd/021:10:220
81700,0rcu_preempt3-21ksoftirqd/000:20:060
3544997011,0cyclictest22709-21dropbear00:03:340
81680,0rcu_preempt3-21ksoftirqd/023:23:140
81680,0rcu_preempt3-21ksoftirqd/023:03:320
81680,0rcu_preempt3-21ksoftirqd/022:58:550
81670,0rcu_preempt9215-21df_abs21:03:270
81670,0rcu_preempt19-21ksoftirqd/100:13:421
354499676,0cyclictest0-21swapper/022:38:090
354499676,0cyclictest0-21swapper/022:38:090
81660,0rcu_preempt3-21ksoftirqd/023:33:320
354499661,0cyclictest27449-21awk00:08:260
354499661,0cyclictest1470-21runrttasks21:28:450
81650,0rcu_preempt8718-21ssh22:43:390
81650,0rcu_preempt3-21ksoftirqd/023:16:070
81650,0rcu_preempt19-21ksoftirqd/123:48:291
3544996514,0cyclictest0-21swapper/022:17:320
354499651,0cyclictest15142-21apt-get23:23:260
354499642,0cyclictest6824-21ping19:43:270
354499641,0cyclictest6824-21ping19:28:240
354499641,0cyclictest6824-21ping19:28:240
354499641,0cyclictest2526350kworker/0:2H22:07:410
81630,0rcu_preempt3-21ksoftirqd/019:48:340
81630,0rcu_preempt19-21ksoftirqd/123:47:561
81630,0rcu_preempt11889-21apt-get19:33:251
354499636,0cyclictest19569-1kworker/0:0H00:34:530
354499632,0cyclictest6824-21ping19:24:570
354499632,0cyclictest13284-21runrttasks00:26:330
81610,0rcu_preempt3-21ksoftirqd/023:48:320
81610,0rcu_preempt26668-21munin-node1
354499612,0cyclictest0-21swapper/021:18:400
3544996113,0cyclictest0-21swapper/022:01:370
81600,0rcu_preempt19-21ksoftirqd/123:58:261
354499602,0cyclictest0-21swapper/022:42:470
3544996014,0cyclictest0-21swapper/020:58:390
81590,0rcu_preempt3-21ksoftirqd/023:58:240
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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