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2026-06-04 - 09:53

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, 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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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 rackeslot3s.osadl.org (updated Thu Jun 04, 2026 00:45:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
301741099845,63cyclictest3055314-21ssh22:20:022
301740599801,62cyclictest3068788-21ssh22:50:021
3017405997425,12cyclictest275-21dbus-daemon22:45:021
301741099709,42cyclictest3023634-21diskmemload22:35:032
3017405997055,6cyclictest3032825-21ssh21:30:041
3017405997055,6cyclictest3032825-21ssh21:30:031
3017402996821,28cyclictest12-21ksoftirqd/021:40:010
3017417996640,18cyclictest3467602-21systemd-journal20:50:003
3017402996526,34cyclictest16850irq/134-800000021:50:020
3017402996517,3cyclictest131rcu_preempt21:15:270
3017405996430,7cyclictest3109088-21sendmail00:20:001
3017405996330,9cyclictest3467602-21systemd-journal22:36:321
3017405996327,11cyclictest23-21ksoftirqd/100:09:031
3017417996136,20cyclictest275-21dbus-daemon21:35:013
3017417996136,20cyclictest275-21dbus-daemon21:35:013
3017405996024,12cyclictest23-21ksoftirqd/100:25:121
301740299603,23cyclictest131rcu_preempt22:21:480
3017402995929,14cyclictest3085905-21ssh23:28:090
3017402995929,14cyclictest3085905-21ssh23:28:090
3017402995928,14cyclictest3052373-21ssh22:13:460
3017402995928,14cyclictest3052373-21ssh22:13:460
3017410995827,11cyclictest3017869-21cat19:20:002
3017405995840,14cyclictest1-21systemd20:10:011
3017402995831,23cyclictest3467602-21systemd-journal00:00:000
3017417995735,12cyclictest3046132-21sh22:00:003
3017402995728,13cyclictest3023903-21ssh21:10:050
3017402995728,13cyclictest3023903-21ssh21:10:050
3017402995726,15cyclictest3075423-21ssh23:05:020
301740299572,28cyclictest131rcu_preempt00:29:220
301741799564,7cyclictest131rcu_preempt22:50:013
3017402995626,14cyclictest3070377-21ssh22:53:380
3017410995546,6cyclictest3021822-21kworker/2:021:20:012
3017402995533,17cyclictest275-21dbus-daemon21:55:020
3017402995527,12cyclictest3117849-21ssh00:39:220
3017402995527,12cyclictest3049034-21ssh22:06:060
301740299552,24cyclictest131rcu_preempt22:17:130
3017402995519,32cyclictest16850irq/134-800000022:30:440
3017417995436,14cyclictest3467602-21systemd-journal20:30:013
3017402995422,3cyclictest131rcu_preempt00:17:320
3017402995418,18cyclictest16850irq/134-800000023:35:500
3017410995315,5cyclictest131rcu_preempt23:00:002
301740299538,29cyclictest12-21ksoftirqd/022:30:000
301740299533,3cyclictest131rcu_preempt22:36:530
3017402995326,12cyclictest3083212-21ssh23:22:140
3017402995318,5cyclictest16850irq/134-800000021:32:350
3017402995318,5cyclictest16850irq/134-800000021:32:350
3017402995318,18cyclictest16850irq/134-800000022:47:110
3017402995318,17cyclictest16850irq/134-800000023:54:440
3017402995316,6cyclictest16850irq/134-800000022:56:200
3017417995224,19cyclictest275-21dbus-daemon20:55:003
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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