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2026-05-17 - 10:45

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #6

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
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rackeslot6s.osadl.org (updated Sun May 17, 2026 00:44:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
80467199787,34cyclictest0-21swapper/020:30:010
804671997669,5cyclictest131ktimers/022:10:010
804671997333,3cyclictest831559-21/usr/sbin/munin21:45:190
804671997322,46cyclictest0-21swapper/022:15:000
804671996719,41cyclictest823724-21cat21:00:010
804671996719,14cyclictest840735-21cat22:40:010
804674996415,19cyclictest14-21rcu_preempt22:15:011
804674996415,19cyclictest14-21rcu_preempt22:15:011
804671996326,10cyclictest0-21swapper/023:35:020
804671996326,10cyclictest0-21swapper/023:35:010
804671996325,34cyclictest836759-21/usr/sbin/munin22:15:210
804671996325,34cyclictest836759-21/usr/sbin/munin22:15:210
804671996323,4cyclictest861071-21irqstats00:35:230
804671996318,39cyclictest0-21swapper/000:25:160
804671996225,33cyclictest807167-21phc2sys-jitter19:20:250
804671996122,35cyclictest812211-21phc2sys19:50:250
804671996024,2cyclictest855198-21/usr/sbin/munin00:00:270
804671995929,27cyclictest824685-21df21:05:170
804671995918,3cyclictest815315-21df_inode20:10:160
804671995830,3cyclictest845982-21/usr/sbin/munin23:10:170
804671995821,3cyclictest806030-21diskstats19:15:180
804671995815,3cyclictest809410-21diskstats19:35:180
804671995752,3cyclictest0-21swapper/020:35:140
804671995723,5cyclictest827620-21find21:20:270
804671995637,14cyclictest131ktimers/022:40:120
804671995636,14cyclictest0-21swapper/000:15:150
804671995628,26cyclictest833479-21phc2sys21:55:270
804671995621,9cyclictest820571-21tune2fs20:40:200
804671995621,32cyclictest832485-21fschecks_time21:50:190
804674995546,5cyclictest838876-21munin-plugin-st22:30:001
80467199554,26cyclictest0-21swapper/000:15:010
804671995528,3cyclictest810838-21munin-run19:45:010
804671995527,3cyclictest853004-21df_inode23:50:180
804671995520,8cyclictest852244-21sh23:45:200
804671995520,8cyclictest852244-21sh23:45:200
804671995520,31cyclictest848905-21/usr/sbin/munin23:25:260
804671995520,31cyclictest848905-21/usr/sbin/munin23:25:260
80467199551,5cyclictest0-21swapper/021:30:100
80467199551,5cyclictest0-21swapper/021:30:100
80467499541,8cyclictest0-21swapper/121:35:191
804671995437,11cyclictest0-21swapper/019:45:140
804671995431,13cyclictest0-21swapper/021:15:140
804671995427,25cyclictest853856-21/usr/sbin/munin23:55:200
804671995426,3cyclictest839398-21phc2sys22:30:250
804671995426,3cyclictest839398-21phc2sys22:30:250
804671995337,13cyclictest0-21swapper/023:00:120
804671995334,14cyclictest0-21swapper/021:00:130
80467199533,2cyclictest0-21swapper/020:25:020
804671995324,3cyclictest808566-21df_inode19:30:310
804671995234,12cyclictest0-21swapper/020:15:140
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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