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2026-06-25 - 04:23

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, 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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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: 50 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 792 highest latencies:
System rack4slot6s.osadl.org (updated Thu Jun 25, 2026 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1800722840,3sleep018009-21latency_hist20:30:020
1661222080,2sleep016614-21missed_timers00:35:200
169721450,4chrt1695-21users21:30:280
2421021300,3chrt24204-21munin-run23:00:010
297589912529,16cyclictest11960-21/usr/sbin/munin20:05:240
545521240,4chrt5452-21ntp_states19:40:220
297589912431,15cyclictest12808-21/usr/sbin/munin00:20:190
297589912131,16cyclictest9554-21runrttasks00:07:490
297589912122,18cyclictest9056-21df19:55:110
297589912030,15cyclictest30481-21runrttasks21:17:020
297589911927,15cyclictest7916-21/usr/sbin/munin19:50:180
2490021190,3sleep024898-21cat23:00:280
297589911830,17cyclictest32231-21irqstats23:30:150
297589911633,74cyclictest13158-21/usr/sbin/munin20:10:200
297589911628,15cyclictest8441-21runrttasks00:04:140
297589911628,13cyclictest6482-21netstat21:50:180
297589911626,17cyclictest21358-21runrttasks22:47:500
297589911624,16cyclictest10056-21/usr/sbin/munin00:10:150
297589911610,19cyclictest18065-21memory22:35:170
297589911529,13cyclictest22263-21/usr/sbin/munin20:45:250
297589911528,15cyclictest11205-21runrttasks22:09:170
297589911528,13cyclictest22995-21latency_hist22:55:020
297589911528,13cyclictest20485-21runrttasks20:39:590
2619821140,3chrt26196-21timerwakeupswit23:05:270
297589911327,14cyclictest2429-21/usr/sbin/munin23:40:180
297589911326,13cyclictest15742-21netstat20:20:200
297589911324,14cyclictest9944-21runrttasks22:04:280
297589911322,15cyclictest19716-21timerandwakeup22:40:260
29758991127,23cyclictest4925-21seq19:39:250
29758991126,11cyclictest58412sleep021:47:380
297589911227,15cyclictest15310-21/usr/sbin/munin00:30:180
297589911220,15cyclictest32744-21ntp_states19:20:210
297589911219,17cyclictest2089-21readlink23:40:000
29758991118,30cyclictest12588-21munin-run22:15:000
297589911125,14cyclictest276-21runrttasks21:21:390
297589911124,14cyclictest26980-21idleruntime-cro21:05:010
297589911030,15cyclictest30345-21runrttasks23:22:160
297589911024,14cyclictest14025-21runrttasks22:20:110
297589911023,14cyclictest4338-21runrttasks23:47:240
297589911022,15cyclictest27776-21runrttasks23:12:360
297589911021,16cyclictest14944-21runrttasks20:16:520
297589911021,15cyclictest21456-21runrttasks20:42:090
297589911012,16cyclictest13978-21irqstats00:25:160
297589911011,23cyclictest12247-21sshd00:18:480
297589910924,13cyclictest276-21runrttasks20:51:410
297589910923,13cyclictest10721-21sendmail_mailqu20:00:250
297589910922,15cyclictest30879-21runrttasks23:25:130
297589910919,14cyclictest8528-21sshd21:58:380
297589910911,22cyclictest31142-21/usr/sbin/munin19:15:260
29758991089,28cyclictest2011-21seq19:26:300
29758991089,14cyclictest18058-21/usr/sbin/munin20:30:310
297589910824,12cyclictest276-21runrttasks21:10:040
297589910822,14cyclictest25760-21latency_hist21:00:020
297589910818,15cyclictest3266-21runrttasks19:31:160
297589910812,17cyclictest15359-21df22:25:120
297589910810,19cyclictest6702-21ntpq19:45:200
297589910810,16cyclictest27095-21/usr/sbin/munin21:05:300
297589910719,14cyclictest3855-21latency21:40:170
297589910712,18cyclictest16735-21irqstats22:30:170
297589910711,20cyclictest29382-21munin-run23:20:010
29758991068,17cyclictest6250-21memory23:55:160
29758991067,15cyclictest29833-21cut19:10:020
29758991059,19cyclictest13330-21sshd22:15:380
297589910510,16cyclictest2700-21chrt21:35:250
297589910422,14cyclictest5602-21runrttasks23:52:160
297589910410,16cyclictest30158-21runrttasks19:10:230
297589910410,15cyclictest32571-21ntp_states21:25:220
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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