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2026-09-14 - 23:35

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 highest latencies:
System rack4slot6s.osadl.org (updated Mon Sep 14, 2026 12:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2107922620,3sleep021078-21wc12:35:190
75522600,3sleep0753-21grep09:10:250
1753122410,4sleep017533-21switchtime12:20:260
2780521500,2sleep027806-21if_eth008:50:140
820921300,3chrt8203-21munin-run07:35:000
958621290,2sleep09585-21latency_hist07:40:020
965321260,2sleep09656-21sort09:45:190
3193021200,3chrt31933-21processes09:05:250
2130521170,4chrt21309-21netstat10:30:180
175421050,3sleep01765-21cyclictest07:10:020
3256121040,3sleep032626-21latency_hist11:15:020
81821000,3sleep032675-21/usr/sbin/munin11:15:330
2049221000,3sleep020490-21grep08:20:270
1771999667,18cyclictest19367-21sshd10:22:380
1771999469,14cyclictest12200-21/usr/sbin/munin07:50:300
1771999367,14cyclictest11745-21seq12:00:010
1771999355,24cyclictest6889-21memory11:40:190
1771999169,14cyclictest20226-21runrttasks12:30:390
1771999163,14cyclictest25332-21missed_timers08:40:170
1771999065,15cyclictest4169-21df_inode11:30:130
1771999063,15cyclictest23744-21seq10:40:130
1771998964,15cyclictest27696-21runrttasks10:55:180
1771998962,15cyclictest25896-21chrt10:48:210
1771998962,15cyclictest14721-21ntp_states12:10:220
229942880,3sleep022995-21sshd10:35:470
1771998863,16cyclictest27154-21seq08:46:380
1771998862,16cyclictest29091-21if_eth008:55:130
1771998862,14cyclictest3548-21/usr/sbin/munin07:15:250
1771998861,16cyclictest31196-21runrttasks09:02:570
1771998860,17cyclictest15396-21seq10:06:530
1771998860,15cyclictest13619-21ntp_states10:00:210
1771998859,18cyclictest1-21systemd11:25:380
1771998858,18cyclictest13400-21ntpq12:05:180
1771998858,17cyclictest14793-21/usr/sbin/munin08:00:300
1771998852,21cyclictest30717-21seq11:05:310
1771998762,15cyclictest17182-21/usr/sbin/munin10:15:290
1771998761,15cyclictest22722-21memory08:30:170
1771998761,14cyclictest4665-21/usr/sbin/munin07:20:170
1771998758,19cyclictest22349-21runrttasks08:29:360
1771998663,13cyclictest8271-21ntp_states11:45:210
1771998662,14cyclictest16730-21seq12:18:490
1771998660,15cyclictest3298-21ntp_states09:20:220
1771998660,14cyclictest5442-21df11:35:130
1771998659,15cyclictest16144-21chrt08:05:130
1771998658,16cyclictest11206-21ntpq07:45:210
1771998657,17cyclictest6202-21sshd09:30:380
1771998657,15cyclictest14080-21/usr/sbin/munin07:55:290
1771998651,22cyclictest288-21snmpd10:25:210
1771998562,13cyclictest8036-21munin-run09:40:010
1771998561,14cyclictest17782-21mailstats08:10:250
1771998561,13cyclictest19915-21cat08:20:010
1771998560,13cyclictest29217-21/usr/sbin/munin11:00:250
1771998559,16cyclictest9623-21seq07:40:060
1771998559,15cyclictest307-21munin-node08:35:260
1771998548,23cyclictest10736-21/usr/sbin/munin09:50:130
1771998459,14cyclictest26349-21cat10:50:130
1771998458,15cyclictest7016-21cut07:30:010
1771998360,14cyclictest12944-21chrt12:04:260
1771998360,13cyclictest9343-21awk11:50:140
1771998359,15cyclictest16608-21runrttasks10:11:180
1771998356,15cyclictest8759-21users09:40:270
1771998350,21cyclictest13193-21systemctl10:00:000
1771998248,21cyclictest1873-21/usr/sbin/munin07:10:110
1771998158,15cyclictest2436-21runrttasks11:22:530
1771998157,14cyclictest4358-21df_inode09:25:130
1771998148,22cyclictest1692-21egrep09:15:100
1771998049,17cyclictest18505-21memory12:25:190
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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