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2026-04-09 - 08:59

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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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 Apr 09, 2026 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1275922400,2sleep012761-21idleruntime-cro22:30:000
1308422370,3sleep013087-21cpu20:25:120
181321960,3sleep01811-21ls21:45:280
658221170,3chrt6583-21latency_hist20:00:020
1086521160,2sleep010862-21grep20:15:250
760121150,4chrt7597-21munin-run22:10:000
2898121120,4chrt28980-21/usr/sbin/munin21:25:250
2731821080,3chrt27315-21latency_hist19:15:010
1615721070,4sleep016214-21users20:35:270
2886121040,3sleep028862-21if_eth019:20:140
283921020,3sleep02843-21ntp_states21:50:230
185722980,3sleep018639-21mailstats20:45:240
156692960,4sleep015726-21ntp_kernel_err22:40:180
78032950,2sleep07801-21idleruntime22:10:150
299402905,9sleep029991-21irqstats21:30:140
41382880,3sleep04207-21wc00:00:260
269862885,10sleep026975-21latency_hist23:25:020
207042860,4sleep020721-21fw_packets23:00:160
7722800,4sleep0773-21sshd23:48:380
179392760,3sleep017937-21grep22:50:010
2510827419,33sleep025121-21ntp_states19:05:180
181252740,3sleep018171-21/usr/sbin/munin22:50:140
6852670,2sleep0688-21sort19:35:280
26041996126,14cyclictest28285-21latency_hist23:30:010
26041996012,17cyclictest19556-21df20:50:120
26041996011,15cyclictest9176-21/usr/sbin/munin20:10:240
26041996010,17cyclictest5359-21/usr/sbin/munin00:05:260
2604199599,17cyclictest2359-21/usr/sbin/munin23:55:190
2604199599,17cyclictest23504-21seq23:10:220
2604199599,17cyclictest10318-21/usr/sbin/munin22:20:140
26041995934,16cyclictest9033-21/usr/sbin/munin00:20:160
2604199589,19cyclictest20848-21sh20:55:130
2604199589,16cyclictest22219-21ntp_states23:05:230
2604199589,15cyclictest12030-21ntpq20:20:200
2604199588,17cyclictest32444-21/usr/sbin/munin21:40:180
2604199587,18cyclictest1439-21/usr/sbin/munin19:40:250
26041995836,16cyclictest24556-21runrttasks21:10:010
26041995834,15cyclictest25271-21/usr/sbin/munin21:10:280
26041995833,15cyclictest26448-21/usr/sbin/munin21:15:270
26041995811,16cyclictest14431-21/usr/sbin/munin20:30:130
26041995811,14cyclictest3835-21grep21:55:110
26041995810,22cyclictest31307-21/usr/sbin/munin19:30:090
26041995810,18cyclictest29947-21ntpq23:35:190
2604199579,17cyclictest31183-21sh19:30:020
2604199579,16cyclictest15341-21munin-run22:40:010
2604199579,13cyclictest1371-21ntp_states23:50:220
2604199578,17cyclictest10192-21sendmail22:20:000
2604199578,16cyclictest16936-21/usr/sbin/munin20:40:130
2604199578,15cyclictest7894-21/usr/sbin/munin20:05:150
2604199577,16cyclictest13290-21wc22:30:260
26041995733,15cyclictest28779-21/usr/sbin/munin23:30:250
26041995729,20cyclictest6175-21runrttasks19:57:480
26041995712,14cyclictest2978-21ntpq19:45:190
26041995710,14cyclictest31423-21ntp_states21:35:210
2604199567,15cyclictest27422-21/usr/sbin/munin19:15:160
2604199567,15cyclictest10132-21/usr/sbin/munin00:25:150
26041995633,14cyclictest31974-21runrttasks23:43:450
26041995629,16cyclictest5201-21/usr/sbin/munin22:00:120
26041995612,15cyclictest7717-21memory00:15:180
26041995610,31cyclictest19392-21df22:55:190
26041995610,16cyclictest12397-21sshd00:33:390
2604199558,15cyclictest6462-21cat00:10:170
2604199558,15cyclictest288-21snmpd19:51:130
2604199557,16cyclictest12694-21/usr/sbin/munin00:35:150
26041995531,16cyclictest28172-21runrttasks21:22:490
26041995432,15cyclictest22935-21runrttasks21:02:210
26041995431,15cyclictest25537-21runrttasks23:19:030
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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