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2026-08-28 - 08:15

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 Fri Aug 28, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
122621270,2sleep01228-21date21:20:020
842221150,2sleep08423-21/usr/sbin/munin19:40:260
244821100,3sleep02385-21/usr/sbin/munin23:30:150
2482821080,3sleep024867-21load20:45:180
1982521020,3sleep019894-21/usr/sbin/munin22:30:280
1939421020,3sleep019432-21latency_hist20:25:010
53252950,4sleep05339-21cat21:35:190
135042850,3sleep013564-21switchtime20:00:270
68632820,2sleep06864-21/usr/sbin/munin19:35:200
87072810,3sleep08763-21latency_hist23:55:010
32507998050,18cyclictest9475-21ntp_states19:45:220
32507997956,14cyclictest6325-21/usr/sbin/munin23:45:140
32507997956,14cyclictest14708-21/usr/sbin/munin20:05:280
32507997949,19cyclictest31229-21/usr/sbin/munin21:10:140
32507997857,12cyclictest16243-21runrttasks22:16:590
32507997749,17cyclictest5265-21ntp_states23:40:220
32507997749,17cyclictest17206-21ntp_states20:15:220
39262760,2sleep03925-21ntp_kernel_pll_23:35:190
32507997651,15cyclictest11361-21cat00:05:020
32507997548,15cyclictest7788-21df_inode21:45:140
32507997548,14cyclictest890-21chrt23:24:260
32507997542,20cyclictest28601-21/usr/sbin/munin21:00:110
129482750,4sleep012997-21ls20:00:020
32507997451,13cyclictest1-21systemd22:05:020
32507997449,14cyclictest10961-21sort19:50:250
32507997448,15cyclictest12951-21df22:05:130
32507997448,14cyclictest15222-21sshd22:14:100
32507997447,19cyclictest30013-21/usr/sbin/munin23:10:240
32507997440,21cyclictest15360-21df00:20:120
3129927419,31sleep031300-21sshd19:05:080
32507997351,12cyclictest1467-21chrt21:20:170
32507997350,15cyclictest17864-21runrttasks00:30:070
32507997348,15cyclictest32187-21ls23:20:020
32507997347,16cyclictest29491-21runrttasks23:09:390
32507997347,15cyclictest2756-21memory21:25:180
32507997346,16cyclictest23365-21irqstats22:45:180
32507997346,15cyclictest551-21/usr/sbin/munin19:10:260
32507997343,18cyclictest19562-21fgrep00:35:260
32507997340,20cyclictest1384-21ntp_states23:25:210
32507997337,21cyclictest16779-21memory00:25:180
32507997249,13cyclictest2299-21runrttasks19:17:360
32507997247,14cyclictest18258-21memory22:25:220
32507997246,15cyclictest19816-21ntp_states20:25:210
32507997246,14cyclictest29904-21df21:05:140
32507997239,21cyclictest216-21rs:main0
32507997239,18cyclictest26021-21df_inode20:50:130
32507997149,14cyclictest9831-21runrttasks23:58:500
32507997149,14cyclictest23520-21if_eth020:40:160
32507997147,14cyclictest20620-21runrttasks22:35:080
32507997147,13cyclictest3917-21df_inode21:30:140
32507997145,16cyclictest10356-21df_inode21:55:140
32507997144,15cyclictest25843-21df_inode22:55:140
32507997049,13cyclictest20949-21runrttasks20:30:160
32507997043,16cyclictest4499-21mailstats19:25:260
32507997043,16cyclictest276-21runrttasks23:05:020
32507997042,15cyclictest17363-21cat22:20:300
32507996946,14cyclictest23294-21latency_hist20:40:010
32507996945,13cyclictest12662-21cut00:10:020
32507996944,15cyclictest25244-21runrttasks22:51:370
32507996944,14cyclictest9075-21df_inode21:50:140
32507996943,15cyclictest22196-21seq22:40:200
32507996845,13cyclictest15826-21memory20:10:180
32507996844,14cyclictest14055-21/usr/sbin/munin00:15:140
32507996844,13cyclictest6516-21cut19:35:020
32507996842,15cyclictest28468-21latency_hist21:00:020
32507996841,16cyclictest276-21runrttasks00:14:020
32507996743,13cyclictest6510-21df_inode21:40:140
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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