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2026-05-27 - 20:30

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 100 highest latencies:
System rack4slot6s.osadl.org (updated Wed May 27, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1854222560,2sleep018544-21switchtime11:55:250
1833322460,2sleep018334-21idleruntime09:50:130
1694322280,2sleep016939-21cat11:50:160
3025921360,3sleep030261-21fgrep10:35:240
2494421250,4chrt24941-21fgrep12:20:250
2584921220,3chrt25846-21cron10:20:000
690021170,2sleep06899-21ntp_states09:05:200
2622921170,3chrt26227-21fw_packets08:15:140
115321150,4chrt1154-21munin-run10:50:010
1482421120,4sleep014822-21ntp_states07:30:220
948421100,4sleep09488-21ntp_states09:15:210
2321221070,2sleep023214-21sshd10:09:320
2644421040,3sleep026009-21/usr/sbin/munin10:20:260
2212521040,3sleep022152-21awk08:00:000
3038721000,4sleep030456-21mailstats08:30:260
1072121000,4sleep010655-21/usr/sbin/munin07:15:160
155682980,3sleep015613-21/usr/sbin/munin11:45:140
107602960,4sleep010787-21ntp_offset09:20:190
285362880,2sleep028571-21load12:35:170
146972880,2sleep014696-21sort11:40:270
224042860,3sleep022453-21timerandwakeup12:10:260
140502860,4sleep014051-21sshd09:33:320
127622814,8sleep012778-21munin-run11:35:020
53252734,57sleep05332-21cpu09:00:110
195752733,5sleep00-21swapper12:00:180
236552720,2sleep023653-21grep12:15:250
213662710,3sleep021367-21timerandwakeup10:00:270
839426918,31sleep08467-21wc07:05:230
926899629,19cyclictest18621-21missed_timers07:45:190
926899618,23cyclictest4610-21sshd11:01:320
9268996120,15cyclictest8052-21runrttasks09:10:160
9268996035,15cyclictest28778-21/usr/sbin/munin10:30:160
9268996034,16cyclictest4300-21/usr/sbin/munin08:55:210
9268996010,18cyclictest16840-21munin-run09:45:000
926899598,18cyclictest2556-21/usr/sbin/munin10:55:190
926899597,16cyclictest20657-21/usr/sbin/munin12:05:150
9268995932,17cyclictest17311-21/usr/sbin/munin07:40:170
926899589,16cyclictest9090-21egrep11:20:110
926899588,19cyclictest27465-21/usr/sbin/munin08:20:120
926899588,17cyclictest11970-21/usr/sbin/munin07:20:180
926899588,15cyclictest12895-21/usr/sbin/munin11:35:270
926899587,17cyclictest19523-21/usr/sbin/munin09:55:150
9268995834,16cyclictest7989-21/usr/sbin/munin11:15:190
9268995834,15cyclictest9634-21/usr/sbin/munin07:10:190
9268995833,16cyclictest1639-21/usr/sbin/munin08:45:180
9268995832,16cyclictest22881-21/usr/sbin/munin08:00:290
9268995829,21cyclictest24364-21runrttasks08:06:580
9268995819,12cyclictest20879-21sed07:55:010
9268995810,17cyclictest31566-21grep10:40:240
926899579,19cyclictest10606-21ntpq11:25:210
926899578,17cyclictest24922-21df_inode08:10:120
9268995733,15cyclictest6850-21/usr/sbin/munin11:10:250
9268995733,15cyclictest12268-21/usr/sbin/munin09:25:270
9268995731,17cyclictest1536-21/usr/sbin/munin10:50:180
9268995723,13cyclictest276-21runrttasks08:52:070
9268995710,19cyclictest5448-21ntp_states11:05:200
147082570,3sleep014709-21grep09:35:230
926899569,19cyclictest32482-21idleruntime-cro08:40:000
9268995632,16cyclictest27366-21/usr/sbin/munin10:25:140
9268995632,15cyclictest28842-21/usr/sbin/munin08:25:160
9268995631,16cyclictest13332-21/usr/sbin/munin07:25:150
926899559,14cyclictest23720-21/usr/sbin/munin10:10:220
9268995531,16cyclictest17105-21/usr/sbin/munin09:45:160
9268995528,17cyclictest16663-21runrttasks07:37:270
9268995512,29cyclictest27295-21memory12:30:180
9268995511,14cyclictest25823-21/usr/sbin/munin12:25:210
926899548,15cyclictest32675-21df08:40:110
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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