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2026-07-18 - 01:18

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 Fri Jul 17, 2026 12:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2959422600,3sleep029596-21ntp_kernel_err09:30:200
2065622440,2sleep020653-21cat11:00:280
1788522250,3sleep017884-21wc10:50:260
1406921420,3sleep014070-21sendmail_mailst10:35:250
2655121330,2sleep026552-21date11:25:020
1265021210,3chrt12653-21if_err_eth008:25:150
911221180,2sleep09113-21cat08:10:260
345121170,3chrt3435-21netstat12:00:180
1156121160,3chrt11562-21mailstats10:25:280
86921120,4sleep0612-21/usr/sbin/munin11:50:200
1796221120,4chrt17960-21ntp_kernel_err08:45:200
2853821040,3sleep028562-21open_inodes07:20:250
3184921020,4sleep031852-21df11:45:130
1631921020,2sleep016320-21sh10:45:140
214552950,3sleep021482-21latency_hist09:00:020
121162930,3sleep012117-21sshd08:22:310
270422910,3sleep027041-21tr09:20:200
82452870,3sleep08248-21idleruntime-cro12:20:010
102532870,4sleep010305-21cat10:20:280
25535998555,16cyclictest18874-21df10:55:140
267682830,2sleep026766-21ls11:25:170
25535998360,14cyclictest8822-21/usr/sbin/munin10:15:260
25535998259,16cyclictest14382-21timerandwakeup08:30:300
98622810,3sleep09918-21/usr/sbin/munin12:25:190
25535998152,18cyclictest2406-21seq07:45:180
25535998052,19cyclictest755-21munin-node09:45:120
25535997947,20cyclictest24515-21/usr/sbin/munin09:10:250
25535997852,15cyclictest32458-21/usr/sbin/munin09:40:300
25535997852,13cyclictest26900-21seq07:15:020
25535997847,18cyclictest3507-21/usr/sbin/munin07:50:300
25535997846,17cyclictest12139-21date12:35:020
2454527820,34sleep024603-21/usr/sbin/munin07:05:200
25535997752,15cyclictest29709-21memory07:25:180
25535997751,16cyclictest31761-21cat11:45:020
25535997751,16cyclictest24578-21users11:15:290
25535997742,21cyclictest15559-21users10:40:280
25535997650,15cyclictest1577-21seq07:40:460
25535997646,19cyclictest6115-21/usr/sbin/munin10:05:190
25535997634,17cyclictest10179-21netstat08:15:210
25535997547,16cyclictest5599-21runrttasks07:57:130
25535997546,17cyclictest7833-21/usr/sbin/munin08:05:290
25535997546,16cyclictest24147-21date09:10:020
25535997540,23cyclictest7803-21sshd10:10:310
218832750,2sleep021885-21cut11:05:270
25535997451,14cyclictest19672-21runrttasks08:51:040
25535997449,14cyclictest29159-21cpu11:35:100
25535997445,18cyclictest12527-21/usr/sbin/munin12:35:220
25535997445,16cyclictest1-21systemd12:06:300
25535997437,24cyclictest4491-21ls10:00:010
25535997351,14cyclictest16292-21munin-run08:40:010
25535997349,15cyclictest27933-21df11:30:140
25535997348,16cyclictest16489-21df_inode08:40:130
25535997348,14cyclictest13494-21chrt10:34:450
25535997346,18cyclictest8671-21ntp_states12:20:220
25535997338,22cyclictest32087-21/usr/sbin/munin07:35:290
25535997245,15cyclictest5892-21ls10:05:020
25535997147,15cyclictest29291-21latency_hist09:30:010
25535997147,14cyclictest5846-21df_inode12:10:140
25535997146,14cyclictest2707-21seq11:57:100
25535997046,14cyclictest23190-21seq11:10:300
25535997037,21cyclictest6695-21seq08:00:320
25535996947,13cyclictest31653-21sshd07:32:300
25535996946,15cyclictest26645-21runrttasks07:13:500
25535996936,22cyclictest25457-21/usr/sbin/munin09:15:190
25535996845,13cyclictest22850-21latency_hist09:05:020
25535996740,17cyclictest2124-21/usr/sbin/munin09:50:140
25535996443,13cyclictest31798-21munin-run09:40:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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