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2026-04-19 - 13:19

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 Sun Apr 19, 2026 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
395022560,3sleep03948-21vmstat23:35:290
1006722360,3sleep010069-21if_err_eth021:55:150
3225321650,3sleep032249-21latency_hist19:10:020
664021200,4chrt6639-21/usr/sbin/munin21:40:280
399221190,3chrt3993-21/usr/sbin/munin19:25:210
2411921170,3chrt24055-21latency_hist22:50:010
1794921120,3chrt17951-21missed_timers22:25:180
2059221070,4sleep020590-21ntp_states22:35:220
1919521070,4sleep019197-21/usr/sbin/munin20:25:110
1272921070,3sleep012728-21wc22:05:180
3257621060,4chrt32580-21swap21:15:260
1193421010,4sleep011935-21sshd22:00:540
3114721000,4sleep030631-21/usr/sbin/munin23:15:270
8372940,4sleep0854-21fw_packets23:25:150
138562917,10sleep013858-21missed_timers00:15:180
154572875,10sleep015498-21memory20:10:150
298192860,3sleep029824-21/usr/sbin/munin21:05:240
229092850,3sleep022929-21sendmail20:40:000
295392794,61sleep029556-21/usr/sbin/munin23:10:190
33162750,2sleep03315-21sort23:35:020
31492653,5sleep00-21swapper21:27:590
32180996235,18cyclictest28255-21/usr/sbin/munin23:05:180
32180996111,18cyclictest25967-21/usr/sbin/munin20:50:240
3218099608,17cyclictest24235-21/usr/sbin/munin22:50:110
3218099607,18cyclictest26776-21/usr/sbin/munin23:00:160
3218099598,17cyclictest23072-21/usr/sbin/munin20:40:190
3218099598,16cyclictest17620-21sshd20:18:540
32180995926,21cyclictest4733-21/usr/sbin/munin23:40:140
32180995922,12cyclictest1104-21/usr/sbin/munin19:15:200
3218099588,21cyclictest27698-21sshd20:56:540
3218099588,16cyclictest14033-21/usr/sbin/munin20:05:200
32180995835,15cyclictest7922-21/usr/sbin/munin21:45:280
32180995834,16cyclictest4732-21latency_hist21:35:010
32180995833,15cyclictest14120-21/usr/sbin/munin22:10:190
32180995810,17cyclictest30817-21/usr/sbin/munin21:10:170
32180995810,16cyclictest19348-21/usr/sbin/munin00:35:260
3218099579,16cyclictest1237-21/usr/sbin/munin21:20:200
3218099579,15cyclictest18507-21/usr/sbin/munin20:20:280
3218099579,15cyclictest16275-21/usr/sbin/munin00:25:330
3218099579,14cyclictest7220-21/usr/sbin/munin23:50:210
3218099578,18cyclictest19019-21/usr/sbin/munin22:30:220
3218099578,17cyclictest4952-21/usr/sbin/munin21:35:160
3218099578,17cyclictest16458-21/usr/sbin/munin22:20:190
3218099578,16cyclictest15139-21/usr/sbin/munin22:15:280
3218099577,17cyclictest6226-21ntp_states23:45:210
3218099577,15cyclictest2425-21/usr/sbin/munin19:20:310
32180995733,15cyclictest32042-21/usr/sbin/munin23:20:160
32180995733,15cyclictest11186-21/usr/sbin/munin00:05:140
32180995731,15cyclictest12713-21/usr/sbin/munin00:10:240
32180995710,14cyclictest9673-21munin-run00:00:010
3218099569,15cyclictest6270-21/usr/sbin/munin19:35:250
3218099568,16cyclictest21612-21/usr/sbin/munin22:40:110
3218099567,17cyclictest14988-21/usr/sbin/munin00:20:280
3218099567,15cyclictest8687-21/usr/sbin/munin21:50:190
32180995633,15cyclictest25855-21/usr/sbin/munin22:55:250
32180995633,15cyclictest10272-21runrttasks19:50:150
32180995633,14cyclictest8062-21/usr/sbin/munin19:40:270
32180995632,16cyclictest17684-21/usr/sbin/munin00:30:160
3218099558,15cyclictest9861-21awk00:00:120
3218099558,14cyclictest12745-21/usr/sbin/munin20:00:300
32180995530,14cyclictest32678-21/usr/sbin/munin19:10:250
32180995511,17cyclictest9149-21ntp_states19:45:210
32180995511,16cyclictest11825-21/usr/sbin/munin19:55:240
32180995511,14cyclictest24486-21/usr/sbin/munin20:45:150
3218099549,15cyclictest5039-21df19:30:120
32180995430,15cyclictest20542-21df_inode20:30:120
32180995329,15cyclictest28295-21/usr/sbin/munin21:00:110
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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