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2026-05-14 - 09:29

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 Thu May 14, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
664122450,3sleep06640-21wc21:40:240
1790821290,3chrt17907-21/usr/sbin/munin22:25:120
2737921180,4chrt27376-21proc_pri20:55:230
1939221180,3chrt19390-21awk22:30:190
1522621170,3chrt15227-21latency_hist22:15:020
1906221120,2sleep019063-21cat00:35:140
1444821120,4sleep014144-21/usr/sbin/munin20:05:240
1648821100,4chrt16489-21latency_hist22:20:020
35302920,3sleep03598-21sed21:30:020
56452896,10sleep05691-21users19:30:280
305432835,11sleep0288-21snmpd21:07:590
177312820,3sleep017765-21if_err_eth000:30:140
9452764,61sleep0961-21forks23:25:130
3116527618,33sleep031204-21if_eth019:05:130
259762754,60sleep026020-21mailstats22:55:270
126132660,2sleep012614-21if_eth000:10:140
32297996332,22cyclictest16657-21/usr/sbin/munin22:20:140
32297996130,22cyclictest23258-21/usr/sbin/munin20:40:140
32297996110,16cyclictest2419-21sendmail-msp19:20:010
3229799599,17cyclictest17498-21sshd00:29:440
3229799598,15cyclictest22137-21ntpq20:35:190
32297995934,15cyclictest12967-21/usr/sbin/munin20:00:160
32297995919,11cyclictest12164-21seq00:08:230
32297995914,14cyclictest3988-21/usr/sbin/munin21:30:250
32297995913,20cyclictest24479-21memory22:50:170
3229799589,15cyclictest6386-21/usr/sbin/munin19:35:170
3229799588,17cyclictest9922-21/usr/sbin/munin00:00:260
3229799588,15cyclictest2172-21/usr/sbin/munin23:30:160
32297995832,16cyclictest28897-21/usr/sbin/munin21:00:280
32297995811,16cyclictest13439-21sshd22:06:440
32297995810,16cyclictest11824-21ntpq19:55:200
32297995810,15cyclictest4922-21/usr/sbin/munin21:35:170
32297995810,15cyclictest3051-21grep19:20:270
32297995810,15cyclictest10882-21seq21:57:060
3229799579,17cyclictest114-21systemd-journal19:26:430
3229799579,16cyclictest28708-21/usr/sbin/munin23:05:260
3229799578,16cyclictest32395-21/usr/sbin/munin19:10:200
3229799576,16cyclictest4764-21/usr/sbin/munin23:40:190
32297995733,15cyclictest16102-21runrttasks00:23:480
32297995732,16cyclictest8907-21/usr/sbin/munin23:55:220
32297995732,16cyclictest32467-21/usr/sbin/munin21:15:210
32297995732,15cyclictest17758-21runrttasks20:19:060
32297995731,17cyclictest15481-21runrttasks20:10:120
32297995731,16cyclictest9190-21/usr/sbin/munin21:50:240
32297995724,23cyclictest24194-21latency_hist22:50:010
3229799569,16cyclictest25750-21/usr/sbin/munin20:50:300
3229799569,16cyclictest114-21systemd-journal22:00:430
3229799569,15cyclictest8980-21/usr/sbin/munin19:45:290
3229799569,15cyclictest3599-21irqstats23:35:170
3229799568,15cyclictest26886-21/usr/sbin/munin23:00:200
32297995633,15cyclictest6641-21runrttasks23:45:300
32297995632,15cyclictest30542-21runrttasks23:14:270
32297995632,15cyclictest20737-21/usr/sbin/munin22:35:240
32297995632,14cyclictest7914-21/usr/sbin/munin23:50:280
32297995631,16cyclictest32118-21/usr/sbin/munin23:20:130
32297995630,16cyclictest22138-21/usr/sbin/munin22:40:250
3229799559,14cyclictest19371-21df_inode20:25:130
3229799558,15cyclictest30932-21/usr/sbin/munin21:10:160
3229799557,16cyclictest1078-21/usr/sbin/munin21:20:190
3229799556,13cyclictest139082sleep000:15:140
32297995531,15cyclictest31629-21runrttasks23:17:430
32297995531,14cyclictest10259-21/usr/sbin/munin19:50:090
32297995530,15cyclictest8262-21runrttasks21:46:380
3229799549,15cyclictest7994-21open_files19:40:230
32297995431,15cyclictest18316-21runrttasks20:20:210
32297995410,17cyclictest20780-21memory20:30:170
32297995312,29cyclictest24977-21sort20:45:280
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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