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2026-09-11 - 13:11

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 Fri Sep 11, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2189422630,3sleep021896-21latency20:25:170
735721460,2sleep07374-21cpu21:35:110
124721460,3sleep01249-21timerandwakeup23:15:250
1432921270,3sleep014331-21switchtime22:00:280
3124321200,3sleep031246-21mailstats21:00:250
1831221200,4chrt18313-21mailstats20:10:260
1002321200,2sleep010022-21forks21:45:140
911021190,2sleep09108-21sendmail_mailtr21:40:270
1110021190,4chrt11098-21df23:55:130
652421110,3sleep06535-21ntp_states19:25:200
359221100,3sleep03624-21if_eth021:20:180
2681721090,2sleep026818-21cat20:45:010
39452900,4sleep03649-21/usr/sbin/munin19:15:230
281082850,2sleep028109-21date20:50:010
151592854,9sleep015168-21df22:05:130
102052855,9sleep010276-21threads23:50:280
106227820,31sleep01112-21df19:05:100
3472703,5sleep00-21swapper23:13:070
64802660,4sleep06482-21fgrep21:30:250
227399659,22cyclictest27801-21sshd22:54:250
205612650,2sleep020562-21mailstats00:30:270
2273996423,15cyclictest12512-21/usr/sbin/munin21:55:110
2273996321,16cyclictest13026-21/usr/sbin/munin19:50:250
2273996316,15cyclictest16769-21/usr/sbin/munin20:05:190
160942610,2sleep016179-21latency_hist00:15:020
2273996019,14cyclictest25482-21munin-run20:40:010
2273996010,17cyclictest21056-21/usr/sbin/munin20:20:280
227399598,19cyclictest28062-21chrt22:55:130
227399598,16cyclictest11590-21/usr/sbin/munin19:45:160
2273995935,15cyclictest29859-21/usr/sbin/munin20:55:250
2273995934,16cyclictest25583-21/usr/sbin/munin22:45:170
2273995924,13cyclictest1443-21timerandwakeup21:10:270
2273995923,14cyclictest3317-21/usr/sbin/munin23:25:240
2273995912,16cyclictest17968-21ntpq22:15:210
2273995910,16cyclictest8476-21/usr/sbin/munin23:45:140
227399588,16cyclictest7194-21/usr/sbin/munin23:40:280
227399587,18cyclictest11232-21/usr/sbin/munin21:50:150
227399587,17cyclictest2031-21/usr/sbin/munin23:20:230
227399587,17cyclictest13822-21cat00:05:170
2273995833,16cyclictest2885-21/usr/sbin/munin19:10:280
2273995832,17cyclictest15728-21/usr/sbin/munin20:00:260
2273995832,16cyclictest8962-21irqstats19:35:160
227399578,17cyclictest6177-21ntp_states23:35:240
227399578,16cyclictest29318-21/usr/sbin/munin23:00:260
227399578,15cyclictest21563-21/usr/sbin/munin22:30:240
227399578,15cyclictest21121-21sshd22:27:240
2273995735,14cyclictest30659-21/usr/sbin/munin23:05:120
2273995734,15cyclictest8126-21runrttasks19:30:270
2273995733,14cyclictest4935-21/usr/sbin/munin23:30:270
2273995732,16cyclictest16964-21/usr/sbin/munin22:10:270
2273995732,15cyclictest28432-21/usr/sbin/munin20:50:200
2273995710,15cyclictest24700-21ls22:40:280
202482573,45sleep00-21swapper20:19:350
227399569,16cyclictest288-21snmpd21:16:580
227399568,15cyclictest32070-21/usr/sbin/munin21:05:160
227399566,15cyclictest12354-21/usr/sbin/munin00:00:280
2273995632,15cyclictest5108-21/usr/sbin/munin21:25:240
2273995631,16cyclictest21911-21/usr/sbin/munin00:35:280
2273995631,16cyclictest16559-21/usr/sbin/munin00:15:240
227399558,17cyclictest14371-21sendmail_mailqu19:55:240
227399558,14cyclictest18810-21/usr/sbin/munin00:25:190
227399557,16cyclictest5099-21/usr/sbin/munin19:20:140
227399557,14cyclictest6350irq/103-63fec0022:35:130
2273995530,16cyclictest18335-21runrttasks00:22:100
2273995429,15cyclictest10208-21/usr/sbin/munin19:40:150
227399538,14cyclictest19126-21if_eth022:20:150
2273995328,16cyclictest23735-21runrttasks20:31:200
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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