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2026-08-22 - 08:38

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 Sat Aug 22, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1246222330,2sleep012460-21ntpq22:45:190
1243421300,4chrt12432-21df_inode20:40:140
3043321230,4chrt30431-21memory23:55:170
2660021220,3chrt26601-21/usr/sbin/munin23:40:170
2629921190,3chrt26297-21sed23:40:020
29344210518,11sleep029398-21netstat21:45:190
18712956,11sleep01900-21modprobe20:00:000
176802955,11sleep017748-21/usr/sbin/munin23:05:260
140352935,13sleep014086-21/usr/sbin/munin20:45:250
61012910,4sleep06181-21cut22:20:270
36822915,12sleep03762-21cut20:05:260
86642870,3sleep08662-21ls20:25:170
73812870,2sleep07378-21cat20:20:170
216582840,3sleep021722-21wc23:20:260
295202830,3sleep029518-21grep23:50:280
242822796,60sleep024284-21ntpq21:25:200
109312790,3sleep010968-21grep20:35:010
2142827820,33sleep021453-21munin-run19:10:020
90942705,53sleep0288-21snmpd22:31:590
308452670,2sleep030846-21expr21:50:250
21479996523,15cyclictest28464-21/usr/sbin/munin21:40:290
21479996425,27cyclictest6895-21/usr/sbin/munin00:30:130
2147999619,18cyclictest23153-21ntp_states19:15:250
21479996135,16cyclictest24725-21/usr/sbin/munin19:20:250
2147999599,17cyclictest8116-21/usr/sbin/munin00:35:260
2147999599,17cyclictest29335-21/usr/sbin/munin19:40:240
2147999599,16cyclictest11027-21if_eth022:40:140
2147999598,18cyclictest26846-21ntp_states21:35:210
2147999598,17cyclictest22519-21/usr/sbin/munin23:25:250
21479995934,17cyclictest21277-21runrttasks21:15:020
21479995919,14cyclictest28521-21runrttasks23:47:270
21479995912,18cyclictest18065-21sort21:00:250
2147999587,18cyclictest5893-21/usr/sbin/munin20:15:260
21479995833,17cyclictest16964-21runrttasks20:56:400
21479995832,16cyclictest18962-21/usr/sbin/munin23:10:240
21479995811,17cyclictest4341-21/usr/sbin/munin00:20:140
2147999579,16cyclictest5632-21/usr/sbin/munin00:25:130
2147999578,16cyclictest25455-21/usr/sbin/munin19:25:130
2147999578,15cyclictest2946-21/usr/sbin/munin00:15:170
2147999577,17cyclictest2034-21/usr/sbin/munin20:00:270
21479995733,15cyclictest1847-21/usr/sbin/munin00:10:180
21479995729,21cyclictest21211-21latency_hist23:20:030
21479995710,18cyclictest31784-21munin-run19:50:000
2147999569,19cyclictest31906-21memory21:55:180
2147999569,18cyclictest19921-21sshd21:09:400
2147999569,15cyclictest31831-21ntpq00:00:210
2147999568,16cyclictest4605-21/usr/sbin/munin20:10:140
2147999568,15cyclictest22765-21df21:20:120
2147999568,14cyclictest1861-21/usr/sbin/munin22:05:270
2147999567,15cyclictest14745-21/usr/sbin/munin22:55:220
2147999566,17cyclictest307-21munin-node19:50:110
21479995633,15cyclictest27381-21runrttasks19:30:430
21479995633,13cyclictest25400-21/usr/sbin/munin21:30:190
21479995632,16cyclictest9591-21runrttasks22:35:100
21479995632,16cyclictest14606-21runrttasks22:54:560
21479995631,16cyclictest22394-21runrttasks21:18:390
21479995631,16cyclictest11717-21runrttasks20:35:550
21479995615,13cyclictest21738-21latency19:10:160
21479995610,16cyclictest28080-21/usr/sbin/munin19:35:100
21479995532,15cyclictest3471-21/usr/sbin/munin22:10:240
21479995532,14cyclictest749-21/usr/sbin/munin22:00:160
21479995530,15cyclictest4835-21/usr/sbin/munin22:15:270
21479995529,17cyclictest7312-21/usr/sbin/munin22:25:190
21479995432,14cyclictest24054-21/usr/sbin/munin23:30:190
21479995427,16cyclictest16109-21/usr/sbin/munin23:00:110
21479995330,14cyclictest378-21munin-node00:05:100
2147999529,15cyclictest15079-21irqstats20:50:160
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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