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2025-12-02 - 07:22

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 Tue Dec 02, 2025 00:44:02)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1392722650,3sleep013930-21latency_hist20:20:010
282921350,4chrt2828-21/usr/sbin/munin19:35:280
2596821350,3chrt25966-21grep23:10:270
385221340,3chrt3851-21/usr/sbin/munin19:40:190
978221290,3sleep09785-21latency_hist00:15:010
1139021230,3sleep011391-21cat22:15:160
874021220,2sleep08741-21cut20:00:010
3078921200,5sleep030805-21cron19:20:000
1155221160,4sleep011588-21memory20:10:200
2356021140,3sleep023563-21sort20:55:310
1763221070,4sleep017663-21cat22:40:020
622421000,4sleep0324-21munin-node19:50:120
12562990,4sleep01067-21/usr/sbin/munin19:30:210
143862980,4sleep014458-21uptime22:25:300
26062950,3sleep02681-21grep21:40:290
117382940,4sleep011747-21users00:20:290
2765929318,56sleep00-21swapper19:05:320
12232886,8sleep01221-21ntp_states21:35:240
192242875,9sleep019227-21df20:40:130
192332816,60sleep019295-21ntpq22:45:220
99192785,61sleep09963-21if_eth000:15:160
74092786,59sleep07411-21irqstats00:05:170
28250996233,16cyclictest6285-21/usr/sbin/munin21:55:210
2825099619,18cyclictest5974-21/usr/sbin/munin00:00:200
2825099619,18cyclictest22924-21/usr/sbin/munin23:00:220
2825099618,22cyclictest14789-21sshd00:34:190
2825099598,16cyclictest14228-21/usr/sbin/munin20:20:210
2825099597,21cyclictest11048-21sshd20:08:120
28250995934,15cyclictest27129-21/usr/sbin/munin23:15:250
28250995927,21cyclictest18015-21/usr/sbin/munin22:40:210
2825099588,16cyclictest20322-21/usr/sbin/munin22:50:250
2825099588,16cyclictest16573-21/usr/sbin/munin20:30:170
28250995835,15cyclictest32214-21/usr/sbin/munin23:35:210
28250995810,17cyclictest11107-21seq22:14:510
28250995810,15cyclictest16179-21systemctl00:40:000
2825099579,17cyclictest17860-21/usr/sbin/munin20:35:130
2825099579,17cyclictest15338-21/usr/sbin/munin20:25:130
2825099579,16cyclictest3378-21/usr/sbin/munin23:50:240
2825099579,16cyclictest28271-21df_inode21:15:120
2825099579,15cyclictest7403-21/usr/sbin/munin22:00:170
2825099579,15cyclictest21607-21/usr/sbin/munin22:55:180
2825099578,16cyclictest24409-21memory23:05:220
2825099578,16cyclictest1-21systemd20:00:130
28250995733,16cyclictest5086-21/usr/sbin/munin19:45:160
28250995733,15cyclictest1145-21/usr/sbin/munin23:40:260
28250995712,16cyclictest28158-21df23:20:140
28250995711,13cyclictest586-21sshd19:27:120
2825099569,15cyclictest20459-21/usr/sbin/munin20:45:230
2825099568,16cyclictest26926-21/usr/sbin/munin21:10:210
2825099567,18cyclictest25634-21/usr/sbin/munin21:05:120
28250995631,15cyclictest12840-21/usr/sbin/munin00:25:260
28250995629,17cyclictest32084-21runrttasks21:30:020
28250995629,16cyclictest24410-21/usr/sbin/munin21:00:170
28250995610,15cyclictest31032-21/usr/sbin/munin19:20:150
2825099559,17cyclictest30875-21df21:25:140
2825099559,16cyclictest29534-21/usr/sbin/munin21:20:180
2825099559,15cyclictest9285-21users22:05:290
2825099559,14cyclictest21741-21/usr/sbin/munin20:50:130
2825099558,17cyclictest12586-21/usr/sbin/munin22:20:160
2825099558,15cyclictest2285-21memory23:45:180
2825099557,15cyclictest4807-21munin-node21:50:110
28250995532,14cyclictest29794-21/usr/sbin/munin23:25:270
28250995510,18cyclictest29554-21cat19:15:010
28250995510,16cyclictest30975-21ntp_states23:30:260
28250995510,16cyclictest15447-21ntp_states22:30:250
2825099547,17cyclictest3578-21/usr/sbin/munin21:45:140
28250995410,13cyclictest4717-21df23:55:150
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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