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2026-04-07 - 18:54

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 Tue Apr 07, 2026 12:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2487122820,3sleep024873-21idleruntime-cro08:30:000
1118422650,3sleep011182-21fgrep07:35:240
2225722270,2sleep022258-21wc10:25:090
1493022140,2sleep014931-21run-parts09:55:250
441421380,3sleep04415-21wc11:20:240
128821280,4chrt1281-21munin-run11:10:010
2017321220,3sleep020172-21wc08:10:250
315121160,4chrt3152-21mailstats11:15:280
699521150,4sleep06998-21df_inode07:20:120
33321120,2sleep0334-21sh09:00:100
1845921050,2sleep018460-21ntpq12:15:220
312582990,3sleep031255-21grep11:00:020
151442980,3sleep015142-21grep07:50:260
154862960,4sleep015521-21date12:05:010
212812890,4sleep021280-21wc08:15:170
129822830,2sleep012984-21latency_hist11:55:010
93882820,4sleep09467-21wc07:30:020
224962810,3sleep022531-21if_err_eth008:20:160
303027519,31sleep03075-21/usr/sbin/munin07:05:100
4235996222,13cyclictest5709-21systemctl11:25:250
4235996220,14cyclictest6342-21sshd09:22:390
138412620,2sleep013902-21timerandwakeup07:45:280
423599609,18cyclictest20787-21/usr/sbin/munin12:25:260
423599609,17cyclictest15618-21/usr/sbin/munin12:05:150
4235996033,18cyclictest27451-21munin-plugin-st08:40:010
423599599,17cyclictest7857-21/usr/sbin/munin11:35:290
423599598,19cyclictest12095-21/usr/sbin/munin07:40:210
4235995935,16cyclictest17414-21/usr/sbin/munin12:10:250
4235995932,19cyclictest24446-21runrttasks10:33:000
4235995931,18cyclictest5796-21/usr/sbin/munin07:15:170
4235995928,16cyclictest25184-21/usr/sbin/munin08:30:180
4235995910,16cyclictest9330-21/usr/sbin/munin09:35:120
423599588,17cyclictest11920-21/usr/sbin/munin09:45:240
4235995829,22cyclictest9792-21runrttasks07:30:230
423599577,18cyclictest17827-21ls08:00:290
4235995734,15cyclictest31883-21/usr/sbin/munin11:00:290
4235995734,14cyclictest16204-21/usr/sbin/munin07:55:170
4235995732,17cyclictest28635-21latency_hist10:50:020
4235995732,16cyclictest23320-21latency_hist12:35:010
4235995732,16cyclictest10498-21/usr/sbin/munin11:45:120
4235995725,22cyclictest6722-21/usr/sbin/munin11:30:160
4235995711,17cyclictest20833-21munin-run10:20:010
4235995710,15cyclictest1450-21df11:10:110
423599569,16cyclictest288-21snmpd11:43:580
423599569,16cyclictest15796-21egrep10:00:110
423599569,16cyclictest1573-21/usr/sbin/munin09:05:100
423599568,17cyclictest24872-21df10:35:130
423599568,16cyclictest18546-21/usr/sbin/munin08:05:280
423599568,15cyclictest13310-21ntp_states11:55:240
423599567,17cyclictest8042-21/usr/sbin/munin09:30:240
423599567,17cyclictest20974-21egrep10:20:110
423599567,16cyclictest4152-21/usr/sbin/munin09:15:220
423599567,15cyclictest18367-21/usr/sbin/munin10:10:130
423599567,14cyclictest13201-21/usr/sbin/munin09:50:190
4235995632,16cyclictest17403-21/usr/sbin/munin10:05:240
4235995632,15cyclictest29168-21ntp_states08:45:240
4235995620,14cyclictest4339-21cpu07:10:100
4235995610,15cyclictest28697-21/usr/sbin/munin10:50:190
4235995610,15cyclictest285-21sshd08:54:270
234962560,4sleep023495-21irqstats12:35:160
423599559,20cyclictest10909-21ntpq09:40:200
423599558,16cyclictest31436-21/usr/sbin/munin08:55:240
423599557,17cyclictest6763-21grep09:25:110
4235995530,16cyclictest27183-21runrttasks10:44:130
4235995510,17cyclictest20760-21runrttasks12:25:020
423599548,16cyclictest2870-21/usr/sbin/munin09:10:240
423599538,17cyclictest114-21systemd-journal08:40:030
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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