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2026-05-20 - 12:00

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 Wed May 20, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2321222360,3sleep023211-21cat19:20:250
3090821200,4chrt30909-21mailstats19:50:260
2808121150,3chrt28082-21/usr/sbin/munin23:50:260
1995721150,4chrt19949-21if_eth023:20:150
2136121130,3chrt21359-21df21:20:120
474821110,4sleep04766-21ntp_states20:15:220
613721000,4sleep06206-21/usr/sbin/munin22:25:270
304472950,4sleep030449-21ntp_states00:00:230
249162930,4sleep024915-21sort23:40:030
134302920,3sleep013474-21if_eth022:55:140
78982890,3sleep07928-21ls00:40:010
24302855,10sleep02503-21/usr/sbin/munin20:05:290
222682845,8sleep022284-21munin-run23:30:010
5162825,8sleep0545-21/usr/sbin/munin00:10:220
250222810,3sleep025057-21latency_hist21:35:000
8932780,2sleep0892-21awk20:00:190
40752760,3sleep04077-21latency_hist00:25:020
110672720,2sleep011068-21if_err_eth020:40:140
1888026919,26sleep018923-21df19:05:130
295932660,3sleep029592-21wc21:50:280
20068996433,21cyclictest7156-21/usr/sbin/munin22:30:180
20068996212,17cyclictest21744-21ntp_states19:15:240
20068996212,15cyclictest32066-21ntp_states19:55:230
20068996137,15cyclictest6317-21/usr/sbin/munin20:20:270
2006899608,18cyclictest29112-21ntpq23:55:170
20068996036,15cyclictest28070-21/usr/sbin/munin19:40:160
20068996011,18cyclictest16001-21df23:05:100
2006899598,19cyclictest22591-21/usr/sbin/munin21:25:250
2006899597,16cyclictest26470-21/usr/sbin/munin21:40:140
20068995934,17cyclictest20432-21/usr/sbin/munin21:15:280
20068995911,18cyclictest10823-21awk20:40:010
20068995911,17cyclictest32195-21/usr/sbin/munin22:00:290
2006899588,18cyclictest16119-21/usr/sbin/munin21:00:140
2006899588,16cyclictest30316-21/usr/sbin/munin21:55:120
2006899587,18cyclictest15398-21users20:55:280
2006899587,15cyclictest25331-21/usr/sbin/munin19:30:300
20068995816,15cyclictest15875-21latency_hist23:05:020
2006899579,17cyclictest4417-21/usr/sbin/munin22:20:140
2006899579,16cyclictest3809-21seq20:10:320
2006899579,15cyclictest25188-21memory23:40:170
2006899578,15cyclictest454-21/usr/sbin/munin22:05:170
2006899577,15cyclictest29337-21/usr/sbin/munin19:45:150
20068995734,15cyclictest24100-21/usr/sbin/munin19:25:110
20068995730,16cyclictest8932-21/usr/sbin/munin20:30:280
2006899569,16cyclictest18522-21/usr/sbin/munin23:15:190
2006899569,16cyclictest1837-21ntp_states00:15:190
2006899568,16cyclictest4160-21grep00:25:110
2006899568,16cyclictest13941-21systemctl20:50:250
20068995635,14cyclictest28744-21runrttasks21:48:420
20068995633,15cyclictest32296-21runrttasks00:07:290
20068995632,15cyclictest17592-21/usr/sbin/munin21:05:170
20068995631,16cyclictest17525-21/usr/sbin/munin23:10:200
20068995631,16cyclictest12543-21/usr/sbin/munin20:45:230
20068995629,15cyclictest10830-21/usr/sbin/munin22:45:100
20068995626,21cyclictest26341-21sendmail21:40:010
20068995610,14cyclictest27758-21sshd19:39:570
20068995610,14cyclictest22406-21/usr/sbin/munin23:30:270
2006899558,16cyclictest9968-21mailstats22:40:270
2006899558,15cyclictest19104-21find21:10:260
2006899557,15cyclictest7083-21/usr/sbin/munin20:25:300
20068995532,14cyclictest26285-21/usr/sbin/munin23:45:120
20068995528,16cyclictest12403-21/usr/sbin/munin22:50:280
20068995519,12cyclictest4195-21sh22:20:000
2006899549,14cyclictest20434-21ntpq19:10:230
20068995428,19cyclictest0-21swapper00:30:120
2006899537,15cyclictest1741-21/usr/sbin/munin22:10:180
2006899537,14cyclictest8191-21/usr/sbin/munin22:35:190
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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