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2026-06-10 - 13:32

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 792 highest latencies:
System rack4slot6s.osadl.org (updated Wed Jun 10, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
873622500,2sleep08739-21processes23:30:240
1116421190,4chrt11166-21latency_hist19:30:010
1755621170,4chrt17554-21if_eth000:05:200
3209321160,4chrt32092-21sed20:50:170
1274521140,4chrt12741-21cat19:35:200
2061821120,4sleep020687-21awk22:10:260
190712960,4sleep019081-21entropy20:00:140
94122955,10sleep09413-21sshd21:27:290
62702896,11sleep06278-21memory19:10:160
26192880,3sleep02618-21grep21:00:280
140172886,10sleep014042-21memory19:40:180
137232880,3sleep013727-21memory23:50:180
109212850,4sleep010920-21latency_hist23:40:030
188302796,60sleep018846-21irqstats00:10:160
507527720,34sleep05078-21ntpq19:05:210
269782770,3sleep027056-21mailstats22:35:250
211942750,4sleep021285-21modprobe00:20:030
201782740,3sleep020181-21missed_timers00:15:200
266682640,3sleep026667-21latency_hist20:30:010
599199628,15cyclictest28366-21grep22:40:260
5991996210,17cyclictest21585-21/usr/sbin/munin20:10:280
599199609,18cyclictest22642-21readlink22:20:010
599199608,18cyclictest17460-21chrt22:00:010
5991996021,14cyclictest7226-21if_eth023:25:150
264542603,9sleep00-21swapper22:34:420
5991995914,15cyclictest68242chrt23:23:500
599199589,17cyclictest8696-21/usr/sbin/munin19:20:270
599199589,15cyclictest1925-21/usr/sbin/munin23:05:280
5991995833,17cyclictest3520-21/usr/sbin/munin21:05:180
5991995832,16cyclictest29442-21/usr/sbin/munin22:45:190
5991995832,16cyclictest11187-21/usr/sbin/munin21:35:110
5991995815,14cyclictest285-21sshd00:04:320
5991995811,15cyclictest7283-21/usr/sbin/munin21:20:300
5991995810,16cyclictest4655-21sed23:15:180
5991995810,14cyclictest11506-21/usr/sbin/munin19:30:190
599199579,15cyclictest30499-21/usr/sbin/munin22:50:260
599199579,15cyclictest15434-21grep21:50:240
599199578,17cyclictest13725-21/usr/sbin/munin21:45:110
599199578,16cyclictest20300-21/usr/sbin/munin20:05:270
599199577,17cyclictest22777-21/usr/sbin/munin22:20:200
599199576,19cyclictest16417-21/usr/sbin/munin19:50:150
5991995735,14cyclictest10459-21runrttasks21:30:370
5991995732,16cyclictest32354-21/usr/sbin/munin22:55:290
5991995732,15cyclictest5266-21/usr/sbin/munin21:10:290
5991995731,15cyclictest22922-21/usr/sbin/munin20:15:100
5991995721,12cyclictest276-21runrttasks20:58:330
5991995720,12cyclictest18815-21latency_hist22:05:010
599199568,14cyclictest28178-21irqstats20:35:180
599199568,14cyclictest18942-21df22:05:130
5991995634,14cyclictest7376-21/usr/sbin/munin19:15:110
5991995632,15cyclictest17909-21/usr/sbin/munin19:55:180
5991995630,16cyclictest25290-21runrttasks20:24:370
5991995629,16cyclictest14967-21irqstats23:55:180
5991995610,14cyclictest3719-21/usr/sbin/munin23:10:280
599199559,17cyclictest25404-21awk00:35:170
599199559,16cyclictest27916-21munin-run20:35:000
599199558,16cyclictest1197-21/usr/sbin/munin23:00:280
599199557,16cyclictest24059-21/usr/sbin/munin22:25:160
599199557,15cyclictest15134-21/usr/sbin/munin19:45:240
5991995532,15cyclictest11650-21runrttasks23:41:050
5991995531,16cyclictest24116-21/usr/sbin/munin00:30:200
5991995511,15cyclictest30820-21memory20:45:190
5991995510,16cyclictest13683-21latency_hist21:45:010
5991995429,16cyclictest22661-21/usr/sbin/munin00:25:140
5991995411,14cyclictest6262-21ntp_states21:15:260
599199539,15cyclictest12539-21ntp_states23:45:220
599199537,14cyclictest29347-21/usr/sbin/munin20:40:280
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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