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2026-01-07 - 00:53

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 Jan 06, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
984022640,2sleep09839-21sort08:20:180
2798322580,2sleep027984-21readlink11:35:250
2922721790,3sleep029225-21ps11:40:260
3199621250,2sleep031998-21wc11:50:260
871621180,3sleep08718-21uname08:15:240
1391921180,4chrt13918-21/usr/sbin/munin08:35:240
437021170,3chrt4371-21modprobe08:00:000
2792821170,4chrt27926-21ls09:30:160
162121160,3chrt1617-21munin-run09:55:010
2157021140,3chrt21569-21/usr/sbin/munin09:05:210
3168521120,4chrt31683-21df09:45:110
1668321060,2sleep016682-21sort08:45:290
1088521060,4sleep010887-21ntp_states12:35:220
2111421020,2sleep021113-21sshd09:04:380
123752940,3sleep012423-21processes10:35:260
248842920,3sleep024925-21latency_hist11:25:020
5522907,10sleep0556-21ntp_states11:55:250
59272890,4sleep06004-21timerwakeupswit12:15:270
306452890,3sleep030675-21/usr/sbin/munin09:40:250
237982860,2sleep023795-21cat09:15:010
279302850,3sleep027969-21cpu07:25:130
28652835,8sleep02915-21df12:05:120
110802826,61sleep011078-21ntp_states10:30:230
150112790,3sleep015082-21mailstats10:45:260
173732770,4sleep017404-21cat10:55:200
20552755,58sleep02118-21ls12:00:270
2302527218,31sleep023023-21ntp_states07:05:200
307032700,2sleep030706-21wc07:35:190
23947996541,15cyclictest26377-21latency_hist09:25:010
2394799619,18cyclictest26475-21/usr/sbin/munin09:25:260
23947996110,17cyclictest19648-21sshd11:04:380
2394799609,17cyclictest8430-21/usr/sbin/munin12:25:260
23947996037,14cyclictest9647-21/usr/sbin/munin12:30:240
23947995933,16cyclictest19507-21runrttasks08:57:160
23947995910,18cyclictest22680-21ntpq11:15:200
2394799588,16cyclictest15940-21/usr/sbin/munin10:50:250
2394799587,17cyclictest14844-21/usr/sbin/munin08:40:160
23947995834,15cyclictest31992-21/usr/sbin/munin07:40:150
23947995834,15cyclictest2042-21/usr/sbin/munin07:50:160
23947995833,15cyclictest13855-21/usr/sbin/munin10:40:250
23947995831,17cyclictest24107-21/usr/sbin/munin07:10:130
23947995810,14cyclictest4647-21irqstats08:00:160
2394799579,15cyclictest9564-21sh10:25:140
2394799578,16cyclictest5794-21/usr/sbin/munin08:05:230
2394799578,16cyclictest5619-21/usr/sbin/munin10:10:200
2394799578,16cyclictest17407-21/usr/sbin/munin08:50:150
2394799578,15cyclictest8218-21/usr/sbin/munin10:20:290
2394799578,15cyclictest19822-21/usr/sbin/munin11:05:280
2394799578,14cyclictest29209-21/usr/sbin/munin07:30:110
23947995734,14cyclictest26528-21/usr/sbin/munin11:30:190
23947995733,15cyclictest3108-21/usr/sbin/munin10:00:140
23947995732,16cyclictest7140-21/usr/sbin/munin08:10:140
23947995732,15cyclictest807-21/usr/sbin/munin07:45:160
23947995731,16cyclictest12326-21/usr/sbin/munin08:30:140
23947995725,22cyclictest29204-21/usr/sbin/munin09:35:170
23947995710,18cyclictest8082-21munin-run10:20:010
23947995710,15cyclictest23970-21/usr/sbin/munin09:15:150
2394799567,15cyclictest26649-21/usr/sbin/munin07:20:310
23947995633,15cyclictest25516-21/usr/sbin/munin07:15:180
23947995631,16cyclictest7162-21/usr/sbin/munin12:20:250
23947995631,16cyclictest25329-21/usr/sbin/munin11:25:250
23947995631,16cyclictest11241-21/usr/sbin/munin08:25:200
23947995631,15cyclictest21238-21/usr/sbin/munin11:10:150
23947995614,13cyclictest1735-21/usr/sbin/munin09:55:180
2394799559,17cyclictest30152-21/usr/sbin/munin11:45:190
2394799558,19cyclictest4442-21ntpq12:10:220
23947995428,15cyclictest5573-21latency_hist10:10:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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