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2026-08-27 - 07:58

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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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 Thu Aug 27, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2497322500,2sleep024974-21mailstats21:00:260
924322340,4sleep09242-21wc20:00:160
3091521400,4chrt30916-21apt-get21:25:010
2718621380,5chrt27185-21/usr/sbin/munin21:10:100
1953621250,3sleep019535-21cat20:40:160
2333921240,2sleep023343-21missed_timers23:00:180
779121230,4chrt7792-21awk00:05:280
3120321200,3chrt31204-21/usr/sbin/munin21:25:160
608921190,3chrt6090-21date00:00:020
306421150,3chrt3065-21wc19:35:270
1570921080,2sleep015710-21ls20:25:180
208532970,3sleep020879-21ls20:45:180
258122937,13sleep025841-21irqstats23:10:150
100722854,9sleep010088-21munin-run22:10:000
217012840,3sleep021694-21latency_hist22:55:020
38082825,8sleep03812-21df21:45:120
2759927819,34sleep027677-21awk19:05:210
132502640,3sleep013252-21cut22:20:270
28492996237,16cyclictest16872-21/usr/sbin/munin20:30:140
28492996211,18cyclictest18260-21memory20:35:180
92452600,2sleep09244-21sed00:10:270
2849299599,15cyclictest10528-21memory20:05:190
2849299598,15cyclictest3749-21latency23:50:180
28492995934,17cyclictest7882-21/usr/sbin/munin22:00:190
28492995911,15cyclictest31053-21munin-run19:20:010
2849299589,15cyclictest27954-21sshd23:18:260
2849299588,17cyclictest6609-21/usr/sbin/munin00:00:280
2849299587,19cyclictest31187-21/usr/sbin/munin19:20:140
28492995835,14cyclictest15582-21/usr/sbin/munin00:35:240
28492995834,15cyclictest4458-21/usr/sbin/munin19:40:340
28492995834,15cyclictest22543-21/usr/sbin/munin20:50:290
28492995811,15cyclictest23234-21/usr/sbin/munin20:55:220
28492995810,16cyclictest32754-21find21:30:300
2849299579,17cyclictest17828-21munin-plugin-st22:40:010
2849299578,19cyclictest5893-21sshd19:46:260
2849299578,18cyclictest12624-21/usr/sbin/munin00:25:110
2849299578,17cyclictest28306-21/usr/sbin/munin23:20:250
2849299578,17cyclictest25834-21/usr/sbin/munin21:05:260
2849299577,14cyclictest13951-21grep00:30:080
28492995734,15cyclictest10468-21/usr/sbin/munin22:10:200
28492995733,15cyclictest3066-21/usr/sbin/munin21:40:280
28492995733,15cyclictest24418-21munin-node23:05:110
28492995732,17cyclictest14561-21/usr/sbin/munin22:25:260
28492995711,15cyclictest8909-21munin-run20:00:010
2849299569,16cyclictest14511-21ntp_states20:20:230
2849299569,15cyclictest15563-21memory22:30:170
2849299568,19cyclictest13161-21ntpq20:15:190
2849299568,18cyclictest32475-21/usr/sbin/munin19:25:290
2849299568,13cyclictest2290-21/usr/sbin/munin23:45:200
2849299567,16cyclictest10019-21/usr/sbin/munin00:15:140
28492995633,15cyclictest28561-21/usr/sbin/munin21:15:170
28492995630,16cyclictest12083-21/usr/sbin/munin22:15:300
28492995630,16cyclictest11665-21/usr/sbin/munin20:10:110
28492995626,22cyclictest11619-21/usr/sbin/munin00:20:220
28492995610,16cyclictest1148-21irqstats23:40:160
2849299559,17cyclictest17965-21/usr/sbin/munin22:40:180
2849299558,18cyclictest30088-21sshd23:25:270
2849299557,16cyclictest32344-21memory23:35:170
2849299557,15cyclictest1642-21ps19:30:260
28492995532,15cyclictest30984-21/usr/sbin/munin23:30:160
28492995531,16cyclictest6320-21runrttasks21:55:080
28492995531,16cyclictest22879-21runrttasks22:59:160
28492995531,15cyclictest28582-21runrttasks19:10:080
28492995510,13cyclictest5227-21cut21:50:170
2849299548,13cyclictest6735-21ntpq19:50:200
28492995429,16cyclictest1308-21/usr/sbin/munin21:35:150
2849299537,15cyclictest19835-21/usr/sbin/munin22:45:260
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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