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2026-07-03 - 09:13

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 Fri Jul 03, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1914222640,2sleep019144-21sed23:30:260
1386322540,2sleep013866-21processes23:10:240
2890522510,3sleep028906-21latency_hist00:10:010
2440322330,2sleep024399-21find21:45:250
2147522280,3sleep021471-21cat19:30:010
2930521270,4sleep029304-21irqstats22:05:150
163139912320,15cyclictest8100-21runrttasks22:49:210
163139912222,13cyclictest5662-21latency_hist22:40:020
163139912127,15cyclictest9951-21/usr/sbin/munin22:55:250
16313991188,18cyclictest29072-21latency_hist22:05:010
163139911731,14cyclictest18616-21runrttasks19:18:010
16313991168,21cyclictest17901-21proc_pri21:20:260
163139911626,15cyclictest27507-21runrttasks19:51:500
163139911626,14cyclictest23041-21/usr/sbin/munin23:45:300
2853521150,3chrt28533-21threads19:55:260
163139911528,16cyclictest30449-21/usr/sbin/munin00:15:200
163139911527,15cyclictest15460-21/usr/sbin/munin21:10:270
163139911526,15cyclictest22038-21runrttasks21:35:430
16313991148,16cyclictest3883-21chrt00:38:050
163139911427,15cyclictest30103-21runrttasks00:14:510
163139911425,14cyclictest5746-21munin-node22:40:100
16313991137,22cyclictest16433-21ps23:20:260
163139911327,15cyclictest19781-21runrttasks19:21:470
163139911326,15cyclictest15850-21runrttasks23:19:270
163139911326,14cyclictest14830-21idleruntime-cro21:10:010
163139911324,15cyclictest4267-21runrttasks20:28:150
16313991127,12cyclictest20687-21sed21:30:300
163139911230,72cyclictest18976-21/usr/sbin/munin21:25:140
163139911226,15cyclictest1390-21runrttasks00:28:400
163139911225,14cyclictest3152-21/usr/sbin/munin22:30:180
16313991118,21cyclictest30491-21df22:10:090
163139911125,15cyclictest17348-21runrttasks21:19:390
163139911125,13cyclictest24465-21runrttasks19:40:220
163139911115,16cyclictest20925-21runrttasks23:38:420
163139911112,21cyclictest8676-21memory20:45:180
163139911111,21cyclictest22770-21df_inode21:40:130
16313991108,17cyclictest23147-21ntp_states19:35:220
163139911026,13cyclictest4763-21/usr/sbin/munin20:30:180
163139911021,14cyclictest2159-21/usr/sbin/munin00:30:270
16313991099,17cyclictest25329-21df21:50:120
16313991099,16cyclictest26561-21/usr/sbin/munin21:55:130
16313991099,13cyclictest31718-21irqstats00:20:170
163139910924,17cyclictest9312-21runrttasks22:53:470
163139910924,15cyclictest32608-21runrttasks22:17:420
163139910924,14cyclictest1189-21mailstats20:15:240
163139910911,17cyclictest11102-21memory23:00:240
16313991089,20cyclictest32157-21ntpq20:10:190
16313991088,29cyclictest25090-21/usr/sbin/munin23:55:290
163139910825,13cyclictest25547-21idleruntime19:45:140
163139910822,15cyclictest7068-21munin-run20:40:010
163139910810,20cyclictest24094-21ntp_states23:50:210
163139910810,17cyclictest31212-21users20:05:280
16313991077,26cyclictest21526-21ntp_states23:40:200
163139910723,14cyclictest18128-21runrttasks23:26:470
163139910721,13cyclictest13627-21latency_hist21:05:010
163139910718,11cyclictest0-21swapper20:42:430
163139910711,16cyclictest22171-21users19:30:280
163139910710,17cyclictest9822-21df20:50:110
16313991069,18cyclictest16700-21ntp_states19:10:230
16313991069,17cyclictest11054-21/usr/sbin/munin20:55:130
163139910625,16cyclictest2735-21runrttasks20:21:110
163139910623,13cyclictest884-21open_files22:20:240
163139910619,16cyclictest300452chrt20:01:190
163139910617,18cyclictest27580-21latency_hist00:05:010
163139910610,15cyclictest2010-21irqstats22:25:160
163139910411,14cyclictest12477-21ntp_states23:05:210
1631399957,15cyclictest16385-21ls19:10:030
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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