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2026-04-01 - 23:43

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 Apr 01, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2689422530,2sleep026893-21awk12:15:260
1126821270,4chrt11266-21ntp_states11:15:200
3042421230,4chrt30422-21df_inode12:30:120
2245821120,4sleep022499-21tr12:00:010
2551221070,3chrt25511-21sed08:00:020
2576021020,2sleep025763-21processes10:05:250
279472865,8sleep027997-21df10:15:110
269642850,3sleep026993-21open_inodes10:10:250
19672850,3sleep01970-21cpu10:40:100
6432753,8sleep0288-21snmpd08:29:360
243812736,56sleep024379-21ntp_states10:00:230
1177127318,32sleep011846-21awk07:05:260
155522660,2sleep015553-21/usr/sbin/munin09:25:250
75442654,52sleep07562-21ntp_states08:55:230
137942650,2sleep013795-21ls11:25:190
12535996119,16cyclictest15532-21ntp_states07:20:240
1253599608,18cyclictest19090-21/usr/sbin/munin07:35:310
1253599608,18cyclictest12304-21/usr/sbin/munin11:20:280
12535996010,18cyclictest23148-21memory07:50:180
1253599599,17cyclictest16573-21df07:25:130
1253599599,16cyclictest11359-21memory09:10:180
1253599598,19cyclictest32117-21chrt10:30:190
1253599598,17cyclictest17462-21/usr/sbin/munin11:40:140
1253599597,19cyclictest7128-21/usr/sbin/munin11:00:200
1253599597,15cyclictest13901-21sshd07:15:020
12535995934,16cyclictest31745-21/usr/sbin/munin12:35:150
12535995934,15cyclictest6040-21/usr/sbin/munin10:55:200
12535995911,15cyclictest12781-21irqstats07:10:170
1253599589,17cyclictest22172-21sed07:45:260
1253599589,17cyclictest12451-21/usr/sbin/munin09:15:250
1253599589,15cyclictest2705-21users08:35:290
1253599588,16cyclictest826-21/usr/sbin/munin08:30:180
12535995835,15cyclictest24161-21/usr/sbin/munin12:05:200
12535995834,15cyclictest29632-21/usr/sbin/munin12:25:280
1253599579,16cyclictest17327-21/usr/sbin/munin11:40:010
1253599579,13cyclictest254922sleep012:10:220
12535995735,15cyclictest20581-21/usr/sbin/munin07:40:160
12535995733,15cyclictest27872-21runrttasks08:09:000
12535995733,15cyclictest25822-21/usr/sbin/munin08:00:210
12535995732,16cyclictest21229-21runrttasks09:48:510
12535995732,16cyclictest16924-21/usr/sbin/munin09:30:290
12535995732,15cyclictest8612-21/usr/sbin/munin11:05:200
12535995731,17cyclictest15693-21runrttasks11:32:170
12535995710,14cyclictest10486-21sshd09:05:320
1253599569,17cyclictest18072-21chrt07:30:200
1253599569,15cyclictest30727-21/usr/sbin/munin08:20:210
12535995633,15cyclictest4616-21/usr/sbin/munin10:50:140
12535995633,15cyclictest23659-21runrttasks09:57:440
12535995632,16cyclictest21830-21/usr/sbin/munin09:50:250
12535995632,16cyclictest18551-21runrttasks09:38:090
12535995610,17cyclictest6053-21df_inode08:50:130
12535995610,13cyclictest30042-21sshd10:21:530
1253599558,16cyclictest20033-21/usr/sbin/munin11:50:280
1253599558,15cyclictest9698-21/usr/sbin/munin11:10:150
1253599557,17cyclictest18936-21/usr/sbin/munin09:40:160
1253599557,16cyclictest195072chrt11:46:460
12535995532,16cyclictest5602-21runrttasks08:47:540
12535995532,16cyclictest4176-21runrttasks08:41:400
12535995531,15cyclictest30668-21/usr/sbin/munin10:25:170
12535995530,16cyclictest30340-21runrttasks08:18:090
12535995530,16cyclictest29032-21runrttasks08:13:000
12535995510,14cyclictest8838-21grep09:00:200
1253599549,15cyclictest28186-21seq12:20:250
1253599549,14cyclictest704-21df10:35:130
12535995431,14cyclictest22804-21/usr/sbin/munin12:00:150
12535995430,15cyclictest3359-21/usr/sbin/munin10:45:170
12535995310,16cyclictest13963-21memory09:20:180
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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