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2026-06-23 - 00:24

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 Mon Jun 22, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2847222580,3sleep028473-21latency_hist10:30:020
2132522570,2sleep021323-21ps07:55:270
2745921410,3chrt27457-21df08:20:090
1729621380,4chrt17294-21users11:50:280
60321370,2sleep0605-21switchtime08:40:270
311421280,4chrt3113-21/usr/sbin/munin08:50:260
2641621210,4chrt26420-21swap10:20:260
1869721200,3chrt18695-21timerandwakeup09:50:270
400621170,3chrt4007-21missed_timers11:00:180
2831521140,3sleep028365-21df12:35:090
2522321110,4sleep024810-21/usr/sbin/munin08:10:280
1031521100,4sleep010321-21df_inode11:25:120
1074821000,3sleep010746-21ntp_states09:20:230
91642930,3sleep09230-21tr11:20:170
79332900,4sleep07979-21interrupts09:10:170
68172900,2sleep06818-21mailstats11:10:250
119832880,4sleep012011-21/usr/sbin/munin09:25:200
10712870,4sleep01082-21sh10:50:000
9215998460,15cyclictest23843-21runrttasks12:16:100
208082800,3sleep020849-21latency_hist07:55:020
9215997649,14cyclictest24758-21ntp_states12:20:220
806527517,33sleep08072-21df_inode07:05:110
9215997346,18cyclictest6377-21sshd09:04:390
9215997248,14cyclictest14555-21/usr/sbin/munin07:30:140
9215997238,20cyclictest13017-21/usr/sbin/munin09:30:180
9215997042,16cyclictest21063-21/usr/sbin/munin10:00:220
9215996942,18cyclictest1704-21/usr/sbin/munin10:50:270
9215996941,19cyclictest15776-21/usr/sbin/munin11:45:250
9215996933,13cyclictest4017-21df_inode08:55:140
9215996845,14cyclictest13635-21runrttasks11:37:080
9215996743,14cyclictest32193-21chrt08:38:140
9215996743,14cyclictest18928-21/usr/sbin/munin07:45:280
9215996738,17cyclictest27989-21chrt12:33:220
9215996643,13cyclictest29518-21seq10:33:500
9215996642,14cyclictest13106-21cat07:25:020
9215996641,15cyclictest9198-21df_inode09:15:130
9215996641,14cyclictest25818-21df_inode12:25:140
9215996641,14cyclictest16027-21awk09:40:260
9215996640,16cyclictest24471-21chrt10:14:500
9215996541,14cyclictest7847-21/usr/sbin/munin11:15:180
9215996441,14cyclictest11695-21/usr/sbin/munin11:30:180
9215996441,13cyclictest16984-21sort09:45:140
9215996439,14cyclictest5926-21chrt11:07:220
9215996436,16cyclictest20325-21chrt09:57:380
9215996436,16cyclictest17837-21chrt07:41:460
9215996435,16cyclictest26436-21wc08:15:240
9215996340,14cyclictest22288-21df08:00:130
9215996339,14cyclictest31209-21sort08:35:010
9215996337,15cyclictest10559-21latency_hist07:15:020
9215996337,14cyclictest22347-21/usr/sbin/munin12:10:260
9215996334,19cyclictest15109-21runrttasks09:37:090
9215996238,14cyclictest28753-21df_inode08:25:140
9215996237,14cyclictest13598-21ps07:25:250
9215996235,16cyclictest24709-21/usr/sbin/munin10:15:130
9215996235,16cyclictest22349-21/usr/sbin/munin10:05:200
9215996235,16cyclictest21193-21/usr/sbin/munin12:05:300
921599619,19cyclictest19299-21/usr/sbin/munin12:00:280
9215996137,14cyclictest276-21runrttasks11:57:530
9215996136,15cyclictest3151-21chrt10:55:540
9215996128,23cyclictest14422-21ntp_states11:40:200
9215996123,26cyclictest23529-21/usr/sbin/munin08:05:230
9215996040,12cyclictest11708-21runrttasks07:19:380
9215996036,14cyclictest16971-21ls07:40:010
9215996035,15cyclictest29920-21/usr/sbin/munin10:35:160
9215996035,13cyclictest1444-21df08:45:130
9215995931,16cyclictest31292-21chrt10:40:170
9215995734,14cyclictest6619-21df_inode09:05:130
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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