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2026-06-22 - 20:52

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 20 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
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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