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2025-07-12 - 12:59

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 Sat Jul 12, 2025 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
964321510,3sleep09642-21if_err_eth020:15:150
1812021500,3chrt18121-21sshd20:47:180
998521380,3chrt9983-21users22:20:300
2487821380,2sleep024877-21munin-node23:20:110
63421300,4chrt635-21sh21:45:230
1369821280,3chrt13699-21/usr/sbin/munin20:30:210
1503721250,3sleep015036-21proc_pri20:35:260
1082721020,4sleep010891-21run-parts00:30:280
1762421010,4sleep017696-21timerwakeupswit22:50:310
55192960,2sleep05531-21modprobe20:00:000
282312957,12sleep028241-21users21:25:310
17782925,10sleep01817-21memory21:50:220
58232880,3sleep05876-21processes22:05:260
242942857,11sleep024347-21users21:10:290
45772830,4sleep04657-21cut22:00:290
299382820,3sleep029940-21sort23:40:010
33562810,2sleep03355-21ntp_kernel_pll_19:50:220
214442806,62sleep021508-21threads23:05:270
109472730,2sleep010949-21idleruntime20:20:180
2392727218,31sleep023977-21df19:05:120
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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