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2025-07-19 - 06:31

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #b, slot #5

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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  Phytec
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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: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rackbslot5s.osadl.org (updated Sat Jul 19, 2025 00:44:50)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1848566995625,4cyclictest0-21swapper/319:15:013
1848566995431,6cyclictest1916247-21awk22:25:003
1848566995431,6cyclictest1916247-21awk22:25:003
1848557995424,6cyclictest0-21swapper/122:25:001
1848557995424,6cyclictest0-21swapper/122:25:001
1848552995244,4cyclictest1948190-21fschecks_time23:55:170
1848562995138,8cyclictest1880201-21idleruntime-cro20:40:002
1848566994921,7cyclictest0-21swapper/322:40:013
1848557994939,5cyclictest1914513-21sh22:20:001
184855299475,6cyclictest131rcu_preempt21:35:150
1848557994638,5cyclictest1864163-21grep19:50:261
1848566994335,5cyclictest299-21systemd-logind20:35:533
1848562994133,5cyclictest1928588-21munin-run23:00:002
1848562994131,5cyclictest0-21swapper/222:10:212
1848557994130,6cyclictest0-21swapper/121:40:001
1848557994128,10cyclictest1953083-21cat00:10:011
1848552994129,7cyclictest1862942-21latency_hist19:50:010
1848566994031,5cyclictest1935895-21latency_hist23:20:013
1848557994031,6cyclictest1928976-21fschecks_count23:00:161
1848552993927,8cyclictest1878064-21grep20:30:260
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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