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2025-12-31 - 14:36

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #8

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.
Unexpectedly long latencies may be caused by SMIs
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 50 highest latencies:
System rackeslot8s.osadl.org (updated Wed Dec 31, 2025 00:43:50)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
21438919912920,1288cyclictest23721572sleep33
21438919912220,1218cyclictest22684792sleep33
21438919910711,1065cyclictest2442477-21sleep3
24677622210,1sleep00-21swapper/00
24677622210,1sleep00-21swapper/00
2143891991714,1cyclictest0-21swapper/33
2143891991714,1cyclictest0-21swapper/33
23000992161,5sleep22300319-21/usr/sbin/munin2
214389199168,4cyclictest2184580-21turbostat3
2143891991613,1cyclictest0-21swapper/33
2143891991612,2cyclictest2197407-21turbostat3
214389199161,11cyclictest2294437-21turbostat3
214389199156,5cyclictest2539262-21turbostat3
2143891991513,1cyclictest0-21swapper/33
2143891991512,1cyclictest0-21swapper/33
2143891991512,1cyclictest0-21swapper/33
2143891991512,1cyclictest0-21swapper/33
2143891991512,1cyclictest0-21swapper/33
214389199151,11cyclictest2552343-21taskset3
214389199151,11cyclictest2410678-21taskset3
214389199151,11cyclictest2271720-21taskset3
214389199151,10cyclictest2333441-21taskset3
214389199151,10cyclictest2280617-21taskset3
214389199151,10cyclictest2249275-21taskset3
214389199144,7cyclictest23790522sleep33
214389199141,9cyclictest22946762sleep33
214389199141,9cyclictest2159199-21taskset3
2143891991413,0cyclictest0-21swapper/33
2143891991413,0cyclictest0-21swapper/33
2143891991413,0cyclictest0-21swapper/33
2143891991412,1cyclictest0-21swapper/33
2143891991412,0cyclictest0-21swapper/33
2143891991411,1cyclictest0-21swapper/33
214389199141,10cyclictest2526832-21taskset3
214389199141,10cyclictest2497440-21taskset3
214389199141,10cyclictest2391376-21chrt3
214389199141,10cyclictest2342677-21taskset3
214389199141,10cyclictest2261813-21turbostat3
214389199141,10cyclictest2241458-21chrt3
214389199134,7cyclictest2474517-21turbostat3
214389199134,6cyclictest21724122sleep33
214389199132,9cyclictest2448921-21turbostat3
214389199131,9cyclictest2569643-21taskset3
214389199131,9cyclictest2454941-21taskset3
214389199131,9cyclictest2400276-21taskset3
214389199131,9cyclictest2365530-21turbostat3
214389199131,9cyclictest2229864-21taskset3
214389199131,9cyclictest2158188-21taskset3
214389199131,8cyclictest2487643-21taskset3
214389199131,8cyclictest2320125-21turbostat3
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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