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2026-03-21 - 12:08

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #2, slot #7

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 here to display the system's profile data or here to proceed to next system.
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 rack2slot7s.osadl.org (updated Sat Mar 21, 2026 00:43:35)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
814896996041,15cyclictest151ktimers/019:35:260
814896995723,22cyclictest12350irq/32-eth021:35:280
814896995625,20cyclictest151ktimers/022:50:280
814897995446,4cyclictest0-21swapper/119:40:001
81489799534,42cyclictest882815-21ssh21:45:231
814896995237,11cyclictest12350irq/32-eth021:50:270
81489799513,42cyclictest908910-21ssh22:15:251
81489799513,42cyclictest908910-21ssh22:15:251
81489799512,45cyclictest934813-21ssh22:45:231
814896995046,3cyclictest1000642-21kworker/u8:16-writeback00:30:280
81489799491,38cyclictest874200-21rm21:35:291
81489699493,40cyclictest882978-21ssh21:45:280
814897994838,5cyclictest0-21swapper/122:35:241
81489799482,40cyclictest865245-21ssh21:25:231
814896994834,12cyclictest0-21swapper/022:25:300
81489899471,40cyclictest960768-21ssh23:15:222
814896994716,23cyclictest12350irq/32-eth022:05:230
814897994626,16cyclictest271ktimers/120:35:221
814896994634,10cyclictest814895-21cyclictest23:30:220
814896994633,9cyclictest151ktimers/019:40:230
814896994633,9cyclictest151ktimers/019:40:230
814896994621,18cyclictest12350irq/32-eth021:25:260
814898994537,5cyclictest998580-21ssh00:00:002
814897994536,4cyclictest0-21swapper/122:50:221
81489799451,40cyclictest913267-21sh22:20:251
814896994533,7cyclictest12350irq/32-eth023:20:250
814898994436,5cyclictest933757-21munin-plugin-st22:45:012
814898994436,5cyclictest899059-21sh22:05:012
814896994439,2cyclictest0-21swapper/023:20:010
81489699443,38cyclictest852008-21ssh21:10:240
814896994431,10cyclictest12350irq/32-eth022:35:210
814896994427,9cyclictest12350irq/32-eth023:10:220
814898994335,5cyclictest826891-21systemd-run19:50:012
814898994335,5cyclictest826891-21systemd-run19:50:012
814898994335,5cyclictest0-21swapper/221:00:012
81489799435,10cyclictest171rcu_preempt23:00:241
814897994334,6cyclictest899083-21true22:05:011
814897994334,6cyclictest1-21systemd22:30:011
814896994323,3cyclictest171rcu_preempt20:45:240
81489899421,35cyclictest856420-21ssh21:15:242
81489799423,30cyclictest887125-21ssh21:50:261
81489799422,35cyclictest856526-21ssh21:15:271
814896994235,4cyclictest1016680-21latency00:20:170
814896994227,12cyclictest896395-21unixbench_multi22:00:340
81489899411,5cyclictest171rcu_preempt23:20:282
81489799415,27cyclictest969407-21ssh23:25:231
814897994133,5cyclictest1015803-21ssh00:20:011
814896994133,2cyclictest0-21swapper/022:15:230
814896994133,2cyclictest0-21swapper/022:15:230
814896994116,4cyclictest57-21kcompactd022:45:560
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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