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2025-11-05 - 14:30

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #1, slot #2

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 20 highest latencies:
System rack1slot2s.osadl.org (updated Wed Nov 05, 2025 12:43:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2735528382,0sleep30-21swapper/306:38:573
2112423526,0sleep20-21swapper/206:35:242
2740723430,0sleep00-21swapper/006:39:300
2711823324,0sleep10-21swapper/106:36:111
28415070,0irq/27-eth0-tx-0-21swapper/211:38:162
339960,0migration/39744-21sh08:51:483
339960,0migration/35628-21sh10:16:113
339960,0migration/34143-21sh10:58:303
339960,0migration/34090-21sh10:11:093
339960,0migration/33608-21sh11:18:593
339960,0migration/332334-21sh08:41:023
339960,0migration/331168-21latency_hist09:50:133
339960,0migration/326818-21unixbench_singl11:10:383
339960,0migration/32609-21sh08:49:303
339960,0migration/314552-21sh10:24:343
339960,0migration/310140-21sh12:01:383
28415060,0irq/27-eth0-tx-26139-21ssh08:40:230
28415060,0irq/27-eth0-tx-0-21swapper/211:51:112
28415060,0irq/27-eth0-tx-0-21swapper/211:49:592
28415060,0irq/27-eth0-tx-0-21swapper/211:31:032
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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