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2026-04-25 - 17:21

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 Sat Apr 25, 2026 12:43:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2623623925,0sleep00-21swapper/006:57:040
304450350,0irq/25-eth10-21swapper/306:53:283
2613223526,0sleep20-21swapper/206:55:502
2618523430,0sleep10-21swapper/106:56:291
4160,0ktimersoftd/00-21swapper/009:09:130
339960,0migration/38721-21sh11:50:323
339960,0migration/326508-21sh09:00:563
339960,0migration/317939-21sh10:36:263
339960,0migration/316758-21sh10:53:463
339960,0migration/316758-21sh10:53:463
339960,0migration/313190-21kthreadcore09:12:443
29725060,0irq/27-eth0-tx-5981-21munin-node08:47:410
29725060,0irq/27-eth0-tx-22166-21munin-node07:22:430
29715060,0irq/26-eth0-rx-3954-21perl09:27:413
29715060,0irq/26-eth0-rx-30425-21kthreadcore12:02:453
29715060,0irq/26-eth0-rx-16844-21nfs4_client09:32:453
29715060,0irq/26-eth0-rx-11321-21cut10:12:403
263429960,0cyclictest0-21swapper/211:48:042
149960,0migration/08760-21sh10:48:450
149960,0migration/01960-21sh09:45:220
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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