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2026-08-08 - 02:46

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 50 highest latencies:
System rack1slot2s.osadl.org (updated Sat Aug 08, 2026 00:43:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
304450830,0irq/25-eth10-21swapper/318:44:053
2647424435,0sleep10-21swapper/118:45:361
2632323523,0sleep00-21swapper/018:43:460
2654623329,0sleep20-21swapper/218:46:252
339970,0migration/314986-21munin-node20:57:533
267119977,0cyclictest0-21swapper/020:49:190
8215060,0irq/24-0000:00:13514-21perf23:02:302
339960,0migration/34648-21sh23:37:323
339960,0migration/330875-21sh22:11:413
339960,0migration/323195-21munin-node22:47:433
29725060,0irq/27-eth0-tx-21703-21munin-node23:07:432
29725060,0irq/27-eth0-tx-16594-21munin-node19:52:440
29715060,0irq/26-eth0-rx-23280-21diskstats22:27:423
29715060,0irq/26-eth0-rx-23280-21diskstats22:27:423
29715060,0irq/26-eth0-rx-11823-21grep21:37:473
267139965,0cyclictest8666-21idleruntime-cro19:22:302
267119965,0cyclictest0-21swapper/021:15:340
149960,0migration/03558-21sh23:13:150
149960,0migration/01983-21latency_hist19:17:300
149960,0migration/012854-21run-parts22:38:290
35150,0ktimersoftd/30-21swapper/323:54:203
339950,0migration/37808-21kthreadcore20:07:473
339950,0migration/35229-21kthreadcore20:52:473
339950,0migration/35159-21latency_hist20:32:303
339950,0migration/34499-21latency_hist23:37:293
339950,0migration/332407-21df_abs21:52:433
339950,0migration/329398-21fschecks_count19:37:423
339950,0migration/326639-21kthreadcore20:22:473
339950,0migration/326034-21kthreadcore19:32:473
339950,0migration/322252-21kthreadcore00:07:483
339950,0migration/321025-21munin-node19:27:503
339950,0migration/320917-21kthreadcore19:52:493
339950,0migration/320721-21kthreadcore22:02:463
339950,0migration/320395-21kthreadcore21:42:473
339950,0migration/319766-21irqrtprio20:42:463
339950,0migration/318305-21taskset00:03:073
339950,0migration/316444-21kthreadcore22:22:463
339950,0migration/315207-21gltestperf22:42:423
339950,0migration/314853-21sh22:01:073
339950,0migration/312505-21unixbench-2d22:37:523
29725050,0irq/27-eth0-tx-687-21munin-node21:12:502
29725050,0irq/27-eth0-tx-5241-21munin-node23:17:522
29725050,0irq/27-eth0-tx-30903-21munin-node20:27:540
29725050,0irq/27-eth0-tx-23324-21interrupts22:47:442
29725050,0irq/27-eth0-tx-2018-21kthreadcore23:12:472
29725050,0irq/27-eth0-tx-19370-21kthreadcore21:02:472
29725050,0irq/27-eth0-tx-18594-21munin-node20:42:420
29725050,0irq/27-eth0-tx-13774-21munin-node23:02:502
29725050,0irq/27-eth0-tx-12681-21munin-node23:42:482
29725050,0irq/27-eth0-tx-1029-21wc00:12:492
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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