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2026-04-28 - 03:22

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 Tue Apr 28, 2026 00:43:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1437423925,0sleep00-21swapper/018:55:040
304450350,0irq/25-eth10-21swapper/318:52:463
1437123526,0sleep20-21swapper/218:55:022
1442123424,0sleep10-21swapper/118:55:411
339960,0migration/328347-21sh22:05:433
339960,0migration/32705-21ksmtuned22:47:593
339960,0migration/327010-21sh23:45:093
339960,0migration/324063-21taskset20:16:133
339960,0migration/312701-21sh22:37:203
29715060,0irq/26-eth0-rx-28391-21perl00:07:283
29715060,0irq/26-eth0-rx-24187-21cut23:22:303
29715060,0irq/26-eth0-rx-1730-21grep22:27:303
146289965,0cyclictest26501-21sed19:52:311
146289960,0cyclictest12836-21diskmemload21:05:341
149960,0migration/08065-21kthreadcore21:52:290
149960,0migration/028030-21sh22:04:490
149960,0migration/019992-21sh22:40:480
149960,0migration/019913-21sh21:59:270
4150,0ktimersoftd/00-21swapper/021:16:190
35150,0ktimersoftd/30-21swapper/321:36:113
339950,0migration/38915-21munin-node19:37:333
339950,0migration/34975-21latency_hist21:52:133
339950,0migration/330306-21kthreadcore23:27:283
339950,0migration/330188-21munin-node21:47:283
339950,0migration/328359-21kthreadcore19:52:313
339950,0migration/328003-21sh22:45:463
339950,0migration/326771-21runrttasks00:26:123
339950,0migration/322121-21kthreadcore00:02:313
339950,0migration/321955-21kthreadcore23:02:303
339950,0migration/320008-21munin-node20:37:283
339950,0migration/319864-21diskmemload21:18:273
339950,0migration/317062-21munin-node19:22:293
339950,0migration/316246-21kthreadcore20:32:313
339950,0migration/315173-21kthreadcore20:07:293
339950,0migration/314003-21kthreadcore22:57:293
29725050,0irq/27-eth0-tx-6716-21cut23:52:302
29725050,0irq/27-eth0-tx-5634-21diskstats21:12:242
29725050,0irq/27-eth0-tx-3514-21snmpd19:19:580
29725050,0irq/27-eth0-tx-28499-21ssh22:06:092
29725050,0irq/27-eth0-tx-23921-21ssh21:42:302
29725050,0irq/27-eth0-tx-20635-21perl23:42:242
29725050,0irq/27-eth0-tx-20578-21munin-node23:02:252
29725050,0irq/27-eth0-tx-20283-21ssh21:39:532
29725050,0irq/27-eth0-tx-19937-21ssh22:40:392
29725050,0irq/27-eth0-tx-14307-21irqrtprio20:57:300
29725050,0irq/27-eth0-tx-12282-21munin-node23:17:292
29725050,0irq/27-eth0-tx-1195-21munin-node23:47:342
29725050,0irq/27-eth0-tx-0-21swapper/223:26:142
29725050,0irq/27-eth0-tx-0-21swapper/222:32:172
29725050,0irq/27-eth0-tx-0-21swapper/200:15:012
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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