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2026-09-20 - 08:12

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 Sun Sep 20, 2026 00:43:23)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1731426261,0sleep00-21swapper/018:42:260
304450390,0irq/25-eth10-21swapper/318:43:083
1715623725,0sleep20-21swapper/218:40:362
1712723324,0sleep10-21swapper/118:40:151
339960,0migration/324334-21munin-node20:48:393
339960,0migration/322406-21sh21:04:413
339960,0migration/321217-21sh22:27:383
29715060,0irq/26-eth0-rx-23831-21iostat21:48:403
19160,0ktimersoftd/115669-21diskmemload22:18:421
174709960,0cyclictest20053-21forks23:48:382
174709960,0cyclictest0-21swapper/219:58:462
174699960,0cyclictest23281-21ssh21:07:171
149960,0migration/032189-21cpuspeed_turbos19:18:400
149960,0migration/029360-21sh22:33:160
149960,0migration/011461-21sh22:38:570
8215050,0irq/24-0000:00:15232-21cat21:23:252
8215050,0irq/24-0000:00:13476-21sadc22:23:242
4150,0ktimersoftd/00-21swapper/021:02:240
4150,0ktimersoftd/00-21swapper/021:02:240
339950,0migration/36846-21latency_hist21:38:243
339950,0migration/35874-21taskset19:22:003
339950,0migration/34102-21taskset22:57:163
339950,0migration/331392-21munin-node18:53:383
339950,0migration/331242-21kthreadcore23:53:413
339950,0migration/327428-21timerwakeupswit20:23:463
339950,0migration/325366-21timerandwakeup19:33:483
339950,0migration/323110-21munin-node22:08:393
339950,0migration/321800-21kthreadcore23:48:423
339950,0migration/321356-21hddtemp_smartct19:58:363
339950,0migration/320412-21kthreadcore18:43:423
339950,0migration/318852-21runrttasks23:25:313
339950,0migration/314952-21switchtime20:38:473
339950,0migration/314104-21taskset20:59:003
339950,0migration/314104-21taskset20:59:003
339950,0migration/313844-21irqcore23:03:413
339950,0migration/312683-21taskset19:28:183
339950,0migration/312542-21fschecks_time19:03:393
339950,0migration/312256-21irqrtprio00:03:413
339950,0migration/310354-21munin-node23:18:503
339950,0migration/310327-21taskset23:40:093
29725050,0irq/27-eth0-tx-9438-21processes23:38:462
29725050,0irq/27-eth0-tx-5349-21telnet18:58:380
29725050,0irq/27-eth0-tx-30986-21munin-node18:53:500
29725050,0irq/27-eth0-tx-25315-21munin-node19:13:460
29725050,0irq/27-eth0-tx-23926-21munin-node21:08:432
29725050,0irq/27-eth0-tx-23416-21munin-node21:28:452
29725050,0irq/27-eth0-tx-21576-21munin-node20:23:360
29725050,0irq/27-eth0-tx-20428-21ssh22:25:142
29725050,0irq/27-eth0-tx-17307-21ssh00:04:142
29725050,0irq/27-eth0-tx-15987-21munin-node21:03:502
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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