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2026-04-01 - 16:27

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 Wed Apr 01, 2026 12:43:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
304450390,0irq/25-eth10-21swapper/306:57:343
1422623626,0sleep20-21swapper/206:56:482
1415023626,0sleep10-21swapper/106:55:551
1429323524,0sleep00-21swapper/006:57:340
29715070,0irq/26-eth0-rx-4853-21ssh09:14:443
4160,0ktimersoftd/00-21swapper/012:20:010
339960,0migration/325755-21sh11:25:343
339960,0migration/323786-21ksmtuned08:16:213
339960,0migration/320031-21sh09:02:523
339960,0migration/316199-21kthreadcore09:20:003
29725060,0irq/27-eth0-tx-3261-21munin-node07:40:010
29715060,0irq/26-eth0-rx-4428-21ssh09:33:423
29715060,0irq/26-eth0-rx-2232-21ntp_offset09:50:033
27160,0ktimersoftd/20-21swapper/211:18:172
145469966,0cyclictest0-21swapper/110:47:381
145459960,0cyclictest0-21swapper/007:54:580
149960,0migration/02995-21sh09:10:190
149960,0migration/027373-21sh09:05:360
149960,0migration/020642-21latency_hist10:04:430
149960,0migration/013209-21gltestperf10:19:550
149960,0migration/012352-21sh09:38:270
149960,0migration/011837-21sh10:18:480
149960,0migration/011277-21sh09:56:070
339950,0migration/37800-21needreboot12:15:013
339950,0migration/36995-21kthreadcore10:55:013
339950,0migration/33077-21runrttasks10:32:413
339950,0migration/329790-21munin-node08:20:043
339950,0migration/329249-21kthreadcore11:29:583
339950,0migration/325652-21sh12:07:383
339950,0migration/325468-21sendmail_mailqu11:05:033
339950,0migration/322631-21irqrtprio09:24:593
339950,0migration/322537-21cpuspeed_turbos07:29:543
339950,0migration/322081-21if_eth1.209:44:593
339950,0migration/321775-21gltestperf09:04:563
339950,0migration/321596-21idleruntime10:04:563
339950,0migration/320220-21munin-node07:00:033
339950,0migration/311765-21kthreadcore07:45:003
339950,0migration/311314-21df_abs08:09:563
339950,0migration/310857-21munin-node09:35:063
29725050,0irq/27-eth0-tx-9599-21ssh11:36:112
29725050,0irq/27-eth0-tx-22316-21munin-node07:29:550
29725050,0irq/27-eth0-tx-12802-21munin-node10:00:062
29725050,0irq/27-eth0-tx-0-21swapper/210:13:482
29725050,0irq/27-eth0-tx-0-21swapper/008:54:540
29725050,0irq/27-eth0-tx-0-21swapper/008:46:300
29715050,0irq/26-eth0-rx-8240-21cut08:54:593
29715050,0irq/26-eth0-rx-6559-21runrttasks11:18:453
29715050,0irq/26-eth0-rx-31795-21cut12:10:013
29715050,0irq/26-eth0-rx-0-21swapper/312:26:163
29715050,0irq/26-eth0-rx-0-21swapper/311:56:013
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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