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2026-04-08 - 20:11

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 08, 2026 12:43:23)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2759523624,0sleep00-21swapper/006:59:000
2712223525,0sleep30-21swapper/306:54:273
2739523324,0sleep10-21swapper/106:56:411
2745922824,0sleep20-21swapper/206:57:302
35160,0ktimersoftd/30-21swapper/307:19:243
339960,0migration/37225-21sh11:48:143
339960,0migration/36785-21sh11:25:443
339960,0migration/35670-21sh12:04:543
339960,0migration/332555-21sh09:00:443
339960,0migration/332108-21munin-node12:24:163
339960,0migration/332102-21sh10:42:033
339960,0migration/324950-21sh09:36:433
339960,0migration/315966-21sh10:10:403
339960,0migration/315601-21timerandwakeup09:49:253
29725060,0irq/27-eth0-tx-3047-21munin-node07:29:230
29715060,0irq/26-eth0-rx-23517-21vmstat10:14:273
276679960,0cyclictest25723-21diskmemload10:33:010
276679960,0cyclictest25723-21diskmemload09:17:580
27160,0ktimersoftd/20-21swapper/207:19:242
149960,0migration/06476-21sh12:07:170
149960,0migration/031757-21sh09:59:250
149960,0migration/031585-21sh10:19:370
149960,0migration/02084-21aten_r1power_vo09:24:160
8215050,0irq/24-0000:00:12386-21munin-run08:49:042
4150,0ktimersoftd/00-21swapper/009:29:090
339950,0migration/39776-21switchtime07:54:253
339950,0migration/38042-21runrttasks09:44:493
339950,0migration/36746-21kthreadcore09:24:223
339950,0migration/34857-21kthreadcore09:04:193
339950,0migration/34857-21kthreadcore09:04:193
339950,0migration/3398-21kthreadcore07:24:183
339950,0migration/331603-21kthreadcore07:49:193
339950,0migration/330611-21sh08:34:253
339950,0migration/330245-21kthreadcore06:59:203
339950,0migration/326665-21df_inode09:19:153
339950,0migration/323685-21needreboot08:29:213
339950,0migration/321601-21kthreadcore08:04:203
339950,0migration/316783-21taskset09:11:253
339950,0migration/313011-21kthreadcore07:59:203
339950,0migration/312342-21kthreadcore11:49:173
339950,0migration/310455-21munin-node08:19:213
29725050,0irq/27-eth0-tx-9774-21munin-node07:34:230
29725050,0irq/27-eth0-tx-5903-21munin-node08:44:130
29725050,0irq/27-eth0-tx-23518-21python09:54:242
29725050,0irq/27-eth0-tx-22821-21sendmail_mailqu10:34:232
29725050,0irq/27-eth0-tx-0-21swapper/210:46:272
29725050,0irq/27-eth0-tx-0-21swapper/008:59:080
29725050,0irq/27-eth0-tx-0-21swapper/006:59:260
29715050,0irq/26-eth0-rx-760-21runrttasks11:04:153
29715050,0irq/26-eth0-rx-32576-21ssh09:40:333
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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