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2026-01-04 - 18:47

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 Jan 04, 2026 12:43:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
304450710,0irq/25-eth10-21swapper/307:07:383
2248723625,0sleep10-21swapper/107:04:011
1644323624,0sleep00-21swapper/007:02:560
2264823526,0sleep20-21swapper/207:05:542
228919974,0cyclictest30562-21munin-run07:37:540
4160,0ktimersoftd/023064-21cut07:07:540
4160,0ktimersoftd/00-21swapper/009:54:430
339960,0migration/35100-21needreboot11:13:133
339960,0migration/332433-21sh11:49:533
339960,0migration/331506-21sh11:12:293
339960,0migration/32070-21sh09:54:323
339960,0migration/316521-21sh11:59:133
339960,0migration/311972-21timerwakeupswit09:18:173
339960,0migration/31024-21sh12:09:453
29715060,0irq/26-eth0-rx-986-21grep10:13:133
29715060,0irq/26-eth0-rx-15702-21iostat_ios09:03:113
249960,0watchdog/224749-21cat12:23:112
228929966,0cyclictest21130-21diskmemload10:04:011
228929960,0cyclictest0-21swapper/111:33:161
228919965,0cyclictest30518-21ssh11:10:040
149960,0migration/07929-21taskset11:18:000
149960,0migration/07929-21taskset11:18:000
149960,0migration/06823-21sh11:15:490
149960,0migration/05253-21runrttasks10:54:360
149960,0migration/031219-21sh10:33:110
149960,0migration/018373-21aten2.4-expect12:03:050
149960,0migration/012945-21sh10:40:230
149960,0migration/012378-21sh10:21:260
4150,0ktimersoftd/00-21swapper/008:38:060
35150,0ktimersoftd/30-21swapper/309:35:583
339950,0migration/37187-21taskset11:34:173
339950,0migration/36886-21taskset10:57:573
339950,0migration/36582-21fschecks_time10:38:083
339950,0migration/35144-21switchtime08:03:173
339950,0migration/33863-21munin-node07:38:143
339950,0migration/330237-21munin-node10:33:063
339950,0migration/330221-21fschecks_count09:13:083
339950,0migration/328019-21kthreadcore07:33:123
339950,0migration/32780-21aten_r1power_vo12:13:093
339950,0migration/327790-21taskset09:09:213
339950,0migration/327179-21sshd10:09:233
339950,0migration/326769-21kthreadcore07:58:113
339950,0migration/320670-21taskset10:43:593
339950,0migration/320236-21kthreadcore07:28:103
339950,0migration/319931-21fschecks_time12:23:063
339950,0migration/318839-21diskmemload12:22:223
339950,0migration/317774-21kthreadcore11:03:113
339950,0migration/317091-21taskset07:26:333
339950,0migration/312878-21fschecks_time10:03:073
339950,0migration/312775-21munin-node07:48:083
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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