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2026-05-06 - 21:28

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 May 06, 2026 12:43:23)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
304450350,0irq/25-eth10-21swapper/306:53:543
247923423,0sleep00-21swapper/006:56:010
233522925,0sleep10-21swapper/106:54:221
221622824,0sleep20-21swapper/206:52:582
25899976,0cyclictest6125-21kthreadcore06:56:421
339960,0migration/36004-21sh12:17:193
339960,0migration/35758-21sendmail_mailtr11:56:453
339960,0migration/315386-21sh11:44:383
25909960,0cyclictest0-21swapper/211:16:482
25899965,0cyclictest17140-21irqcore12:06:401
149960,0migration/07653-21sh08:58:060
149960,0migration/06563-21sh12:18:500
149960,0migration/031967-21sh10:33:290
149960,0migration/029727-21diskmemload09:11:410
149960,0migration/017417-21sh09:25:550
149960,0migration/014933-21taskset12:24:490
149960,0migration/014432-21sh12:02:350
149960,0migration/012542-21kthreadcore10:41:410
8215050,0irq/24-0000:00:23574-21latency_hist07:36:252
4150,0ktimersoftd/00-21swapper/009:31:340
4150,0ktimersoftd/00-21swapper/009:31:340
339950,0migration/39947-21taskset07:23:063
339950,0migration/38627-21fschecks_time12:01:373
339950,0migration/37431-21kthreadcore07:46:413
339950,0migration/33775-21munin-node07:41:463
339950,0migration/33555-21kthreadcore10:36:403
339950,0migration/33349-21kthreadcore08:31:413
339950,0migration/330016-21timerwakeupswit12:11:463
339950,0migration/329866-21taskset07:37:193
339950,0migration/32874-21aten2.4-expect06:56:373
339950,0migration/328611-21kthreadcore09:11:413
339950,0migration/326816-21munin-node08:51:363
339950,0migration/324957-21unixbench-2d08:21:473
339950,0migration/324846-21aten_r1power_fr11:11:343
339950,0migration/323314-21munin-node09:46:443
339950,0migration/323278-21taskset11:28:343
339950,0migration/322349-21taskset07:08:373
339950,0migration/321489-21kthreadcore07:31:423
339950,0migration/319758-21taskset08:45:243
339950,0migration/318947-21kthreadcore10:26:433
339950,0migration/316037-21sh09:03:293
339950,0migration/314512-21munin-node10:41:433
339950,0migration/31306-21kthreadcore08:06:423
339950,0migration/31142-21taskset10:16:343
339950,0migration/311289-21kthreadcore09:21:413
29725050,0irq/27-eth0-tx-9736-21fschecks_count09:01:372
29725050,0irq/27-eth0-tx-9117-21diskstats11:01:372
29725050,0irq/27-eth0-tx-7727-21ssh10:17:432
29725050,0irq/27-eth0-tx-400-21ssh10:15:172
29725050,0irq/27-eth0-tx-26455-21cut11:11:392
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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