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2026-03-18 - 04:06

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 Mar 18, 2026 00:43:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1730223625,0sleep00-21swapper/018:58:120
304450350,0irq/25-eth10-21swapper/318:58:373
1751923526,0sleep20-21swapper/219:00:462
1119823127,0sleep10-21swapper/118:56:091
35160,0ktimersoftd/30-21swapper/323:06:253
339960,0migration/38303-21munin-node20:51:263
339960,0migration/35111-21sh23:53:363
339960,0migration/329545-21sh23:28:023
339960,0migration/312977-21sh23:58:073
29715060,0irq/26-eth0-rx-431-21iostat_ios22:31:203
29715060,0irq/26-eth0-rx-23381-21port_sshpriv19:01:243
176209960,0cyclictest15778-21diskmemload22:18:210
149960,0migration/030147-21munin-node21:06:260
149960,0migration/023092-21sh21:04:120
339950,0migration/39885-21munin-node20:56:183
339950,0migration/39778-21kthreadcore21:56:233
339950,0migration/39752-21kthreadcore20:06:223
339950,0migration/3859-21if_err_eth1.221:51:213
339950,0migration/328471-21aten_r1power_po20:46:163
339950,0migration/324762-21munin-node21:06:153
339950,0migration/324179-21kthreadcore19:51:223
339950,0migration/323683-21kthreadcore20:16:233
339950,0migration/322818-21sh21:42:153
339950,0migration/322477-21sh21:02:353
339950,0migration/322374-21runrttasks23:04:223
339950,0migration/322061-21latency_hist00:06:043
339950,0migration/317150-21kthreadcore23:21:213
339950,0migration/316529-21kthreadcore19:21:213
339950,0migration/315749-21munin-node23:41:193
339950,0migration/31496-21kthreadcore22:51:213
29725050,0irq/27-eth0-tx-7851-21kthreadcore00:16:202
29725050,0irq/27-eth0-tx-32257-21munin-node22:51:182
29725050,0irq/27-eth0-tx-21933-21munin-node00:26:162
29725050,0irq/27-eth0-tx-19563-21kthreadcore22:41:192
29725050,0irq/27-eth0-tx-16072-21munin-node22:01:252
29725050,0irq/27-eth0-tx-16072-21munin-node22:01:252
29725050,0irq/27-eth0-tx-0-21swapper/223:02:492
29725050,0irq/27-eth0-tx-0-21swapper/221:57:392
29725050,0irq/27-eth0-tx-0-21swapper/200:00:352
29725050,0irq/27-eth0-tx-0-21swapper/020:46:170
29725050,0irq/27-eth0-tx-0-21swapper/020:13:290
29725050,0irq/27-eth0-tx-0-21swapper/019:01:150
29715050,0irq/26-eth0-rx-5869-21ssh23:34:583
29715050,0irq/26-eth0-rx-448-21kthreadcore00:11:213
29715050,0irq/26-eth0-rx-312162sleep319:11:153
29715050,0irq/26-eth0-rx-29636-21ssh22:06:233
29715050,0irq/26-eth0-rx-28596-21tr22:46:213
29715050,0irq/26-eth0-rx-19770-21smartctl00:21:283
29715050,0irq/26-eth0-rx-15127-21irqcore20:11:193
29715050,0irq/26-eth0-rx-13592-21python22:16:263
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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