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2026-05-23 - 09:22

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, slot #8

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 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 100 highest latencies:
System rackcslot8s.osadl.org (updated Sat May 23, 2026 00:46:08)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
715521240,0sleep10-21swapper/100:15:161
613426443,6sleep20-21swapper/219:07:022
267132630,0sleep40-21swapper/421:00:204
111391590,5ptp4l0-21swapper/419:06:074
111391590,5ptp4l0-21swapper/019:08:120
1881915836,7phc2sys0-21swapper/119:05:421
323442560,0sleep10-21swapper/121:54:241
613925242,6sleep70-21swapper/719:07:077
609424938,6sleep60-21swapper/619:06:336
604724735,7sleep50-21swapper/519:06:005
601424736,7sleep30-21swapper/319:05:343
111391360,0ptp4l0-21swapper/400:22:074
111391350,0ptp4l0-21swapper/421:26:114
111391340,0ptp4l0-21swapper/421:51:104
111391330,0ptp4l0-21swapper/421:41:214
111391330,0ptp4l0-21swapper/400:10:204
111391320,0ptp4l0-21swapper/423:16:334
111391320,0ptp4l0-21swapper/400:30:184
111391310,0ptp4l0-21swapper/422:24:514
111391310,0ptp4l0-21swapper/422:07:154
111391310,0ptp4l0-21swapper/400:25:104
111391310,0ptp4l0-21swapper/122:25:111
111391310,0ptp4l0-21swapper/022:47:310
111391310,0ptp4l0-21swapper/022:31:370
111391300,0ptp4l0-21swapper/423:21:434
111391300,0ptp4l0-21swapper/422:38:324
111391300,0ptp4l0-21swapper/421:49:214
111391300,0ptp4l0-21swapper/400:36:394
111391300,0ptp4l0-21swapper/022:02:140
111391300,0ptp4l0-21swapper/021:21:030
111391300,0ptp4l0-21swapper/021:21:030
111391290,0ptp4l29742-21diskmemload22:19:562
111391290,0ptp4l0-21swapper/622:19:516
111391290,0ptp4l0-21swapper/422:02:324
111391290,0ptp4l0-21swapper/120:59:011
111391280,0ptp4l0-21swapper/423:01:574
111391280,0ptp4l0-21swapper/422:29:434
111391280,0ptp4l0-21swapper/223:37:312
111391280,0ptp4l0-21swapper/021:46:020
111391270,0ptp4l0-21swapper/423:35:074
111391270,0ptp4l0-21swapper/421:37:334
111391270,0ptp4l0-21swapper/421:18:144
111391270,0ptp4l0-21swapper/421:18:144
111391270,0ptp4l0-21swapper/419:50:014
111391270,0ptp4l0-21swapper/121:31:041
111391270,0ptp4l0-21swapper/100:27:581
111391270,0ptp4l0-21swapper/023:44:290
111391270,0ptp4l0-21swapper/023:03:030
111391270,0ptp4l0-21swapper/022:58:360
111391270,0ptp4l0-21swapper/022:28:560
111391270,0ptp4l0-21swapper/021:51:140
111391270,0ptp4l0-21swapper/000:26:070
111391270,0ptp4l0-21swapper/000:02:510
111391270,0ptp4l0-21swapper/000:02:500
111391260,5ptp4l2794-21kworker/0:200:11:310
111391260,0ptp4l0-21swapper/421:59:484
111391260,0ptp4l0-21swapper/421:34:284
111391260,0ptp4l0-21swapper/421:24:474
111391260,0ptp4l0-21swapper/421:24:474
111391260,0ptp4l0-21swapper/420:54:104
111391260,0ptp4l0-21swapper/420:35:174
111391260,0ptp4l0-21swapper/200:04:572
111391260,0ptp4l0-21swapper/200:04:562
111391260,0ptp4l0-21swapper/123:04:591
111391260,0ptp4l0-21swapper/022:12:020
111391260,0ptp4l0-21swapper/022:09:210
111391260,0ptp4l0-21swapper/021:25:170
111391260,0ptp4l0-21swapper/000:05:120
111391250,7ptp4l0-21swapper/620:19:156
111391250,1ptp4l497-21fw_forwarded_lo20:05:130
111391250,1ptp4l25057-21fw_forwarded_lo23:55:110
111391250,1ptp4l12038-21fw_conntrack22:10:124
111391250,1ptp4l10672-21users22:50:194
111391250,0ptp4l29742-21diskmemload21:17:401
111391250,0ptp4l29742-21diskmemload21:17:401
111391250,0ptp4l0-21swapper/723:20:277
111391250,0ptp4l0-21swapper/621:19:546
111391250,0ptp4l0-21swapper/621:19:546
111391250,0ptp4l0-21swapper/521:35:125
111391250,0ptp4l0-21swapper/521:10:165
111391250,0ptp4l0-21swapper/519:20:125
111391250,0ptp4l0-21swapper/423:46:474
111391250,0ptp4l0-21swapper/423:06:304
111391250,0ptp4l0-21swapper/422:45:184
111391250,0ptp4l0-21swapper/422:42:424
111391250,0ptp4l0-21swapper/421:05:124
111391250,0ptp4l0-21swapper/420:14:294
111391250,0ptp4l0-21swapper/419:56:274
111391250,0ptp4l0-21swapper/419:35:104
111391250,0ptp4l0-21swapper/400:18:324
111391250,0ptp4l0-21swapper/119:54:591
111391250,0ptp4l0-21swapper/119:19:281
111391250,0ptp4l0-21swapper/022:50:100
111391250,0ptp4l0-21swapper/021:05:190
111391240,2ptp4l3014-21cat20:10:130
111391240,1ptp4l6094-21latency_hist23:30:000
111391240,1ptp4l30676-21if_virbr021:10:131
111391240,1ptp4l29873-21munin-run22:35:006
111391240,1ptp4l20654-21ssh23:05:131
111391240,1ptp4l19185-21fw_conntrack19:35:100
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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