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2025-12-08 - 20:34

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #b, 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 50 highest latencies:
System rackbslot8s (updated Mon Dec 08, 2025 12:44:17)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
22593662137117,11sleep00-21swapper/007:06:500
22595382134119,10sleep30-21swapper/307:09:183
22593282133111,16sleep70-21swapper/707:06:177
22595862129114,10sleep20-21swapper/207:09:572
22594612122108,9sleep10-21swapper/107:08:121
22594182122108,9sleep50-21swapper/507:07:355
22593812122108,9sleep40-21swapper/407:07:024
22593632119104,10sleep60-21swapper/607:06:486
225981799103100,3cyclictest3437785-21snmpd10:54:280
22598179910299,3cyclictest3437785-21snmpd11:49:510
22598179910299,3cyclictest3437785-21snmpd09:34:550
22598179910299,3cyclictest3437785-21snmpd09:13:510
22598179910299,3cyclictest2309489-21cat08:45:170
2259845991010,101cyclictest0-21swapper/710:30:247
2259845991010,100cyclictest0-21swapper/712:03:307
2259845991010,100cyclictest0-21swapper/711:53:427
2259845991010,100cyclictest0-21swapper/709:38:077
22598419910199,2cyclictest3437785-21snmpd10:44:286
225983999101100,1cyclictest3437785-21snmpd10:31:155
22598349910199,2cyclictest3437785-21snmpd09:18:034
22598349910198,3cyclictest3437785-21snmpd12:11:094
22598259910199,2cyclictest3437785-21snmpd11:56:062
22598259910199,2cyclictest2463864-21cat11:45:152
22598259910199,1cyclictest3437785-21snmpd11:02:462
225982599101100,1cyclictest3437785-21snmpd07:52:422
22598219910199,2cyclictest3437785-21snmpd09:22:121
2259821991010,100cyclictest0-21swapper/111:40:171
2259821991010,100cyclictest0-21swapper/110:43:451
22598179910198,3cyclictest3437785-21snmpd08:25:280
22598179910198,3cyclictest3437785-21snmpd08:25:280
2259845991000,99cyclictest0-21swapper/711:06:557
2259845991000,1cyclictest0-21swapper/711:55:057
2259845991000,100cyclictest0-21swapper/708:52:057
22598419910099,1cyclictest3437785-21snmpd10:29:096
22598419910099,1cyclictest3437785-21snmpd08:35:506
22598419910099,1cyclictest3437785-21snmpd08:23:316
22598419910098,2cyclictest3437785-21snmpd07:27:536
2259841991000,99cyclictest0-21swapper/611:51:356
2259841991000,99cyclictest0-21swapper/607:52:426
22598399910099,1cyclictest3437785-21snmpd11:45:515
22598399910099,1cyclictest3437785-21snmpd11:32:175
22598399910099,1cyclictest3437785-21snmpd10:23:275
22598399910099,1cyclictest3437785-21snmpd09:27:225
22598399910099,1cyclictest3437785-21snmpd09:19:095
22598399910099,1cyclictest3437785-21snmpd07:59:235
22598399910099,1cyclictest3437785-21snmpd07:20:475
22598399910099,1cyclictest3437785-21snmpd07:13:355
22598399910099,1cyclictest2301909-21cat08:30:175
22598399910099,1cyclictest0-21swapper/511:26:085
22598399910098,2cyclictest2481757-21cat12:05:185
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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