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2026-04-15 - 23:00

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 100 highest latencies:
System rackbslot8s (updated Wed Apr 15, 2026 12:44:17)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
28538032126105,18sleep60-21swapper/607:08:246
28536202122106,10sleep30-21swapper/307:05:493
28537752119105,9sleep70-21swapper/707:08:027
2853731211990,23sleep10-21swapper/107:07:231
28538732117102,10sleep20-21swapper/207:09:242
2851792211298,9sleep40-21swapper/407:05:024
2853833211197,9sleep00-21swapper/007:08:500
2853793210995,9sleep50-21swapper/507:08:155
285413899107102,1cyclictest31-21ksoftirqd/209:16:162
2854144991030,100cyclictest0-21swapper/407:30:124
28541389910399,1cyclictest141rcu_preempt10:23:352
285413899103102,1cyclictest31-21ksoftirqd/210:49:292
2854133991030,100cyclictest0-21swapper/108:10:141
28541529910299,3cyclictest553-21snmpd07:56:256
28541529910298,4cyclictest553-21snmpd09:55:566
2854152991020,99cyclictest0-21swapper/607:12:386
28541499910299,3cyclictest553-21snmpd12:16:285
285414999102100,2cyclictest553-21snmpd09:25:555
28541409910299,3cyclictest553-21snmpd10:46:563
28541409910299,3cyclictest553-21snmpd09:43:073
28541389910297,4cyclictest0-21swapper/211:36:112
2854138991021,100cyclictest31-21ksoftirqd/212:36:382
28541339910299,3cyclictest553-21snmpd10:55:131
28541579910199,2cyclictest0-21swapper/711:44:577
28541579910199,2cyclictest0-21swapper/709:09:337
2854157991010,100cyclictest0-21swapper/712:27:057
2854157991010,100cyclictest0-21swapper/708:58:277
28541529910199,2cyclictest553-21snmpd08:05:226
28541529910198,3cyclictest553-21snmpd09:28:466
2854152991010,100cyclictest0-21swapper/610:31:556
2854152991010,100cyclictest0-21swapper/607:22:516
28541499910199,2cyclictest553-21snmpd10:15:245
28541499910198,3cyclictest553-21snmpd10:40:015
28541499910198,2cyclictest605-21lldpd08:53:135
2854149991010,99cyclictest0-21swapper/507:56:165
2854149991010,101cyclictest0-21swapper/512:24:235
2854149991010,101cyclictest0-21swapper/507:49:435
2854149991010,100cyclictest0-21swapper/510:20:335
2854149991010,100cyclictest0-21swapper/508:15:295
2854149991010,0cyclictest0-21swapper/509:05:165
28541449910199,2cyclictest553-21snmpd12:39:124
28541449910199,2cyclictest553-21snmpd12:01:434
28541449910198,3cyclictest553-21snmpd08:34:334
285414499101100,1cyclictest553-21snmpd08:41:204
28541409910199,2cyclictest553-21snmpd12:39:563
28541409910199,2cyclictest553-21snmpd08:46:233
28541409910199,2cyclictest553-21snmpd08:24:193
28541409910199,2cyclictest553-21snmpd07:46:283
28541389910199,2cyclictest0-21swapper/211:23:482
28541389910199,1cyclictest553-21snmpd08:31:002
285413899101101,0cyclictest31-21ksoftirqd/211:25:122
285413899101101,0cyclictest31-21ksoftirqd/209:40:162
285413899101100,1cyclictest0-21swapper/210:04:342
2854138991010,101cyclictest0-21swapper/212:17:462
2854138991010,100cyclictest31-21ksoftirqd/211:11:332
2854138991010,100cyclictest31-21ksoftirqd/210:13:582
2854138991010,100cyclictest3045323-21kworker/2:212:00:092
2854138991010,100cyclictest29907942sleep210:17:442
2854138991010,100cyclictest2944783-21fw_packets09:35:122
2854138991010,100cyclictest2916116-21diskmemload11:08:562
2854138991010,100cyclictest2913667-21kworker/2:010:42:502
2854138991010,100cyclictest2913667-21kworker/2:009:50:152
2854138991010,100cyclictest2875555-21kworker/2:108:10:132
2854138991010,100cyclictest2831192-21kworker/2:007:35:112
2854138991010,100cyclictest0-21swapper/212:32:482
2854138991010,100cyclictest0-21swapper/210:36:002
2854138991010,100cyclictest0-21swapper/207:40:402
28541339910199,2cyclictest553-21snmpd12:20:281
2854133991010,99cyclictest0-21swapper/110:47:561
2854133991010,0cyclictest0-21swapper/108:52:161
28541259910199,2cyclictest553-21snmpd10:07:440
2854125991010,100cyclictest2916116-21diskmemload09:39:010
2854157991000,99cyclictest0-21swapper/711:04:057
2854157991000,99cyclictest0-21swapper/710:47:227
2854157991000,99cyclictest0-21swapper/708:47:087
2854157991000,99cyclictest0-21swapper/707:35:007
2854157991000,99cyclictest0-21swapper/707:24:487
2854157991000,1cyclictest0-21swapper/712:10:117
2854157991000,100cyclictest0-21swapper/708:36:207
28541529910099,1cyclictest553-21snmpd08:57:576
28541529910099,1cyclictest553-21snmpd08:03:406
28541529910099,1cyclictest553-21snmpd07:36:486
28541529910099,1cyclictest553-21snmpd07:25:556
28541529910098,2cyclictest553-21snmpd12:34:116
28541529910098,2cyclictest553-21snmpd12:28:086
28541529910098,2cyclictest553-21snmpd10:21:306
28541529910098,2cyclictest553-21snmpd09:38:236
28541529910097,3cyclictest553-21snmpd10:12:146
28541529910096,4cyclictest553-21snmpd12:05:346
285415299100100,0cyclictest553-21snmpd08:34:446
2854152991000,99cyclictest0-21swapper/610:27:276
2854152991000,99cyclictest0-21swapper/607:44:306
2854152991000,100cyclictest0-21swapper/612:35:426
2854152991000,100cyclictest0-21swapper/612:00:316
2854152991000,100cyclictest0-21swapper/611:55:146
2854152991000,100cyclictest0-21swapper/611:53:246
28541499910098,2cyclictest553-21snmpd12:11:325
28541499910098,2cyclictest553-21snmpd09:44:555
28541499910097,3cyclictest553-21snmpd08:28:505
28541499910097,3cyclictest553-21snmpd08:28:505
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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