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2026-08-02 - 14:45

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, slot #7

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 rackcslot7s.osadl.org (updated Sun Aug 02, 2026 00:44:48)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
174345321360,9sleep00-21swapper/019:10:000
185121121170,4sleep13056-21PK-Backend00:15:001
174877921020,3sleep00-21swapper/019:20:230
174310028564,14sleep20-21swapper/219:06:062
174312127538,31sleep30-21swapper/319:06:233
174324026545,14sleep10-21swapper/119:07:531
18153472580,3sleep10-21swapper/122:30:191
17991272510,3sleep30-21swapper/321:45:143
139099500,3rtkit-daemon0-21swapper/220:29:443
139099490,3rtkit-daemon0-21swapper/222:24:203
139099370,3rtkit-daemon0-21swapper/222:31:362
17926612290,4sleep13056-21PK-Backend21:25:191
18069312270,2sleep20-21swapper/222:05:212
1743562992716,3cyclictest26-21ksoftirqd/100:08:061
174356299260,7cyclictest3056-21PK-Backend23:45:001
174356299260,7cyclictest3056-21PK-Backend23:45:001
1743562992522,2cyclictest251rcuc/123:57:061
174356299250,6cyclictest3056-21PK-Backend21:05:011
1743562992421,2cyclictest251rcuc/122:49:321
1743559992416,6cyclictest1788082-21grep21:15:000
174355999240,22cyclictest1749953-21wc19:25:160
139099240,4rtkit-daemon1389-21rtkit-daemon22:54:520
174356499236,3cyclictest141rcu_preempt23:20:162
174356299237,7cyclictest1747674-21seq19:20:071
174356299235,8cyclictest26-21ksoftirqd/122:59:461
1743562992320,2cyclictest3056-21PK-Backend23:09:281
1743562992319,3cyclictest251rcuc/120:10:011
1743559992321,1cyclictest0-21swapper/023:33:580
1743559992320,2cyclictest0-21swapper/023:27:350
139099230,4rtkit-daemon1389-21rtkit-daemon00:38:551
174356899220,3cyclictest1794872-21taskset21:32:493
1743564992220,1cyclictest0-21swapper/222:35:572
1743564992220,1cyclictest0-21swapper/222:35:572
1743564992217,3cyclictest34-21ksoftirqd/223:15:142
1743564992215,5cyclictest1798276-21sshd21:42:032
1743564992214,6cyclictest1808114-21fw_packets22:10:142
174356499220,21cyclictest0-21swapper/222:57:342
174356499220,21cyclictest0-21swapper/221:53:062
174356499220,21cyclictest0-21swapper/200:33:392
174356499220,20cyclictest1827365-21load23:05:172
174356299225,10cyclictest26-21ksoftirqd/120:50:161
1743562992220,1cyclictest0-21swapper/123:53:291
1743562992220,1cyclictest0-21swapper/120:38:281
1743562992219,2cyclictest3056-21PK-Backend19:46:091
1743562992219,2cyclictest3056-21PK-Backend19:46:091
1743562992219,2cyclictest3056-21PK-Backend00:24:111
174356299221,8cyclictest26-21ksoftirqd/122:15:171
1743562992218,3cyclictest251rcuc/122:45:001
1743562992218,3cyclictest251rcuc/122:45:001
174356299220,20cyclictest3056-21PK-Backend19:37:381
1743559992220,1cyclictest0-21swapper/023:04:040
1743559992220,1cyclictest0-21swapper/021:17:310
174355999220,3cyclictest1776543-21memory20:40:190
174355999220,21cyclictest0-21swapper/000:02:100
174355999220,20cyclictest3056-21PK-Backend21:23:040
174355999220,20cyclictest0-21swapper/020:15:520
174355999220,20cyclictest0-21swapper/000:34:140
1743568992118,2cyclictest3056-21PK-Backend00:32:363
1743568992114,5cyclictest1791091-21sed21:20:223
1743568992112,7cyclictest883-21dbus-daemon00:00:003
174356899210,20cyclictest3056-21PK-Backend22:37:593
174356899210,20cyclictest3056-21PK-Backend22:37:593
174356899210,20cyclictest3056-21PK-Backend20:49:503
174356899210,20cyclictest3056-21PK-Backend20:49:503
174356899210,19cyclictest3056-21PK-Backend22:56:503
1743564992119,1cyclictest0-21swapper/223:58:032
1743564992119,1cyclictest0-21swapper/220:05:112
1743564992119,1cyclictest0-21swapper/200:35:022
1743564992119,1cyclictest0-21swapper/200:05:142
1743564992113,7cyclictest1763284-21apt-get20:05:002
1743564992113,5cyclictest1095-21runrttasks21:35:122
174356499210,20cyclictest0-21swapper/220:46:212
174356499210,20cyclictest0-21swapper/220:46:212
174356499210,20cyclictest0-21swapper/219:43:412
174356499210,20cyclictest0-21swapper/200:03:512
174356499210,1cyclictest0-21swapper/219:51:392
174356499210,1cyclictest0-21swapper/200:16:502
174356499210,19cyclictest3056-21PK-Backend23:35:252
174356299218,4cyclictest26-21ksoftirqd/119:15:001
174356299213,6cyclictest26-21ksoftirqd/120:40:231
174356299212,4cyclictest26-21ksoftirqd/121:33:001
1743562992119,1cyclictest3056-21PK-Backend23:33:011
1743562992119,1cyclictest3056-21PK-Backend21:13:291
1743562992119,1cyclictest3056-21PK-Backend20:59:301
1743562992119,1cyclictest0-21swapper/123:15:501
1743562992119,1cyclictest0-21swapper/122:35:221
1743562992119,1cyclictest0-21swapper/122:35:221
1743562992119,1cyclictest0-21swapper/122:26:431
1743562992119,1cyclictest0-21swapper/120:29:491
1743562992119,1cyclictest0-21swapper/120:12:251
1743562992118,2cyclictest251rcuc/119:58:311
1743562992116,4cyclictest26-21ksoftirqd/120:35:011
1743562992114,6cyclictest1749803-21df_inode19:25:121
1743562992112,3cyclictest26-21ksoftirqd/100:02:291
174356299210,19cyclictest3056-21PK-Backend21:39:391
174356299210,19cyclictest18002312sleep121:49:521
1743559992119,1cyclictest3056-21PK-Backend23:41:420
1743559992119,1cyclictest3056-21PK-Backend23:41:420
1743559992119,1cyclictest0-21swapper/023:53:510
1743559992119,1cyclictest0-21swapper/023:16:470
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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