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2026-05-18 - 07:41

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 Mon May 18, 2026 00:44:48)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
61994922480,5sleep10-21swapper/119:05:141
63763821190,4sleep234-21ksoftirqd/219:55:122
6452152980,4sleep23056-21PK-Backend20:15:172
7363442970,2sleep33056-21PK-Backend00:35:143
62107828341,14sleep30-21swapper/319:09:313
62108527141,25sleep00-21swapper/019:09:360
6473242640,4sleep23056-21PK-Backend20:20:222
61964226443,14sleep20-21swapper/219:05:082
6703582500,1sleep30-21swapper/321:25:193
6814962470,3sleep00-21swapper/022:00:010
6339262450,1sleep10-21swapper/119:45:021
621287993112,17cyclictest718062-21cron23:45:003
621287993111,18cyclictest718332-21find23:45:133
62128799293,25cyclictest728756-21cron00:15:003
62128799293,25cyclictest728756-21cron00:15:003
621287992914,13cyclictest687346-21kernelversion22:15:173
6954662280,16sleep234-21ksoftirqd/222:40:012
62128799289,5cyclictest732645-21tr00:25:113
62128799288,5cyclictest727103-21date00:10:003
621287992813,13cyclictest731146-21diskstats00:20:143
6262802270,3sleep0161rcuc/019:20:220
621287992718,7cyclictest883-21dbus-daemon23:24:413
6454972260,3chrt644712-21/usr/sbin/munin20:15:201
62128799268,5cyclictest668018-21expr21:20:143
62128799267,5cyclictest725414-21wc00:04:593
62128799266,5cyclictest699068-21cat22:50:123
62128799259,5cyclictest1-21systemd23:28:013
62128799258,5cyclictest729378-21ls00:15:143
62128799258,4cyclictest653751-21expr20:40:133
62128799258,3cyclictest641501-21kernelversion20:05:183
62128799257,16cyclictest685751-21sed22:10:183
62128799257,16cyclictest685751-21sed22:10:173
62128799256,5cyclictest701651-21cat22:55:213
62128799256,4cyclictest648792-21ls20:25:163
621287992510,4cyclictest708328-21hddtemp_smartct23:15:163
62128799250,1cyclictest3056-21PK-Backend21:40:183
62128799250,19cyclictest0-21swapper/319:55:423
7263942240,2sleep00-21swapper/000:05:200
6957722240,5sleep20-21swapper/222:40:132
62128799245,5cyclictest705335-21sshd23:05:553
7085322230,3sleep20-21swapper/223:15:182
62128799238,5cyclictest632454-21cat19:40:133
62128799237,3cyclictest639826-21latency20:00:163
62128799237,3cyclictest0-21swapper/321:35:203
62128799230,22cyclictest720711-21diskstats23:50:153
62128799230,22cyclictest622615-21runrttasks19:11:153
62128799230,10cyclictest702867-21/usr/sbin/munin23:00:163
621286992315,6cyclictest640746-21cron20:05:002
621278992316,4cyclictest690056-21idleruntime-cro22:25:000
139099230,15rtkit-daemon0-21swapper/219:14:562
62128799227,4cyclictest2156-21gnome-shell21:19:093
62128799221,8cyclictest627522-21diskstats19:25:143
621287992214,6cyclictest698344-21users22:45:233
62128799221,11cyclictest659000-21tr20:55:113
62128799220,12cyclictest630590-21/usr/sbin/munin19:35:153
621286992220,1cyclictest0-21swapper/221:55:062
621286992220,1cyclictest0-21swapper/219:15:192
621286992213,7cyclictest641401-21awk20:05:172
62128699220,21cyclictest731487-21ntpq00:20:182
621278992220,1cyclictest0-21swapper/023:52:150
621278992220,1cyclictest0-21swapper/023:28:220
621278992220,1cyclictest0-21swapper/021:32:090
621278992220,1cyclictest0-21swapper/021:22:290
621278992220,1cyclictest0-21swapper/020:34:500
621278992220,1cyclictest0-21swapper/020:07:260
621278992220,1cyclictest0-21swapper/019:40:420
621278992220,1cyclictest0-21swapper/000:03:100
621278992215,5cyclictest656602-21turbostat.cron20:50:000
621278992215,4cyclictest635556-21ls19:50:000
621278992210,8cyclictest1-21systemd21:45:000
62127899220,21cyclictest0-21swapper/022:31:230
621287992118,2cyclictest3056-21PK-Backend22:28:583
621287992117,3cyclictest3056-21PK-Backend22:31:493
621287992117,3cyclictest3056-21PK-Backend21:55:253
621286992113,6cyclictest653123-21cron20:40:002
62128699210,20cyclictest0-21swapper/220:53:072
621281992113,6cyclictest643000-21awk20:10:101
621281992113,6cyclictest643000-21awk20:10:101
62128199210,3cyclictest662088-21munin-run21:05:011
62128199210,2cyclictest664262-21cnf-update-db21:10:011
62128199210,20cyclictest0-21swapper/122:30:181
62128199210,19cyclictest3056-21PK-Backend23:26:221
62128199210,19cyclictest3056-21PK-Backend20:28:581
62128199210,19cyclictest3056-21PK-Backend00:15:161
62128199210,19cyclictest3056-21PK-Backend00:10:561
62128199210,19cyclictest3056-21PK-Backend00:10:561
62127899212,14cyclictest643866-21taskset20:10:200
62127899212,14cyclictest643866-21taskset20:10:200
621278992119,1cyclictest0-21swapper/023:37:480
621278992119,1cyclictest0-21swapper/023:01:180
621278992119,1cyclictest0-21swapper/022:27:320
621278992119,1cyclictest0-21swapper/020:42:070
621278992119,1cyclictest0-21swapper/020:35:510
621278992118,2cyclictest0-21swapper/000:14:050
621278992118,2cyclictest0-21swapper/000:14:050
621278992114,6cyclictest735728-21systemctl00:35:000
62127899210,20cyclictest0-21swapper/023:55:320
62127899210,20cyclictest0-21swapper/023:14:500
62127899210,20cyclictest0-21swapper/023:14:500
62127899210,20cyclictest0-21swapper/019:56:580
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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