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2026-05-15 - 00:59

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #a, 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 rackaslot8s.osadl.org (updated Thu May 14, 2026 12:45:07)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
6842221096,94sleep20-21swapper/207:05:072
85192176100,25sleep10-21swapper/107:07:051
6845217196,22sleep00-21swapper/007:05:090
84592140103,26sleep30-21swapper/307:06:203
220162610,0sleep0131rcuc/011:05:130
126202610,2sleep00-21swapper/011:45:500
127052600,1sleep30-21swapper/308:30:183
114242560,1sleep10-21swapper/112:10:071
124032550,3sleep30-21swapper/310:57:453
314682540,3sleep331462-21grep09:35:183
308852530,2sleep20-21swapper/209:35:132
294902510,1sleep00-21swapper/011:35:100
160562490,1sleep00-21swapper/011:25:070
84412480,1sleep20-21swapper/211:43:232
244602450,1sleep30-21swapper/311:30:243
52542430,2chrt0-21swapper/210:04:432
29972430,2sleep10-21swapper/112:27:201
232942410,2chrt0-21swapper/309:53:443
284202400,1sleep10-21swapper/109:33:201
276402380,2sleep20-21swapper/211:09:362
9016993712,6cyclictest5039-21cat09:15:240
9016993414,4cyclictest4928-21sh11:15:540
9016993412,6cyclictest12709-21vmstat07:15:260
9016993411,6cyclictest8386-21sed08:20:180
9016993411,5cyclictest11021-21cut07:15:000
9016993313,3cyclictest12156-21sh10:33:350
9016993311,6cyclictest12-21ksoftirqd/012:10:130
9016993310,7cyclictest829-21cut08:05:000
9016993215,3cyclictest15032-21ntp_offset10:35:200
9016993110,4cyclictest22832-21cpu11:30:110
901699302,11cyclictest26309-21apt-get10:20:120
9016993013,3cyclictest16478-21sh09:48:370
901699300,16cyclictest13503-21irqstats12:35:180
9016992913,3cyclictest14407-21sh10:10:260
9016992811,4cyclictest28795-21diskmemload12:16:000
61442270,2chrt0-21swapper/310:53:123
9018992623,2cyclictest0-21swapper/207:12:352
901799261,24cyclictest0-21swapper/107:12:381
309952260,3sleep330964-21munin-run07:59:593
104062260,1sleep30-21swapper/310:08:093
901999258,10cyclictest52850irq/140-enp3s0-11:00:123
9019992519,4cyclictest34-21ksoftirqd/307:20:003
901999251,23cyclictest0-21swapper/307:11:333
9019992511,8cyclictest9446-21ssh11:20:113
901799257,11cyclictest53050irq/142-enp3s0-12:00:121
9017992510,12cyclictest20558-21seq10:40:041
9016992517,6cyclictest6247-21cstates10:05:110
320862250,2sleep00-21swapper/011:12:190
901799243,14cyclictest22460-21chrt07:40:121
901799242,15cyclictest7314-21ssh10:30:121
9016992412,10cyclictest636-21runrttasks09:55:420
134112240,9sleep122-21ksoftirqd/109:45:321
901899230,20cyclictest20594-21ntpq10:15:192
901999222,14cyclictest19590-21ssh10:15:123
901999222,13cyclictest20700-21chrt10:40:113
9019992211,7cyclictest5860-21ntpq12:05:193
9019992210,10cyclictest2761-21cpu11:15:123
9018992214,6cyclictest23843-21ls08:55:252
9018992213,6cyclictest28904-21cat09:10:012
9018992213,6cyclictest18054-21apt-get07:30:092
9017992216,4cyclictest4402-21dump-pmu-power09:40:001
9017992212,7cyclictest18377-21df07:30:131
9017992210,8cyclictest6105-21grep09:40:231
9016992213,7cyclictest25899-21ls07:45:220
9016992213,6cyclictest19921-21cat10:15:130
27762220,2sleep00-21swapper/012:27:070
901999218,9cyclictest11505-21awk11:45:203
9019992115,4cyclictest34-21ksoftirqd/308:55:003
9019992113,6cyclictest2295-21cron11:15:003
9019992111,7cyclictest22935-21df_inode08:55:143
901899214,4cyclictest0-21swapper/209:59:262
9018992115,4cyclictest28-21ksoftirqd/208:20:002
9018992114,5cyclictest24340-21turbostat.cron07:44:592
9018992112,7cyclictest560-21dbus-daemon09:30:002
9018992111,7cyclictest25106-21python309:30:222
901799212,10cyclictest6036-21ssh12:30:101
901799212,10cyclictest6036-21ssh12:30:101
9017992114,4cyclictest53050irq/142-enp3s0-11:05:101
9017992112,7cyclictest28204-21seq12:21:491
9017992111,7cyclictest560-21dbus-daemon08:00:001
9017992111,7cyclictest16661-21fw_packets11:25:151
901699216,13cyclictest25342-21cat09:30:220
9016992115,4cyclictest31823-21grep10:00:110
9016992112,7cyclictest2681-21seq08:08:040
9016992112,6cyclictest3756-21cut08:10:140
298252210,2sleep20-21swapper/210:46:082
103742210,2sleep00-21swapper/009:44:140
96132200,2chrt0-21swapper/310:31:003
901999201,9cyclictest16261-21cut11:25:123
9019992014,4cyclictest34-21ksoftirqd/312:40:003
9019992014,4cyclictest34-21ksoftirqd/312:00:003
9019992014,4cyclictest18950irq/143-ahci[0012:20:003
9019992014,3cyclictest132882chrt09:45:263
9019992013,5cyclictest16652-21dump-pmu-power09:25:003
9019992011,7cyclictest13012-21cat12:10:243
901899202,13cyclictest22818-21ssh11:30:112
901899202,12cyclictest9428-21apt-get11:20:112
901899201,7cyclictest1483950ssh09:46:592
9018992015,3cyclictest1422-21latency10:25:192
9018992012,6cyclictest278-21systemd-journal12:00:002
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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