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2026-01-07 - 19:03

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 50 highest latencies:
System rackcslot7s.osadl.org (updated Wed Jan 07, 2026 12:44:53)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
225757421240,7sleep2331rcuc/207:05:122
23539272770,3sleep00-21swapper/011:35:130
197399750,14rtkit-daemon4497-21PK-Backend10:13:361
197399710,4rtkit-daemon4497-21PK-Backend09:22:050
197399710,4rtkit-daemon0-21swapper/011:20:200
225829227045,16sleep10-21swapper/107:05:241
22611372650,5sleep10-21swapper/107:15:031
225781026343,12sleep30-21swapper/307:05:133
23711072620,13chrt2371109-21cpuspeed_turbos12:25:143
225865326141,14sleep00-21swapper/007:06:020
197399600,8rtkit-daemon1972-21rtkit-daemon09:35:290
197399590,9rtkit-daemon1972-21rtkit-daemon10:23:190
197399580,9rtkit-daemon1972-21rtkit-daemon09:10:231
197399580,8rtkit-daemon1972-21rtkit-daemon07:19:150
197399570,8rtkit-daemon1972-21rtkit-daemon08:40:190
197399560,9rtkit-daemon1972-21rtkit-daemon09:06:240
225912299530,48cyclictest1972-21rtkit-daemon09:55:220
197399530,8rtkit-daemon1972-21rtkit-daemon09:56:521
197399530,8rtkit-daemon1972-21rtkit-daemon09:17:191
2259131995220,10cyclictest2321294-21systemd-udevd10:03:292
197399520,8rtkit-daemon1972-21rtkit-daemon11:31:051
2259127995010,19cyclictest26-21ksoftirqd/111:55:131
225912299500,46cyclictest1972-21rtkit-daemon10:49:080
197399500,6rtkit-daemon1972-21rtkit-daemon07:26:071
2259127994919,26cyclictest2286095-21/usr/sbin/munin08:25:271
23455742480,9sleep126-21ksoftirqd/111:10:301
23543442470,6sleep30-21swapper/311:35:243
225912299470,43cyclictest1972-21rtkit-daemon11:32:190
225912299470,43cyclictest1972-21rtkit-daemon10:06:130
2259131994522,10cyclictest34-21ksoftirqd/210:15:162
2259122994526,15cyclictest1-21systemd10:20:010
2259133994425,15cyclictest1054-21snmpd07:48:153
23399462430,5sleep2331rcuc/210:55:302
2259122994327,12cyclictest2321450-21cron10:05:000
2259133994229,9cyclictest42-21ksoftirqd/311:28:363
2259133994218,20cyclictest2306884-21sshd09:20:453
2259131994222,17cyclictest2347379-21sshd11:15:462
22903402410,17sleep234-21ksoftirqd/208:35:252
2259133994122,15cyclictest42-21ksoftirqd/311:55:133
2259133994122,13cyclictest42-21ksoftirqd/309:25:463
2259133994116,21cyclictest2294512-21latency_hist08:50:033
2259131994122,6cyclictest34-21ksoftirqd/207:45:012
2259127994124,12cyclictest438-20systemd-journal07:44:591
2259127994120,12cyclictest26-21ksoftirqd/107:55:161
225912299412,20cyclictest438-20systemd-journal10:55:000
225912299411,11cyclictest2351596-21turbostat11:29:590
2259133994023,13cyclictest42-21ksoftirqd/310:20:273
2259133994023,13cyclictest42-21ksoftirqd/307:37:593
2259133994023,13cyclictest42-21ksoftirqd/307:37:583
2259133994021,15cyclictest1054-21snmpd09:13:313
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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