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2026-08-30 - 15:22

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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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 Sun Aug 30, 2026 12:44:47)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
100986921090,1sleep20-21swapper/209:00:192
139099870,52rtkit-daemon0-21swapper/107:07:381
96925827740,13sleep30-21swapper/307:06:563
96805627346,17sleep00-21swapper/007:05:130
96826326943,18sleep20-21swapper/207:05:152
10713512590,3sleep00-21swapper/011:55:170
10745652410,4sleep13056-21PK-Backend12:05:121
10284902400,1chrt1028352-21/usr/sbin/munin09:55:132
9765102380,2sleep13056-21PK-Backend07:25:231
10275032320,4sleep20-21swapper/209:50:202
10625682300,5chrt0-21swapper/211:30:172
96964299298,9cyclictest992329-21taskset08:11:113
96964299298,13cyclictest0-21swapper/307:13:093
969642992912,15cyclictest993561-21awk08:15:143
969642992911,16cyclictest1052957-21cat11:05:013
10780942290,4sleep13056-21PK-Backend12:15:151
969642992822,4cyclictest913-21gdbus08:40:013
969642992811,15cyclictest981378-21ls07:40:193
969642992811,15cyclictest981378-21ls07:40:183
96964299278,10cyclictest0-21swapper/308:28:443
96964299277,12cyclictest0-21swapper/307:37:143
969642992720,5cyclictest1058728-21cpuspeed11:20:113
969642992719,4cyclictest1031842-21apt10:05:113
969642992713,13cyclictest998748-21df08:30:133
969642992713,12cyclictest983382-21python307:45:223
969642992713,12cyclictest1084325-21seq12:34:273
969642992713,12cyclictest1046354-21df10:45:123
969642992712,13cyclictest1086150-21munin-run12:40:003
96964299269,15cyclictest1012722-21cstates09:10:133
96964299267,6cyclictest1018851-21taskset09:25:583
969642992622,3cyclictest0-21swapper/312:02:183
969642992611,13cyclictest1074573-21cstates12:05:123
969642992611,13cyclictest1026836-21expr09:50:123
96964299258,4cyclictest977263-21apt07:30:123
969642992521,3cyclictest0-21swapper/308:47:373
969642992519,4cyclictest436-20systemd-journal09:01:143
969642992518,4cyclictest1062118-21apt11:30:133
969642992515,7cyclictest1075980-21taskset12:10:133
969642992512,12cyclictest1047963-21/usr/sbin/munin10:50:133
969642992512,11cyclictest1069656-21/usr/sbin/munin11:50:183
969642992511,4cyclictest1045131-21smartctl10:40:213
969642992511,13cyclictest0-21swapper/312:15:113
969642992511,12cyclictest1041798-21grep10:30:233
96964299249,13cyclictest0-21swapper/311:45:203
96964299249,12cyclictest1033587-21apt10:10:103
96964299243,2cyclictest0-21swapper/312:20:163
969642992415,6cyclictest1057775-21python311:15:223
969642992414,8cyclictest995646-21/usr/sbin/munin08:20:183
969642992412,11cyclictest986685-21ntp_kernel_err07:55:183
969642992411,11cyclictest972032-21/usr/sbin/munin07:15:133
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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