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2026-07-31 - 02:05

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #6

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.

Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rackeslot6s.osadl.org (updated Thu Jul 30, 2026 12:44:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3667590999860,34cyclictest311ktimers/209:00:582
366758699833,5cyclictest3717026-21sed11:50:310
366758899741,14cyclictest0-21swapper/109:25:011
3667586996934,27cyclictest3703381-21grep10:30:280
366758699672,6cyclictest3668554-21memory07:15:020
366758699663,5cyclictest3708712-21latency_hist11:05:010
366758699663,5cyclictest3683889-21apt-get08:45:020
366758699662,57cyclictest3693590-21fschecks_time09:35:210
366758699662,57cyclictest3693590-21fschecks_time09:35:210
3667586996617,19cyclictest3669517-21latency_hist07:20:010
366758899651,43cyclictest0-21swapper/111:00:011
366758899651,43cyclictest0-21swapper/111:00:011
366758899641,59cyclictest0-21swapper/107:25:011
3667590996313,15cyclictest3712134-21/usr/sbin/munin11:25:182
366758699634,5cyclictest0-21swapper/007:55:270
3667586996229,30cyclictest3694861-21grep09:40:280
3667588996139,16cyclictest0-21swapper/110:30:001
366758899613,48cyclictest3696299-21meminfo09:50:251
366758899611,38cyclictest0-21swapper/108:10:011
366758699611,56cyclictest3701711-21unixbench_multi10:20:280
366758699602,3cyclictest3683162-21cat08:40:010
3667586996011,45cyclictest0-21swapper/009:15:010
3667588995936,18cyclictest3683822-21grep08:40:291
3667588995927,22cyclictest3710170-21grep11:10:281
3667586995950,4cyclictest0-21swapper/009:00:090
3667586995930,24cyclictest0-21swapper/011:10:280
3667586995927,25cyclictest23850irq/422-mmc111:45:010
3667586995924,32cyclictest3671633-21if_err_eth107:30:220
366758899582,48cyclictest3715605-21apt-get11:45:131
3667586995831,23cyclictest3670682-21sh07:25:190
3667586995828,26cyclictest0-21swapper/008:20:260
3667586995819,36cyclictest3674560-21grep07:45:290
3667586995819,36cyclictest3674560-21grep07:45:280
3667586995819,35cyclictest0-21swapper/009:05:280
3667588995723,28cyclictest0-21swapper/111:20:271
3667588995718,31cyclictest3705179-21munin-plugin-st10:45:011
366758899571,48cyclictest3680717-21apt-get08:25:141
366758899571,48cyclictest3680717-21apt-get08:25:141
3667586995737,15cyclictest20650irq/252-8000000.ethernet10:05:010
366758699572,48cyclictest0-21swapper/010:25:190
366758699571,2cyclictest0-21swapper/009:25:010
3667588995623,25cyclictest0-21swapper/107:15:011
3667588995622,27cyclictest3677035-21grep08:00:281
3667586995625,25cyclictest0-21swapper/007:20:280
3667588995526,23cyclictest0-21swapper/108:55:291
366758899552,45cyclictest3697786-21apt-get10:00:131
3667588995522,27cyclictest0-21swapper/107:45:201
3667588995522,27cyclictest0-21swapper/107:45:201
3667588995520,28cyclictest0-21swapper/110:15:201
3667588995520,28cyclictest0-21swapper/110:15:191
3667588995520,28cyclictest0-21swapper/108:35:281
366758899551,47cyclictest3685020-21/usr/sbin/munin08:50:301
3667586995541,8cyclictest167350irq/118-8000000.ethernet-tx007:35:220
3667588995419,30cyclictest0-21swapper/110:30:191
3667588995418,30cyclictest0-21swapper/110:50:021
3667588995416,32cyclictest0-21swapper/108:30:281
3667588995416,30cyclictest3697522-21unixbench_singl09:55:291
3667588995415,33cyclictest3671997-21head07:30:281
366758899541,33cyclictest0-21swapper/110:40:011
366758699543,11cyclictest3711008-21grep11:15:280
366758699543,10cyclictest3709287-21tail11:05:310
3667586995430,20cyclictest20650irq/252-8000000.ethernet11:45:140
3667586995422,28cyclictest0-21swapper/010:00:000
3667590995342,6cyclictest3715309-21cron11:45:002
366758899533,38cyclictest3687922-21sshd09:00:581
366758899532,43cyclictest3679084-21diskstats08:15:171
3667588995324,22cyclictest3689790-21grep09:10:301
3667588995324,20cyclictest0-21swapper/111:05:001
366758899532,41cyclictest3684182-21/usr/sbin/munin08:45:201
366758899532,41cyclictest3684182-21/usr/sbin/munin08:45:201
366758899531,43cyclictest3721616-21apt-get12:20:141
3667588995314,31cyclictest0-21swapper/110:05:261
3667586995345,5cyclictest0-21swapper/010:10:130
366758699533,6cyclictest0-21swapper/010:50:230
366758699532,7cyclictest3721389-21cron12:20:000
366758699532,12cyclictest3690821-21grep09:20:010
3667586995315,31cyclictest3685657-21latency_hist08:55:010
366758699531,50cyclictest0-21swapper/011:55:280
3667590995236,11cyclictest0-21swapper/212:15:002
366758899523,38cyclictest3714767-21fschecks_count11:40:201
366758899522,43cyclictest3680399-21unixbench_multi08:20:281
3667588995224,23cyclictest0-21swapper/111:05:311
3667588995215,29cyclictest0-21swapper/109:45:231
366758899521,43cyclictest3712137-21apt-get11:25:141
3667588995211,36cyclictest3672880-21sshd07:38:101
3667586995232,16cyclictest20650irq/252-8000000.ethernet09:45:260
3667586995226,23cyclictest3673114-21/usr/sbin/munin07:40:280
366758899513,40cyclictest3720499-21latency_hist12:15:001
3667588995126,22cyclictest1660-21snmpd09:15:111
366758899511,42cyclictest3676172-21grep07:55:291
3667588995113,28cyclictest0-21swapper/109:05:191
3667588995112,34cyclictest1660-21snmpd09:39:111
3667588995112,34cyclictest1660-21snmpd09:39:101
366758899511,11cyclictest3668875-21/usr/sbin/munin07:15:301
3667586995132,15cyclictest20650irq/252-8000000.ethernet09:30:010
3667586995130,17cyclictest20650irq/252-8000000.ethernet11:20:270
3667586995130,16cyclictest3692761-21sh09:30:220
366758699512,10cyclictest3679129-21grep08:15:190
3667586995120,27cyclictest0-21swapper/011:35:250
3667586995120,27cyclictest0-21swapper/011:35:250
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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