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2026-09-10 - 16:18

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 Sep 10, 2026 12:44:47)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2899822997642,29cyclictest2918725-21munin-plugin-st09:00:012
2899822997641,30cyclictest2919577-21munin-plugin-st09:05:002
2899822997235,32cyclictest0-21swapper/208:40:302
289981999601,43cyclictest0-21swapper/110:15:011
2899817996030,25cyclictest2939503-21grep11:00:190
2899822995719,21cyclictest880-21avahi-daemon11:50:182
2899822995719,21cyclictest880-21avahi-daemon11:50:182
2899817995725,28cyclictest0-21swapper/010:10:260
2899817995619,33cyclictest0-21swapper/007:15:250
2899817995619,33cyclictest0-21swapper/007:15:250
289981999555,41cyclictest2922954-21apt-get09:25:001
2899817995545,4cyclictest2900668-21latency_hist07:15:000
2899817995523,28cyclictest0-21swapper/009:40:270
2899817995523,28cyclictest0-21swapper/009:40:270
2899819995345,5cyclictest2922104-21grep09:19:591
2899822995245,4cyclictest2933184-21munin-plugin-st10:25:012
2899822995245,4cyclictest2933184-21munin-plugin-st10:25:012
289981999526,35cyclictest22-21rcuc/110:55:011
2899819995237,10cyclictest0-21swapper/107:44:591
289981999513,35cyclictest22-21rcuc/107:30:011
2899819995133,10cyclictest2904178-21grep07:30:281
2899817995144,4cyclictest167350irq/118-8000000.ethernet-tx011:15:250
289981799511,29cyclictest0-21swapper/012:25:000
2899817995112,27cyclictest2936628-21kworker/u8:5+events_power_efficient10:50:020
2899822994942,4cyclictest2928932-21cron10:00:012
289981999492,21cyclictest2717854-1kworker/1:2H+kblockd10:40:101
289981799497,33cyclictest0-21swapper/012:15:010
289981799491,33cyclictest0-21swapper/011:40:000
289981999488,19cyclictest231ktimers/109:50:011
2899819994833,10cyclictest0-21swapper/112:15:001
2899819994832,11cyclictest0-21swapper/109:10:231
2899817994840,5cyclictest20850irq/208-8000000.ethernet08:25:260
2899817994837,6cyclictest2918428-21phc2sys-jitter08:55:250
289981799471,2cyclictest0-21swapper/009:20:010
289981799471,15cyclictest0-21swapper/007:55:000
2899817994639,4cyclictest167350irq/118-8000000.ethernet-tx007:30:380
289981799462,39cyclictest0-21swapper/009:25:010
2899819994528,12cyclictest0-21swapper/107:20:011
2899819994528,12cyclictest0-21swapper/107:20:011
289981999451,9cyclictest0-21swapper/109:50:011
2899817994538,4cyclictest167350irq/118-8000000.ethernet-tx009:30:230
2899817994538,4cyclictest167350irq/118-8000000.ethernet-tx009:00:250
2899817994537,5cyclictest0-21swapper/008:05:200
289981799452,4cyclictest2903393-21sed07:25:270
289981799451,9cyclictest2911769-21/usr/sbin/munin08:15:270
289981799451,29cyclictest0-21swapper/008:15:010
2899819994430,9cyclictest0-21swapper/107:55:271
2899819994430,10cyclictest231ktimers/109:25:101
2899817994440,2cyclictest0-21swapper/012:35:200
2899817994429,10cyclictest2916593-21fschecks_time08:45:190
289981799442,5cyclictest2929360-21perl10:00:210
289981799441,19cyclictest0-21swapper/012:20:010
2899822994331,8cyclictest0-21swapper/209:25:252
289981999431,15cyclictest0-21swapper/108:05:021
2899817994336,4cyclictest20850irq/208-8000000.ethernet08:20:190
2899817994336,4cyclictest167350irq/118-8000000.ethernet-tx010:35:150
2899817994336,4cyclictest0-21swapper/009:45:220
2899822994234,5cyclictest2951834-21munin-plugin-st12:15:002
2899819994235,4cyclictest2935708-21sendmail10:40:011
2899819994233,5cyclictest2928946-21munin-plugin-st10:00:001
2899819994232,6cyclictest2953432-21grep12:20:281
2899819994229,9cyclictest2913562-21grep08:25:291
289981999421,2cyclictest0-21swapper/112:30:011
2899817994228,10cyclictest0-21swapper/012:25:290
289981799421,4cyclictest2948122-21sshd11:50:240
289981799421,4cyclictest2948122-21sshd11:50:240
289981799421,37cyclictest1660-21snmpd10:25:160
289981799421,32cyclictest0-21swapper/007:55:010
2899819994133,4cyclictest167450irq/126-8000000.ethernet-tx112:05:241
2899819994126,7cyclictest0-21swapper/111:10:301
2899819994123,10cyclictest0-21swapper/108:30:271
289981799411,3cyclictest2904897-21ptp4l07:35:260
289981799411,34cyclictest0-21swapper/007:25:010
2899819994031,5cyclictest2947576-21grep11:45:281
2899819994031,5cyclictest0-21swapper/112:20:001
2899819994029,7cyclictest0-21swapper/110:55:281
2899819994024,11cyclictest231ktimers/108:35:131
289981999401,29cyclictest14-21rcu_preempt11:25:221
2899817994035,3cyclictest167350irq/118-8000000.ethernet-tx007:40:190
2899817994033,4cyclictest0-21swapper/008:50:280
2899817994032,4cyclictest0-21swapper/009:50:250
2899817994022,16cyclictest2948979-21/usr/sbin/munin11:55:260
289981799401,8cyclictest0-21swapper/010:45:010
289981799401,2cyclictest0-21swapper/009:05:010
2899822993932,4cyclictest167550irq/134-8000000.ethernet-tx209:15:112
2899822993930,4cyclictest0-21swapper/212:20:202
2899822993927,8cyclictest0-21swapper/210:25:272
2899822993925,10cyclictest1660-21snmpd09:45:232
2899822993924,10cyclictest0-21swapper/209:05:202
2899819993931,4cyclictest2956043-21cron12:40:001
2899819993929,5cyclictest2902609-21munin-plugin-st07:25:001
2899819993925,9cyclictest0-21swapper/107:10:261
2899819993925,8cyclictest0-21swapper/108:20:271
2899819993925,10cyclictest0-21swapper/112:05:001
289981999391,32cyclictest0-21swapper/111:00:221
2899817993932,4cyclictest167350irq/118-8000000.ethernet-tx011:20:240
289981799392,8cyclictest0-21swapper/011:35:010
289981799391,3cyclictest0-21swapper/011:25:170
289981799391,36cyclictest2947681-21sed11:50:010
289981799391,36cyclictest0-21swapper/009:10:220
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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