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2026-09-19 - 23:15

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 Sat Sep 19, 2026 12:44:47)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
246612799793,70cyclictest2469847-21latency_hist07:30:010
246612799742,4cyclictest0-21swapper/011:15:300
246612799741,4cyclictest2518765-21/usr/sbin/munin12:15:150
246612799722,4cyclictest2495818-21grep10:00:280
2466127997210,56cyclictest131ktimers/008:50:250
2466127997143,23cyclictest167350irq/118-8000000.ethernet-tx011:30:040
246612799701,3cyclictest0-21swapper/008:10:290
246612799691,4cyclictest2492251-21ssh09:40:210
246612799691,4cyclictest2492251-21ssh09:40:200
246612999688,35cyclictest22-21rcuc/108:35:201
2466129996836,28cyclictest231ktimers/111:45:011
246612799672,7cyclictest0-21swapper/007:15:280
246612799671,57cyclictest2486152-21latency_hist09:05:010
2466127996623,7cyclictest0-21swapper/008:55:300
246612799651,58cyclictest2489988-21ptp4l09:25:270
246612799651,58cyclictest2489988-21ptp4l09:25:270
246612799651,4cyclictest2517943-21diskstats12:10:200
246612799651,3cyclictest2480515-21tail08:30:250
246612799651,3cyclictest0-21swapper/010:15:170
246612799651,3cyclictest0-21swapper/009:10:110
246612799651,30cyclictest2510409-21/usr/sbin/munin11:25:270
246612799651,2cyclictest2486243-21df09:05:160
2466127996425,33cyclictest0-21swapper/008:40:300
246612799641,3cyclictest0-21swapper/009:50:280
246612799641,3cyclictest0-21swapper/008:15:130
246612799631,4cyclictest2522621-21gunzip12:35:290
246612799631,4cyclictest2522621-21gunzip12:35:290
246612799631,4cyclictest2521410-21df_inode12:30:180
246612799631,4cyclictest2517335-21meminfo12:05:250
246612799631,3cyclictest0-21swapper/008:20:260
246612799631,3cyclictest0-21swapper/008:20:260
246612799622,2cyclictest0-21swapper/011:05:290
246612799621,3cyclictest2515942-21uptime11:55:310
246612799621,3cyclictest2493262-21/usr/sbin/munin09:45:250
246612799621,3cyclictest0-21swapper/012:20:240
246612799621,3cyclictest0-21swapper/008:45:150
246612799621,3cyclictest0-21swapper/007:40:290
246612799621,3cyclictest0-21swapper/007:40:290
246612799612,4cyclictest2491503-21/usr/sbin/munin09:35:240
2466127996124,6cyclictest2496959-21grep10:05:270
246612799612,2cyclictest2479967-21sshd08:27:240
246612799611,55cyclictest0-21swapper/007:35:020
246612799611,53cyclictest0-21swapper/010:35:160
246612799611,3cyclictest2503259-21apt-get10:45:110
246612799611,3cyclictest0-21swapper/010:40:150
246612799611,3cyclictest0-21swapper/010:20:130
246612799611,3cyclictest0-21swapper/007:10:270
246612799601,5cyclictest2499950-21df_inode10:25:170
246612799601,4cyclictest2488995-21irqstats09:20:250
246612799601,4cyclictest2481636-21users08:35:290
246612799601,4cyclictest0-21swapper/010:30:170
246612799601,3cyclictest2473427-21apt-get07:50:130
246612799601,3cyclictest0-21swapper/011:50:130
246612799601,3cyclictest0-21swapper/009:30:180
246612799601,3cyclictest0-21swapper/007:45:220
246612799595,47cyclictest0-21swapper/007:25:010
246612799591,54cyclictest2494932-21meminfo09:55:260
246612799591,54cyclictest2494932-21meminfo09:55:260
246612799591,3cyclictest2474565-21meminfo07:55:240
246612799591,3cyclictest0-21swapper/011:40:120
246612799591,3cyclictest0-21swapper/011:35:150
246612799581,3cyclictest0-21swapper/010:10:140
246612799581,3cyclictest0-21swapper/010:10:140
2466127995724,7cyclictest2475663-21grep08:00:280
246612799571,3cyclictest0-21swapper/012:25:120
246612799571,3cyclictest0-21swapper/011:00:030
246612799562,6cyclictest2466124-21latency_hist07:10:000
246612799561,4cyclictest0-21swapper/011:20:150
246612799561,3cyclictest2505809-21ls11:00:010
246612799561,3cyclictest0-21swapper/009:15:310
246612799561,2cyclictest2504098-21apt-get10:50:120
246613299551,27cyclictest0-21swapper/212:10:202
2466129995444,6cyclictest2468063-21munin-run07:20:001
246612799541,4cyclictest0-21swapper/011:45:170
2466132995136,10cyclictest0-21swapper/207:25:292
2466132995037,9cyclictest0-21swapper/208:40:002
2466129995040,5cyclictest2503898-21munin-plugin-st10:50:001
246612799501,2cyclictest2508019-21/usr/sbin/munin11:10:300
2466132994942,5cyclictest311ktimers/212:40:012
2466132994942,5cyclictest311ktimers/212:40:012
246612799491,3cyclictest0-21swapper/007:30:180
2466129994837,7cyclictest2509039-21cron11:20:001
246612799481,3cyclictest0-21swapper/008:07:440
246612999472,13cyclictest0-21swapper/111:30:011
2466129994628,12cyclictest2502203-21munin-plugin-st10:40:001
2466129994622,11cyclictest231ktimers/110:05:141
246613299457,7cyclictest2470599-21apt-get07:35:012
246613299452,36cyclictest2496993-21unixbench_singl10:05:282
2466132994431,9cyclictest0-21swapper/211:35:022
2466129994431,8cyclictest0-21swapper/110:15:301
2466129994427,11cyclictest231ktimers/109:20:171
2466132994331,7cyclictest167550irq/134-8000000.ethernet-tx210:25:282
2466132994329,9cyclictest0-21swapper/208:15:002
2466132994327,12cyclictest2496129-21http10:05:002
2466129994320,17cyclictest231ktimers/107:40:151
2466129994320,17cyclictest231ktimers/107:40:151
2466132994228,9cyclictest0-21swapper/209:15:232
2466129994229,9cyclictest0-21swapper/111:35:301
2466132994131,5cyclictest2480763-21grep08:30:282
2466132994130,6cyclictest2466122-21cyclictest08:15:112
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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