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2026-08-23 - 00:33

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 Aug 22, 2026 12:44:47)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
292119399873,38cyclictest1831782-1kworker/1:0H+kblockd11:55:041
2921193998436,19cyclictest0-21swapper/109:55:011
2921192997613,57cyclictest131ktimers/009:05:210
292119299731,7cyclictest0-21swapper/010:25:010
2921193996612,20cyclictest2944616-21/usr/sbin/munin09:25:221
292119299661,61cyclictest2940031-21grep08:55:290
2921192996528,30cyclictest23850irq/422-mmc111:55:020
292119299651,6cyclictest2950287-21/usr/sbin/munin09:55:280
2921192996435,26cyclictest0-21swapper/008:35:290
2921192996433,27cyclictest20650irq/252-8000000.ethernet10:00:180
292119299642,9cyclictest2973395-21sed12:10:290
2921192996426,34cyclictest20650irq/252-8000000.ethernet11:30:290
292119299641,8cyclictest2921984-21sshd07:14:470
2921192996348,8cyclictest0-21swapper/007:25:120
292119299631,51cyclictest0-21swapper/007:10:010
292119299631,51cyclictest0-21swapper/007:10:010
2921192996228,31cyclictest20850irq/208-8000000.ethernet11:10:220
2921192996138,20cyclictest20650irq/252-8000000.ethernet11:00:260
2921192996125,28cyclictest20650irq/252-8000000.ethernet08:15:170
2921192996052,2cyclictest0-21swapper/012:05:010
2921192996026,31cyclictest20850irq/208-8000000.ethernet10:50:240
2921192995929,26cyclictest0-21swapper/009:20:260
2921192995925,29cyclictest0-21swapper/008:30:300
2921192995922,33cyclictest2946930-21sed09:35:290
2921192995916,40cyclictest1660-21snmpd11:48:120
2921192995913,44cyclictest0-21swapper/008:30:010
2921192995913,44cyclictest0-21swapper/008:30:010
2921192995827,28cyclictest20650irq/252-8000000.ethernet11:35:180
2921192995735,18cyclictest2928277-21cron07:50:000
2921192995735,18cyclictest2928277-21cron07:50:000
2921192995734,20cyclictest20650irq/252-8000000.ethernet08:00:000
2921192995728,25cyclictest2949462-21unixbench_multi09:50:270
292119299572,4cyclictest2928631-21cut07:50:200
292119299571,4cyclictest2965464-21/usr/sbin/munin11:25:260
292119299571,2cyclictest0-21swapper/007:20:170
292119299563,6cyclictest2955263-21phc2sys10:25:270
292119299563,4cyclictest2922236-21lsblk07:15:020
2921192995634,19cyclictest20650irq/252-8000000.ethernet11:55:220
2921196995542,8cyclictest0-21swapper/210:05:012
2921192995534,16cyclictest20650irq/252-8000000.ethernet09:35:020
2921192995529,21cyclictest0-21swapper/012:20:280
2921192995526,26cyclictest20850irq/208-8000000.ethernet12:00:160
292119299552,4cyclictest2951914-21ps10:05:260
2921192995519,31cyclictest0-21swapper/010:40:280
2921192995519,31cyclictest0-21swapper/010:40:280
292119299551,5cyclictest2955837-21df_inode10:30:180
292119299551,3cyclictest2977508-21/usr/sbin/munin12:35:290
2921196995439,10cyclictest0-21swapper/212:25:002
292119299543,6cyclictest0-21swapper/007:40:000
2921192995424,26cyclictest20650irq/252-8000000.ethernet10:10:200
292119299541,3cyclictest2942993-21diskstats09:15:190
292119299541,2cyclictest0-21swapper/008:55:020
292119299532,6cyclictest2947841-21grep09:40:300
292119299532,10cyclictest2960160-21cut10:55:210
292119299531,10cyclictest2976482-21irqstats12:30:240
2921196995243,5cyclictest2970949-21munin-plugin-st12:00:002
292119299524,5cyclictest2957158-21sed10:35:290
292119299521,4cyclictest2942259-21perl09:10:210
292119299521,49cyclictest0-21swapper/008:40:170
2921193995143,5cyclictest231ktimers/108:10:001
292119299518,39cyclictest0-21swapper/011:05:300
292119299513,4cyclictest0-21swapper/009:00:190
292119299511,7cyclictest2968154-21/usr/sbin/munin11:40:270
292119299505,4cyclictest0-21swapper/010:15:270
292119299504,4cyclictest0-21swapper/008:45:200
2921192995025,22cyclictest20650irq/252-8000000.ethernet10:45:190
292119299502,4cyclictest2975571-21tune2fs12:25:230
292119299502,4cyclictest2975571-21tune2fs12:25:220
2921192995023,24cyclictest20650irq/252-8000000.ethernet08:20:110
292119299501,8cyclictest2973743-21/usr/sbin/munin12:15:160
292119299501,8cyclictest2963905-21/usr/sbin/munin11:15:280
2921192995012,33cyclictest0-21swapper/007:30:280
2921192994925,18cyclictest2964510-21fschecks_time11:20:220
2921193994840,5cyclictest2924909-21grep07:30:001
2921192994827,17cyclictest20650irq/252-8000000.ethernet08:10:180
292119299482,5cyclictest2931319-21/usr/sbin/munin08:05:260
2921192994819,26cyclictest2948259-21cut09:45:210
292119299481,3cyclictest2930251-21diskstats08:00:190
2921192994810,25cyclictest2593955-1kworker/0:1H+kblockd07:45:010
2921196994737,6cyclictest2925666-21grep07:30:292
292119699473,29cyclictest30-21rcuc/209:30:002
2921196994731,9cyclictest0-21swapper/209:55:302
2921196994727,11cyclictest0-21swapper/210:20:002
2921193994737,7cyclictest2936723-21sendmail08:40:011
292119699466,15cyclictest2921187-21cyclictest12:10:202
292119399461,11cyclictest0-21swapper/107:10:011
292119399461,11cyclictest0-21swapper/107:10:011
292119399443,9cyclictest2922207-21munin-node07:15:021
2921193994436,5cyclictest2924073-21munin-plugin-st07:25:001
2921193994431,8cyclictest0-21swapper/108:40:321
292119299441,8cyclictest2944957-21/usr/sbin/munin09:25:280
2921196994336,4cyclictest2972647-21munin-plugin-st12:10:002
2921196994331,7cyclictest0-21swapper/210:10:282
2921196994330,6cyclictest2952093-21grep10:05:282
2921196994329,9cyclictest0-21swapper/207:40:222
2921193994333,4cyclictest2953033-21munin-plugin-st10:15:011
2921193994329,10cyclictest0-21swapper/111:50:281
2921193994326,13cyclictest0-21swapper/112:30:271
2921196994230,7cyclictest2958076-21grep10:40:302
2921196994230,7cyclictest2958076-21grep10:40:302
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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