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2026-08-18 - 18:08

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 Tue Aug 18, 2026 12:44:47)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
359258099862,82cyclictest0-21swapper/008:00:150
359258099688,18cyclictest3593406-21munin-node07:15:000
3592582996514,26cyclictest3602471-21gpg-connect-age08:05:021
3592582995241,8cyclictest3635670-21munin-plugin-st11:19:591
3592582995240,8cyclictest3623857-21munin-plugin-st10:10:001
3592582995214,13cyclictest3609149-21apt-get08:45:021
3592580995143,5cyclictest3617015-21munin-plugin-st09:30:000
3592580995139,9cyclictest0-21swapper/008:55:010
359258599507,21cyclictest311ktimers/207:40:002
3592585995039,7cyclictest3594526-21sendmail07:20:002
3592585995034,8cyclictest311ktimers/210:00:152
3592585994935,10cyclictest3609149-21apt-get08:45:012
3592580994915,31cyclictest0-21swapper/009:20:280
3592585994835,9cyclictest0-21swapper/207:45:292
3592585994835,4cyclictest167550irq/134-8000000.ethernet-tx208:23:232
3592585994834,10cyclictest3625452-21grep10:15:272
3592585994834,10cyclictest3625452-21grep10:15:272
3592582994840,4cyclictest3644209-21munin-plugin-st12:09:591
3592585994738,5cyclictest3596306-21munin-plugin-st07:30:002
3592585994731,11cyclictest311ktimers/212:30:132
3592582994735,8cyclictest0-21swapper/111:30:281
3592585994634,7cyclictest3603973-21grep08:10:272
3592585994630,6cyclictest0-21swapper/209:25:022
3592582994633,8cyclictest0-21swapper/111:35:301
3592582994633,8cyclictest0-21swapper/111:35:301
3592580994639,4cyclictest3598843-21munin-plugin-st07:45:010
3592580994636,7cyclictest20850irq/208-8000000.ethernet08:10:280
3592585994532,5cyclictest0-21swapper/209:55:282
3592585994529,9cyclictest0-21swapper/208:05:292
3592585994529,9cyclictest0-21swapper/207:15:022
3592582994533,7cyclictest0-21swapper/108:40:301
3592582994531,10cyclictest0-21swapper/108:10:281
3592582994530,9cyclictest0-21swapper/111:50:291
3592582994530,9cyclictest0-21swapper/111:50:291
3592582994527,11cyclictest0-21swapper/107:15:011
3592585994433,5cyclictest0-21swapper/211:40:202
3592585994432,7cyclictest0-21swapper/212:15:212
3592585994431,8cyclictest3627198-21grep10:25:292
3592582994436,4cyclictest3627229-21cron10:30:001
3592582994430,9cyclictest0-21swapper/111:40:281
3592582994430,9cyclictest0-21swapper/109:20:291
3592582994430,8cyclictest0-21swapper/109:45:281
3592582994430,10cyclictest0-21swapper/108:40:001
3592582994426,11cyclictest0-21swapper/111:55:281
3592580994429,11cyclictest0-21swapper/012:00:220
359258099441,40cyclictest0-21swapper/010:30:120
3592585994331,8cyclictest0-21swapper/211:10:282
3592585994330,9cyclictest0-21swapper/208:30:292
3592585994327,10cyclictest0-21swapper/211:35:012
3592585994323,13cyclictest0-21swapper/207:20:242
3592582994332,7cyclictest0-21swapper/111:00:291
3592582994331,8cyclictest0-21swapper/107:25:021
3592582994330,9cyclictest0-21swapper/112:25:011
3592582994330,9cyclictest0-21swapper/112:25:011
3592582994330,9cyclictest0-21swapper/107:55:311
3592582994329,9cyclictest0-21swapper/109:15:301
3592582994329,9cyclictest0-21swapper/107:50:281
3592582994328,10cyclictest0-21swapper/108:15:281
3592580994334,6cyclictest3641581-21munin-plugin-st11:55:010
3592580994334,6cyclictest3641581-21munin-plugin-st11:55:010
3592580994333,6cyclictest0-21swapper/012:35:290
3592580994328,11cyclictest0-21swapper/007:15:250
359258099431,40cyclictest0-21swapper/009:10:270
3592585994232,7cyclictest3611740-21grep08:55:292
3592585994230,7cyclictest0-21swapper/212:05:292
3592585994230,7cyclictest0-21swapper/210:55:212
3592585994230,7cyclictest0-21swapper/210:55:212
3592585994229,9cyclictest0-21swapper/212:30:002
3592585994228,7cyclictest3602214-21grep08:00:292
3592585994225,6cyclictest0-21swapper/210:40:002
3592582994234,6cyclictest3649362-21sendmail12:39:591
3592582994230,7cyclictest0-21swapper/112:10:291
3592582994229,9cyclictest0-21swapper/111:45:291
3592582994227,9cyclictest0-21swapper/108:25:301
3592582994227,7cyclictest0-21swapper/112:30:011
3592580994230,8cyclictest0-21swapper/008:25:010
3592580994227,10cyclictest0-21swapper/007:45:200
359258099422,3cyclictest3636121-21if_eth111:20:240
3592585994128,8cyclictest3598782-21grep07:40:282
3592585994124,12cyclictest0-21swapper/212:15:012
359258599411,23cyclictest3592576-21cyclictest10:15:012
3592582994132,4cyclictest3625554-21sendmail10:20:011
3592582994132,4cyclictest3625554-21sendmail10:20:011
3592582994130,8cyclictest0-21swapper/110:00:291
3592582994129,8cyclictest0-21swapper/109:55:291
3592582994128,9cyclictest0-21swapper/109:35:301
3592582994127,9cyclictest0-21swapper/110:40:301
3592582994127,9cyclictest0-21swapper/107:25:291
3592582994124,10cyclictest0-21swapper/112:15:291
3592580994135,5cyclictest0-21swapper/010:40:130
359258099413,35cyclictest3642423-21munin-run12:00:000
3592580994132,5cyclictest0-21swapper/010:00:000
3592580994131,6cyclictest0-21swapper/009:05:300
3592580994130,8cyclictest0-21swapper/010:50:010
3592580994129,9cyclictest0-21swapper/008:35:000
3592580994128,8cyclictest0-21swapper/009:45:290
3592585994029,5cyclictest0-21swapper/209:10:272
3592585994028,7cyclictest0-21swapper/209:45:282
3592585994027,7cyclictest0-21swapper/209:15:282
3592585994026,6cyclictest0-21swapper/209:35:212
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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