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2026-07-19 - 16:37

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #1

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, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rack4slot1s.osadl.org (updated Sun Jul 19, 2026 12:44:21)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1504021280,3sleep30-21swapper/310:33:503
1504021280,3sleep30-21swapper/310:33:503
2428121230,3chrt0-21swapper/312:28:273
2428121230,3chrt0-21swapper/312:28:273
2428121230,3chrt0-21swapper/312:28:273
2468521150,2sleep30-21swapper/312:28:393
2468521150,2sleep30-21swapper/312:28:393
2468521150,2sleep30-21swapper/312:28:393
1599621110,4sleep30-21swapper/312:03:463
1599621110,4sleep30-21swapper/312:03:463
1599621110,4sleep30-21swapper/312:03:463
295212860,1chrt29520-21ntp_states11:13:441
295212860,1chrt29520-21ntp_states11:13:441
295212860,1chrt29520-21ntp_states11:13:441
293502810,1sleep00-21swapper/009:48:360
124062720,3sleep00-21swapper/010:28:400
124062720,3sleep00-21swapper/010:28:400
288592640,1sleep127935-21/usr/sbin/munin08:18:461
288592640,1sleep127935-21/usr/sbin/munin08:18:461
121482570,3chrt12136-21switchtime07:33:490
121482570,3chrt12136-21switchtime07:33:490
121482570,3chrt12136-21switchtime07:33:490
104812570,2sleep30-21swapper/311:48:473
104812570,2sleep30-21swapper/311:48:473
104812570,2sleep30-21swapper/311:48:473
146142550,3sleep00-21swapper/010:33:470
146142550,3sleep00-21swapper/010:33:470
195272530,2sleep30-21swapper/307:53:463
172282530,2chrt17224-21tune2fs12:08:380
85432510,2sleep08703-21timerwakeupswit11:43:460
85432510,2sleep08703-21timerwakeupswit11:43:460
85432510,2sleep08703-21timerwakeupswit11:43:460
149032510,2chrt0-21swapper/007:43:340
149032510,2chrt0-21swapper/007:43:340
149032510,2chrt0-21swapper/007:43:340
297842480,2sleep016-21ksoftirqd/009:48:400
297842480,2sleep016-21ksoftirqd/009:48:400
297842480,2sleep016-21ksoftirqd/009:48:400
254822480,3chrt25481-21kernelversion11:03:391
254822480,3chrt25481-21kernelversion11:03:391
254822480,3chrt25481-21kernelversion11:03:391
118552480,3chrt0-21swapper/311:53:413
118552480,3chrt0-21swapper/311:53:413
161302450,3sleep00-21swapper/012:03:470
161302450,3sleep00-21swapper/012:03:470
390199441,6cyclictest14506-21runrttasks07:41:131
390199441,6cyclictest14506-21runrttasks07:41:131
390199441,6cyclictest14506-21runrttasks07:41:131
143972440,3sleep00-21swapper/009:08:360
143972440,3sleep00-21swapper/009:08:360
150882430,3sleep0171ktimers/007:43:380
150882430,3sleep0171ktimers/007:43:380
260102420,3sleep20-21swapper/208:13:322
260102420,3sleep20-21swapper/208:13:322
390199391,10cyclictest13192-21ntp_states09:03:441
390199391,10cyclictest13192-21ntp_states09:03:441
390199381,7cyclictest32186-21sshd11:22:161
390199381,7cyclictest32186-21sshd11:22:161
390199381,7cyclictest32186-21sshd11:22:161
390199381,12cyclictest5693-21ntp_states08:43:451
390199381,12cyclictest5693-21ntp_states08:43:451
390199381,12cyclictest26602-21irqstats08:13:401
390199381,12cyclictest26602-21irqstats08:13:401
390199381,12cyclictest26602-21irqstats08:13:401
3899993830,6cyclictest22854-21threads09:28:470
3899993830,6cyclictest22854-21threads09:28:470
3899993829,7cyclictest10787-21netstat10:23:430
3899993829,7cyclictest10787-21netstat10:23:430
3899993829,7cyclictest10787-21netstat10:23:430
270212380,4sleep20-21swapper/208:13:472
270212380,4sleep20-21swapper/208:13:472
270212380,4sleep20-21swapper/208:13:472
267292380,2sleep20-21swapper/212:33:402
267292380,2sleep20-21swapper/212:33:402
267292380,2sleep20-21swapper/212:33:402
237512380,3sleep20-21swapper/212:23:472
237512380,3sleep20-21swapper/212:23:472
237512380,3sleep20-21swapper/212:23:472
390199379,25cyclictest14678-21systemd-journal07:33:151
390199379,25cyclictest14678-21systemd-journal07:33:151
390199371,9cyclictest15680-21ntp_states07:43:451
390199371,9cyclictest15680-21ntp_states07:43:451
3901993717,18cyclictest0-21swapper/110:28:421
3901993717,18cyclictest0-21swapper/110:28:421
390199371,6cyclictest31333-21sshd08:26:161
390199371,6cyclictest31333-21sshd08:26:161
3901993715,20cyclictest3865-21cyclictest10:48:461
3901993715,20cyclictest3865-21cyclictest10:48:461
3901993715,20cyclictest3865-21cyclictest10:48:461
390199371,10cyclictest15041-21unixbench_multi10:33:501
390199371,10cyclictest15041-21unixbench_multi10:33:501
3899993728,7cyclictest19103-21threads09:18:470
3899993728,7cyclictest19103-21threads09:18:470
390199361,9cyclictest8159-21/usr/sbin/munin10:18:341
390199361,9cyclictest8159-21/usr/sbin/munin10:18:341
390199361,9cyclictest19552-21grep07:53:461
390199361,9cyclictest17036-21perl07:48:391
390199361,9cyclictest17036-21perl07:48:391
390199361,8cyclictest26652-21timerandwakeup09:38:501
390199361,8cyclictest26652-21timerandwakeup09:38:501
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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