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2025-08-30 - 00:59

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 20 highest latencies:
System rackeslot6s.osadl.org (updated Fri Aug 29, 2025 12:44:45)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
324058099768,11cyclictest3294323-21apt-get12:25:010
324058099633,54cyclictest0-21swapper/007:35:180
324058599591,30cyclictest0-21swapper/210:10:012
3240585995637,13cyclictest311ktimers/209:15:172
3240582995233,9cyclictest0-21swapper/111:00:291
3240582995140,6cyclictest3273104-21run-parts10:20:001
3240582995136,7cyclictest3249199-21grep07:55:301
324058599501,2cyclictest0-21swapper/211:15:022
3240585994931,13cyclictest0-21swapper/210:20:312
3240580994940,6cyclictest3240574-21cyclictest09:20:000
324058099491,33cyclictest0-21swapper/012:10:280
3240582994835,7cyclictest0-21swapper/107:25:311
3240582994831,13cyclictest231ktimers/111:45:161
3240580994841,3cyclictest3276007-21tune2fs10:35:230
3240585994742,2cyclictest0-21swapper/208:35:252
324058599473,25cyclictest30-21rcuc/210:20:012
3240580994739,4cyclictest20750irq/251-8000000.ethernet09:05:240
324058599461,27cyclictest0-21swapper/212:30:012
3240585994534,7cyclictest0-21swapper/210:45:292
3240582994535,6cyclictest0-21swapper/108:30:001
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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