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2026-04-23 - 02:52

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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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 50 highest latencies:
System rackeslot6s.osadl.org (updated Wed Apr 22, 2026 12:44:48)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
15451699541,44cyclictest30-21rcuc/209:05:012
15451699541,36cyclictest0-21swapper/209:20:012
154514995410,28cyclictest22-21rcuc/107:45:011
154514995410,28cyclictest22-21rcuc/107:45:011
154512995414,3cyclictest180952-21memory09:40:240
154512995243,5cyclictest167350irq/118-8000000.ethernet-tx010:50:160
15451699516,11cyclictest191424-21apt-get10:45:022
154512995144,4cyclictest184690-21latency_hist10:05:010
154512995144,4cyclictest167350irq/118-8000000.ethernet-tx007:20:180
154512995143,4cyclictest167350irq/118-8000000.ethernet-tx008:45:240
154512995119,5cyclictest205727-21/usr/sbin/munin12:05:260
154514995042,5cyclictest190582-21munin-plugin-st10:40:001
154512995043,4cyclictest194038-21munin-plugin-st11:00:000
154512995042,4cyclictest167350irq/118-8000000.ethernet-tx008:00:290
154514994937,9cyclictest177056-21run-parts09:20:001
15451299497,39cyclictest208790-21sh12:25:190
15451499488,12cyclictest14-21rcu_preempt12:20:001
154514994836,8cyclictest0-21swapper/110:20:011
15451499482,20cyclictest22-21rcuc/111:20:011
154512994837,6cyclictest0-21swapper/009:20:250
154512994830,15cyclictest167350irq/118-8000000.ethernet-tx008:55:180
15451299482,44cyclictest0-21swapper/012:10:250
15451299482,44cyclictest0-21swapper/012:10:250
15451299482,22cyclictest0-21swapper/007:15:010
15451499472,15cyclictest0-21swapper/111:35:011
15451499472,15cyclictest0-21swapper/111:35:011
154512994740,5cyclictest170214-21munin-plugin-st08:40:000
154512994740,4cyclictest167350irq/118-8000000.ethernet-tx010:35:280
154512994735,8cyclictest156654-21grep07:20:010
154516994633,7cyclictest0-21swapper/207:15:012
154516994632,9cyclictest0-21swapper/207:40:272
154516994632,9cyclictest0-21swapper/207:40:262
15451299465,8cyclictest0-21swapper/009:05:010
154516994532,8cyclictest0-21swapper/211:25:282
154516994530,7cyclictest0-21swapper/210:20:202
154514994534,8cyclictest194037-21run-parts11:00:001
154514994531,9cyclictest0-21swapper/109:45:001
154512994538,4cyclictest167350irq/118-8000000.ethernet-tx009:50:230
154512994536,4cyclictest202572-21munin-plugin-st11:50:000
15451299452,5cyclictest196071-21df11:10:150
154512994523,19cyclictest20650irq/252-8000000.ethernet09:10:240
154512994517,3cyclictest186610-21df10:15:160
154516994438,4cyclictest311ktimers/210:15:112
154516994434,4cyclictest0-21swapper/211:05:012
154514994430,8cyclictest0-21swapper/110:10:261
154514994417,17cyclictest231ktimers/111:20:111
154512994438,3cyclictest167350irq/118-8000000.ethernet-tx008:40:170
154512994437,4cyclictest167350irq/118-8000000.ethernet-tx010:25:270
15451699433,22cyclictest0-21swapper/211:15:012
154516994327,12cyclictest0-21swapper/210:15:012
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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