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2026-09-08 - 21:38

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, slot #5

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 20 highest latencies:
System rack3slot5s.osadl.org (updated Tue Sep 08, 2026 12:43:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1211180ksoftirqd/1121750irq/30-eth0_g0_07:40:591
121890ksoftirqd/1121750irq/30-eth0_g0_09:36:041
121890ksoftirqd/1121750irq/30-eth0_g0_09:36:041
121860ksoftirqd/1121650irq/29-eth0_g0_12:32:280
121800ksoftirqd/1121750irq/30-eth0_g0_11:55:540
121800ksoftirqd/1121750irq/30-eth0_g0_11:55:540
121770ksoftirqd/1121750irq/30-eth0_g0_11:39:381
103792740chrt121650irq/29-eth0_g0_11:20:210
109622630chrt121750irq/30-eth0_g0_09:10:401
137842620sleep1121650irq/29-eth0_g0_11:32:101
258722610sleep1121750irq/30-eth0_g0_12:21:021
222452610sleep1121750irq/30-eth0_g0_09:55:521
169152560sleep1121750irq/30-eth0_g0_07:20:571
121500ksoftirqd/1121650irq/29-eth0_g0_08:31:030
121750490irq/30-eth0_g0_1219-21kworker/1:211:16:151
121490ksoftirqd/1121750irq/30-eth0_g0_12:06:511
121490ksoftirqd/1121750irq/30-eth0_g0_11:21:570
267562480sleep1121650irq/29-eth0_g0_10:14:031
121480ksoftirqd/1121650irq/29-eth0_g0_10:11:320
121460ksoftirqd/1121750irq/30-eth0_g0_11:00:471
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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