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2026-08-28 - 22:42

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #4

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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  Intel
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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, lowest P state: ondemand
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack5slot4s.osadl.org (updated Fri Aug 28, 2026 12:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
382246599205180,22cyclictest4063446-21python311:07:480
382247099177173,2cyclictest0-21swapper/111:07:471
382247199176171,3cyclictest4063447-21sshd11:07:482
387206921320,4sleep3481ktimers/307:57:393
41306782630,6sleep20-21swapper/212:17:382
39431902560,6sleep3451irq_work/309:07:423
3822465994841,5cyclictest275-21systemd-journal09:32:480
3822470994738,7cyclictest3864548-21apt-get07:50:371
3822465994739,5cyclictest4113576-21latency_hist12:00:000
3822465994739,5cyclictest4113576-21latency_hist12:00:000
3822471994637,7cyclictest4053907-21cp11:00:002
3822465994615,18cyclictest573-21runrttasks07:57:310
3822465994434,8cyclictest3989254-21/usr/sbin/munin09:57:480
3822465994333,8cyclictest275-21systemd-journal12:33:480
3822465994233,7cyclictest4053790-21latency_hist11:00:010
382219624228,9sleep10-21swapper/107:08:461
3822465994132,6cyclictest275-21systemd-journal07:36:370
3822465994115,11cyclictest3889675-21apt-get08:17:320
3822470994033,5cyclictest275-21systemd-journal10:01:481
3822470994032,6cyclictest275-21systemd-journal11:38:471
39744812390,2sleep3575-21kworker/3:2+mm_percpu_wq09:42:293
3822470993931,6cyclictest3874180-21latency_hist08:00:001
3822465993935,3cyclictest3475338-21kworker/u8:4+events_unbound07:12:370
40009142380,1sleep1281rcuc/110:07:391
382247199389,14cyclictest3864750-21apt-get07:52:322
3822465993818,16cyclictest3833542-21ntpq07:17:420
3822465993816,10cyclictest3888471-21ntpq08:12:440
3822465993813,14cyclictest3908387-21/usr/sbin/munin08:32:480
382247199374,21cyclictest4114339-21tune2fs12:02:352
382247199374,21cyclictest4114339-21tune2fs12:02:352
3822465993723,9cyclictest3859748-21apt-get07:47:310
3822465993714,9cyclictest3958807-21/usr/sbin/munin09:22:500
3822465993711,16cyclictest4033440-21runrttasks10:37:470
382247199368,14cyclictest3879829-21apt-get08:07:322
3822465993615,6cyclictest4137767-21/usr/sbin/munin12:22:490
3822465993614,5cyclictest4127672-21ntpq12:12:440
3822465993614,10cyclictest3918215-21ntpq08:42:460
3822465993613,8cyclictest4073171-21/usr/sbin/munin11:17:470
3822465993613,6cyclictest3858646-21ntpq07:42:460
3822465993613,11cyclictest3868512-21ntpq07:52:440
3822465993612,8cyclictest573-21runrttasks10:12:310
3822465993612,14cyclictest0-21swapper/008:23:560
3822465993612,14cyclictest0-21swapper/008:23:560
3822471993527,6cyclictest3874304-21gpgv08:00:002
3822465993523,8cyclictest4128814-21apt-get12:17:290
3822465993515,8cyclictest3984832-21/usr/sbin/munin09:52:370
3822465993514,8cyclictest4068121-21ntpq11:12:450
3822465993514,7cyclictest3945020-21/usr/sbin/munin09:12:350
3822465993513,9cyclictest4048107-21ntpq10:52:430
3822465993513,8cyclictest3949537-21sshd09:15:480
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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