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2026-05-26 - 03:46

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 Tue May 26, 2026 00:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
221339124300,3sleep12213393-21kthreadcore19:05:501
2215251997358,10cyclictest1704890-21systemd-journal23:10:471
2215249996748,16cyclictest2375553-21ntpq21:45:530
2215249996640,23cyclictest2232722-21diskstats19:25:450
2215251996457,4cyclictest2366826-21kworker/u8:3+events_unbound23:26:011
2215251996450,10cyclictest1704890-21systemd-journal22:30:471
2215251996450,10cyclictest1704890-21systemd-journal22:30:461
2215249996452,9cyclictest2251982-21apt-get19:45:000
2215249996339,21cyclictest2476333-21diskstats23:30:450
2215251996152,7cyclictest2297155-21kworker/u8:1+events_unbound20:31:131
2215251995850,6cyclictest2262175-21base6419:55:011
2215249995746,9cyclictest2454664-21ntpq23:05:540
2215251995650,4cyclictest2366826-21kworker/u8:3+events_unbound23:31:001
2215251995551,3cyclictest2158197-21kworker/u8:0+flush-8:019:45:451
2215251995447,5cyclictest2480548-21kworker/u8:2+events_unbound00:20:571
2215249995346,5cyclictest2540141-21apt-get00:31:360
2215251995242,8cyclictest2499735-21ntpq23:50:571
2215251995242,7cyclictest1704890-21systemd-journal22:20:471
2215249995235,15cyclictest2511112-21sshd00:05:470
2215249995235,15cyclictest2511112-21sshd00:05:470
2215249995227,22cyclictest2524366-21ntpq00:15:520
2215251995138,9cyclictest1704890-21systemd-journal20:55:471
2215251995046,3cyclictest2297155-21kworker/u8:1+flush-8:020:40:471
2215254994930,16cyclictest1704890-21systemd-journal21:25:012
2215251994944,4cyclictest2366826-21kworker/u8:3+flush-8:023:16:011
2215251994940,6cyclictest1704890-21systemd-journal21:00:471
2215249994930,16cyclictest2326769-21latency_hist21:00:010
24019112480,4sleep10-21swapper/122:15:471
2215251994843,4cyclictest2232193-21kworker/u8:3+flush-8:020:45:451
2215251994737,8cyclictest2286336-21ntpq20:15:531
2215249994723,9cyclictest2541230-21diskstats00:35:450
2215251994640,5cyclictest2158197-21kworker/u8:0+events_unbound21:50:491
2215251994637,6cyclictest2445719-21latency_hist23:00:011
2215249994626,17cyclictest2272797-21fschecks_time20:05:470
2215251994541,3cyclictest2183655-21kworker/u8:2+flush-8:020:06:001
2215251994539,4cyclictest2435863-21kworker/u8:0+events_unbound22:50:581
2215249994536,7cyclictest2465688-21latency_hist23:20:000
2215251994439,4cyclictest2480548-21kworker/u8:2+flush-8:023:56:001
2215251994438,4cyclictest2158197-21kworker/u8:0+events_unbound21:05:451
2215251994434,7cyclictest2391313-21latency_hist22:05:011
2215251994338,4cyclictest2232193-21kworker/u8:3+flush-8:020:35:461
2215251994337,4cyclictest2183655-21kworker/u8:2+events_unbound20:00:441
2215251994336,5cyclictest2366826-21kworker/u8:3+flush-8:023:40:561
2215249994332,8cyclictest2281162-21ntpq20:10:540
2215249994325,5cyclictest2470239-21unixbench_multi23:21:020
2215249994322,6cyclictest2471436-21fschecks_count23:25:460
2215251994236,5cyclictest2158197-21kworker/u8:0+flush-8:019:15:551
2215251994232,8cyclictest2251986-21latency_hist19:45:011
2215249994223,2cyclictest2220155-21apt-key19:15:000
2215251994134,5cyclictest2509623-21ntpq00:00:561
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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