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2026-06-22 - 01:25

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, 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: 50 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 rack4slot6s.osadl.org (updated Sun Jun 21, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1349922460,3sleep013496-21find12:30:250
1759821320,4chrt17596-21ntp_states08:35:220
26598212918,26sleep026645-21if_eth007:05:140
1202821280,4sleep012030-21latency_hist08:15:000
27729991258,18cyclictest32698-21df11:40:100
27729991217,16cyclictest23926-21irqstats09:00:180
2999221200,2sleep029991-21latency_hist11:30:010
294721190,3chrt2945-21memory11:50:180
27729991199,17cyclictest276-21runrttasks07:31:460
27729991189,15cyclictest9649-21/usr/sbin/munin12:15:260
277299911711,16cyclictest32754-21cat09:35:020
2923121160,3chrt29232-21if_eth007:15:160
27729991169,14cyclictest18905-21ntp_states08:40:220
27729991159,17cyclictest24518-21seq11:08:020
27729991159,16cyclictest5634-21ntp_states12:00:220
27729991159,15cyclictest18774-21/usr/sbin/munin10:45:260
27729991158,15cyclictest4406-21/usr/sbin/munin07:45:100
27729991158,14cyclictest6285-21uptime07:50:300
27729991157,18cyclictest18316-21latency_hist10:45:020
27729991157,14cyclictest12078-21/usr/sbin/munin10:20:140
277299911512,89cyclictest13316-21latency_hist08:20:020
277299911510,15cyclictest32003-21ntp_states07:25:210
27729991149,17cyclictest10525-21/usr/sbin/munin12:20:140
27729991149,16cyclictest7736-21chrt10:02:580
27729991149,16cyclictest30715-21ntp_states07:20:220
27729991148,17cyclictest12400-21users12:25:290
27729991147,15cyclictest20939-21seq08:49:050
277299911410,16cyclictest31627-21ntp_states11:35:220
277299911410,15cyclictest15324-21runrttasks12:38:220
27729991139,17cyclictest350-21grep09:35:100
27729991138,16cyclictest1717-21/usr/sbin/munin11:45:180
27729991138,15cyclictest6258-21seq09:56:380
27729991137,18cyclictest27489-21/usr/sbin/munin11:20:190
27729991137,14cyclictest15158-21users10:30:300
277299911327,74cyclictest13649-21/usr/sbin/munin08:20:180
277299911310,17cyclictest22503-21memory11:00:180
27729991129,16cyclictest4087-21/usr/sbin/munin11:55:100
27729991129,15cyclictest14929-21memory08:25:180
27729991128,16cyclictest30047-21chrt09:24:260
27729991127,15cyclictest16034-21/usr/sbin/munin10:35:170
27729991127,14cyclictest4168-21sed09:50:020
27729991119,16cyclictest8946-21chrt10:07:220
27729991119,14cyclictest26652-21ntp_states09:10:220
27729991118,14cyclictest25070-21/usr/sbin/munin09:05:180
27729991117,16cyclictest9860-21ntp_states08:05:220
27729991117,15cyclictest20981-21latency_hist10:55:020
27729991117,14cyclictest14503-21cat10:30:010
27729991117,13cyclictest27692-21/usr/sbin/munin09:15:100
277299911127,73cyclictest21303-21runrttasks10:55:240
27729991108,15cyclictest27889-21df_inode07:10:140
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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