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2026-08-10 - 11:46
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Data to construct the above plot have been generated using the RT test utility cyclictest.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rackeslot6.osadl.org (updated Mon Aug 10, 2026 00:44:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
213470099149140,6cyclictest2219765-21apt-get23:30:031
213470099147134,10cyclictest2194834-21apt-get22:15:031
213470099140130,7cyclictest2213385-21latency_hist23:10:001
213469899140132,6cyclictest2195317-21kworker/u8:2+events_unbound23:05:020
213470099139131,5cyclictest2190039-21kworker/u8:1+events_unbound22:15:011
213469899139130,6cyclictest2195317-21kworker/u8:2+events_unbound22:40:030
2134700991341,128cyclictest1-21systemd00:00:011
213469899134123,8cyclictest2224801-21latency_hist23:45:010
213469899133126,4cyclictest2195317-21kworker/u8:2+events_unbound22:40:010
213469899132123,6cyclictest2226621-21kworker/u8:0+flush-179:023:54:590
213469899132121,8cyclictest2214949-21kworker/u8:0+events_unbound23:25:190
213469899131120,8cyclictest2186609-21latency_hist21:50:010
213469899129121,6cyclictest2162154-21apt-get20:33:340
213469899129117,9cyclictest2216570-21latency_hist23:20:010
213469899128121,5cyclictest2190039-21kworker/u8:1+events_unbound22:10:000
213470099127104,20cyclictest2146229-21apt-get19:45:111
213469899124119,4cyclictest2234435-21kworker/u8:3+events_unbound00:20:010
213469899124114,8cyclictest1213033-21systemd-journal00:04:000
21347009912398,22cyclictest2141193-21latency_hist19:30:011
213470099123110,9cyclictest2214949-21kworker/u8:0+flush-179:023:20:221
213470099122111,8cyclictest2139604-21latency_hist19:25:011
213469899122117,3cyclictest2165535-21kworker/u8:1+flush-179:021:00:240
213469899122115,5cyclictest2203030-21kworker/u8:0+flush-179:023:00:000
213470099121108,9cyclictest2177063-21latency_hist21:20:011
213469899121115,4cyclictest2135840-21kworker/u8:1+flush-179:019:15:180
21347009911893,22cyclictest2232811-21latency_hist00:10:011
21347009911893,22cyclictest2232811-21latency_hist00:10:011
213469899118111,5cyclictest2181278-21kworker/u8:1+events_unbound21:45:000
213469899118111,5cyclictest2141169-21kworker/u8:1+events_unbound19:35:260
213469899117110,4cyclictest2181278-21kworker/u8:1+flush-179:021:35:220
213469899117109,6cyclictest2165535-21kworker/u8:1+flush-179:020:45:030
213470299116107,6cyclictest2223222-21turbostat23:40:003
213470099116108,5cyclictest2201691-21/usr/sbin/munin22:35:231
213470099116105,7cyclictest2195317-21kworker/u8:2+flush-179:022:20:251
213469899116110,4cyclictest2214949-21kworker/u8:0+events_unbound23:20:240
213469899116108,6cyclictest2165535-21kworker/u8:1+flush-179:021:20:000
213470099115102,11cyclictest1213033-21systemd-journal19:55:011
213469899115108,5cyclictest2227947-21kworker/u8:1+flush-179:000:05:250
213469899115108,5cyclictest2227947-21kworker/u8:1+flush-179:000:05:250
213469899115101,5cyclictest2195317-21kworker/u8:2+flush-179:022:45:240
2134698991150,112cyclictest2223247-21true23:40:000
21346989911492,13cyclictest2190039-21kworker/u8:1+flush-179:022:00:230
213469899114103,8cyclictest2203030-21kworker/u8:0+flush-179:022:50:190
213470099113100,9cyclictest2172314-21kworker/u8:3+flush-179:021:10:251
213469899113105,6cyclictest2177667-21kworker/u8:0+events_unbound21:30:230
21347009911199,8cyclictest2177667-21kworker/u8:0+flush-179:021:30:261
21347009911198,9cyclictest2177667-21kworker/u8:0+flush-179:021:40:231
21347009911195,12cyclictest2234435-21kworker/u8:3+flush-179:000:25:251
213469899111104,5cyclictest2163774-21kworker/u8:0+flush-179:020:55:290
21347009910984,22cyclictest2170419-21latency_hist21:00:011
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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