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2026-05-20 - 00:20

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 19, 2026 12:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
13285992650,2sleep3471rcuc/307:20:573
13514872630,5sleep30-21swapper/307:45:483
1314034995732,22cyclictest1404693-21ntpq08:36:000
1314039995242,7cyclictest1539548-21latency_hist10:55:011
1314042995141,7cyclictest1704890-21systemd-journal11:00:002
1314039995143,6cyclictest1345799-21kworker/u8:2+events_unbound10:56:031
1314034994838,7cyclictest1390713-21latency_hist08:25:010
1314039994738,7cyclictest1627631-21ntpq12:20:591
1314034994740,5cyclictest1335728-21kworker/u8:0+flush-8:009:31:020
1314039994641,4cyclictest1335728-21kworker/u8:0+events_unbound10:16:021
1314039994536,6cyclictest1370910-21latency_hist08:05:011
1314039994435,6cyclictest1564241-21latency_hist11:20:001
1314034994434,8cyclictest1548542-21ntpq11:01:010
1314034994420,21cyclictest1379912-21ntpq08:10:590
1314034994420,21cyclictest1379912-21ntpq08:10:580
1314039994338,3cyclictest1465426-21kworker/u8:1+flush-8:010:21:051
1314039994337,5cyclictest1335728-21kworker/u8:0+flush-8:010:11:011
1314034994335,5cyclictest1529672-21latency_hist10:45:010
131403499431,27cyclictest1425292-21sshd08:56:330
1314034994234,6cyclictest1579390-21/usr/sbin/munin11:35:580
1314034994234,6cyclictest1579113-21latency_hist11:35:000
1314034994232,8cyclictest1444493-21ntpq09:16:010
1314034994221,17cyclictest0-21swapper/010:30:030
1314034994220,19cyclictest1524696-21latency_hist10:40:010
1314042994134,5cyclictest1514995-21base6410:30:012
1314039994132,7cyclictest1429742-21ntpq09:01:051
1314039994132,7cyclictest1414909-21ntpq08:46:021
131403499415,26cyclictest0-21swapper/011:53:390
1314034994119,20cyclictest1484532-21grep09:56:060
1314039994035,3cyclictest459996-21kworker/u8:3+flush-8:007:16:031
1314039994035,3cyclictest1345799-21kworker/u8:2+flush-8:008:36:041
1314039994033,5cyclictest1335728-21kworker/u8:0+flush-8:007:56:061
1314039994033,5cyclictest1313887-21kworker/u8:1+events_unbound07:51:041
1314039994030,8cyclictest1593027-21ntpq11:46:001
1314034994010,21cyclictest0-21swapper/009:24:120
1314042993931,5cyclictest1485124-21cat10:00:012
1314039993933,4cyclictest1335728-21kworker/u8:0+flush-8:009:11:061
1314039993932,5cyclictest1385958-21kworker/u8:1+flush-8:008:51:011
1314034993921,16cyclictest1504301-21unixbench_multi10:16:050
131403499391,24cyclictest401-21dbus-daemon11:10:010
1314042993833,4cyclictest1313887-21kworker/u8:1+flush-8:008:06:042
1314042993831,5cyclictest1335728-21kworker/u8:0+flush-8:007:41:022
1314039993832,4cyclictest1465426-21kworker/u8:1+flush-8:010:40:531
1314039993831,5cyclictest1465426-21kworker/u8:1+events_unbound10:06:031
131403499388,21cyclictest0-21swapper/008:47:160
1314034993825,10cyclictest1704890-21systemd-journal10:29:590
1314042993729,6cyclictest1415710-21cat08:50:002
1314039993733,3cyclictest1335728-21kworker/u8:0+events_unbound07:40:011
1314039993731,4cyclictest459996-21kworker/u8:3+flush-8:007:10:541
1314034993727,8cyclictest1622718-21ntpq12:16:020
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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