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2026-01-09 - 05:45

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, slot #3

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.
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 100 highest latencies:
System rack3slot3s.osadl.org (updated Fri Jan 09, 2026 00:43:56)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1719401212754,68sleep30-21swapper/319:07:353
17146782118104,9sleep20-21swapper/219:05:102
171957128855,10sleep10-21swapper/119:09:461
171942327758,13sleep00-21swapper/019:07:520
1719710992421,1cyclictest0-21swapper/323:55:123
171971099241,10cyclictest2049685-21chrt00:17:043
1719710992320,1cyclictest0-21swapper/322:30:553
1719710992320,1cyclictest0-21swapper/322:30:553
20178782221,9sleep02018213-21latency_hist23:50:010
1719710992219,1cyclictest0-21swapper/321:00:213
1719710992110,8cyclictest1774466-21chrt19:57:123
1719710992017,1cyclictest0-21swapper/321:55:233
1719710992017,1cyclictest0-21swapper/320:10:003
1719710992017,1cyclictest0-21swapper/300:05:213
1719710992016,2cyclictest0-21swapper/322:45:003
20661752191,5sleep12066190-21cpu00:35:111
20661752191,5sleep12066190-21cpu00:35:111
19655112191,2sleep00-21swapper/023:00:110
1719710991916,1cyclictest0-21swapper/321:20:213
1719710991916,1cyclictest0-21swapper/321:00:013
171971099191,5cyclictest2001918-21turbostat23:35:003
1719710991915,2cyclictest0-21swapper/323:50:013
1719710991915,2cyclictest0-21swapper/321:45:123
171971099191,15cyclictest2012364-21turbostat23:44:593
171971099182,11cyclictest1943080-21taskset22:35:203
1719710991815,1cyclictest0-21swapper/321:05:173
1719710991815,1cyclictest0-21swapper/320:10:253
1719710991814,2cyclictest0-21swapper/321:15:153
171971099181,13cyclictest0-21swapper/320:30:113
171971099181,13cyclictest0-21swapper/319:15:123
171971099181,13cyclictest0-21swapper/300:00:113
171971099181,10cyclictest1826000-21taskset20:45:183
17951532171,11sleep11795262-21processes20:15:231
171971099177,6cyclictest1985847-21taskset23:16:043
171971099177,6cyclictest1822283-21taskset20:44:053
171971099172,10cyclictest2018430-21taskset23:50:113
171971099172,10cyclictest1881838-21taskset21:40:133
1719710991714,1cyclictest0-21swapper/323:10:133
1719710991714,1cyclictest0-21swapper/300:35:253
1719710991714,1cyclictest0-21swapper/300:35:243
1719710991713,2cyclictest0-21swapper/323:30:003
1719710991713,2cyclictest0-21swapper/322:00:163
171971099171,13cyclictest0-21swapper/319:25:203
171971099171,12cyclictest2044670-21turbostat00:15:013
171971099171,12cyclictest1876105-21chrt21:35:123
171971099170,14cyclictest0-21swapper/323:20:243
17373012161,2sleep10-21swapper/119:25:011
171971099168,5cyclictest1747804-21turbostat19:34:593
171971099162,9cyclictest2002169-21taskset23:35:123
171971099162,9cyclictest2002169-21taskset23:35:123
171971099161,9cyclictest1896601-21taskset21:52:513
171971099161,9cyclictest1719882-21taskset19:10:063
1719710991613,1cyclictest0-21swapper/323:05:273
1719710991613,1cyclictest0-21swapper/321:32:083
1719710991612,2cyclictest0-21swapper/322:20:173
1719710991612,2cyclictest0-21swapper/319:45:143
1719710991612,2cyclictest0-21swapper/300:20:103
171971099161,12cyclictest1954797-21turbostat22:50:003
171971099161,12cyclictest0-21swapper/322:05:113
171971099161,12cyclictest0-21swapper/320:35:113
171971099160,13cyclictest0-21swapper/319:40:203
171971099160,12cyclictest0-21swapper/320:00:093
171971099160,10cyclictest2065849-21taskset00:34:163
171971099160,10cyclictest1801021-21taskset20:21:013
171971099160,10cyclictest1752625-21taskset19:35:243
171971099157,1cyclictest0-21swapper/323:00:173
171971099151,9cyclictest2055429-21taskset00:25:063
171971099151,9cyclictest1964062-21taskset22:55:163
171971099151,9cyclictest1917396-21taskset22:10:303
1719710991513,1cyclictest0-21swapper/321:10:023
171971099151,11cyclictest1796084-21sleep20:19:593
171971099151,10cyclictest1918034-21taskset22:15:123
171971099151,10cyclictest1828162-21chrt20:50:113
171971099150,13cyclictest0-21swapper/322:50:173
171971099150,12cyclictest0-21swapper/322:25:213
19380672140,2sleep10-21swapper/122:30:261
19380672140,2sleep10-21swapper/122:30:251
18711242141,9sleep11870836-21/usr/sbin/munin21:30:131
171971099141,9cyclictest1732724-21chrt19:20:123
171971099141,8cyclictest1764399-21taskset19:50:073
1719710991411,1cyclictest0-21swapper/321:25:123
171971099140,9cyclictest18015962sleep320:25:113
171971099140,9cyclictest18015962sleep320:25:113
20594642131,7sleep12055435-21/usr/sbin/munin00:25:211
20123532131,8sleep12012765-21latency_hist23:45:011
19290542131,2sleep00-21swapper/022:25:150
19182872131,8sleep01918311-21awk22:15:140
18074212131,8sleep01808391-21cut20:30:170
17364062131,8sleep21736495-21proc_pri19:20:212
19707212121,6sleep01970739-21apt-get23:05:110
19608062121,7sleep01960943-21kthreadcore22:55:140
19013592121,7sleep01901604-21/usr/sbin/munin21:55:260
18447812121,7sleep01845320-21cut21:05:160
18392052121,7sleep01839272-21kernelversion21:00:150
17523172121,7sleep21752372-21ld19:35:202
20502852111,5sleep12050488-21diskstats00:20:121
20499182111,4sleep12049949-21munin-run00:19:591
20405702111,6sleep12042233-21kthreadcore00:10:181
20346432111,5sleep12034767-21perl00:05:131
20131632111,5sleep12013208-21grep23:45:131
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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