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2026-04-26 - 13:33

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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Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

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 100 highest latencies:
System rack5slot4s.osadl.org (updated Sun Apr 26, 2026 00:44:17)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3949149996556,7cyclictest4095951-21kworker/u8:2+flush-8:021:46:221
3949149996154,5cyclictest20850-21kworker/u8:2+events_unbound23:41:151
3949145996137,21cyclictest4051281-21diskstats20:51:100
3949149995851,5cyclictest3971318-21kworker/u8:0+flush-8:019:56:201
3949149995650,4cyclictest4103405-21kworker/u8:1+flush-8:023:11:201
3949149995650,4cyclictest4103405-21kworker/u8:1+flush-8:023:11:201
3949149995446,6cyclictest45368-21kworker/u8:0+flush-8:000:06:211
3949145995445,6cyclictest70131-21latency_hist00:25:010
3949149995347,4cyclictest4103405-21kworker/u8:1+events_unbound22:51:221
3949149995145,5cyclictest3971318-21kworker/u8:0+flush-8:020:21:201
3949149995143,6cyclictest4103405-21kworker/u8:1+flush-8:023:36:191
3949145995126,22cyclictest4021607-21diskstats20:21:090
3949153995045,4cyclictest4189318-21kworker/u8:3+flush-8:000:01:232
3949149995044,3cyclictest3971318-21kworker/u8:0+events_unbound20:06:081
3949149995041,7cyclictest4154764-21kworker/u8:0+flush-8:022:46:231
41011932490,5chrt0-21swapper/221:41:082
3949149994944,4cyclictest3954095-21kworker/u8:3+flush-8:021:36:211
3949149994943,4cyclictest4124979-21kworker/u8:3+events_unbound22:06:101
3949149994943,4cyclictest3954095-21kworker/u8:3+events_unbound20:26:121
3949149994940,6cyclictest3954095-21kworker/u8:3+flush-8:019:31:211
3949145994939,7cyclictest4125339-21latency_hist22:05:010
3949145994921,17cyclictest4090178-21unixbench_singl21:26:250
3949145994921,17cyclictest4090178-21unixbench_singl21:26:240
403642024841,4sleep30-21swapper/320:36:093
3949153994843,4cyclictest4154764-21kworker/u8:0+flush-8:023:01:232
3949145994831,15cyclictest45358-21basename00:00:000
3949149994742,3cyclictest4189318-21kworker/u8:3+events_unbound23:31:191
3949149994643,2cyclictest3971318-21kworker/u8:0+flush-8:020:01:191
3949149994640,5cyclictest69322-21kworker/u8:2+events_unbound00:26:121
3949149994640,4cyclictest4154764-21kworker/u8:0+flush-8:023:16:091
3949149994640,4cyclictest4154764-21kworker/u8:0+flush-8:023:16:091
3949149994640,4cyclictest3971318-21kworker/u8:0+flush-8:020:41:091
3949149994638,6cyclictest3954095-21kworker/u8:3+events_unbound19:21:201
3949145994637,7cyclictest4085568-21latency_hist21:25:010
3949145994633,10cyclictest3954061-21apt-get19:15:000
3949153994540,4cyclictest3971318-21kworker/u8:0+events_unbound19:46:182
3949149994540,4cyclictest3954095-21kworker/u8:3+flush-8:021:31:131
3949149994539,4cyclictest20850-21kworker/u8:2+events_unbound23:46:171
3949149994536,7cyclictest4154764-21kworker/u8:0+flush-8:023:21:181
3949145994513,22cyclictest0-21swapper/019:21:080
3949153994440,3cyclictest4189318-21kworker/u8:3+events_unbound00:30:012
3949149994438,4cyclictest4124979-21kworker/u8:3+events_unbound22:26:201
3949149994438,4cyclictest4103405-21kworker/u8:1+events_unbound22:01:161
3949149994438,4cyclictest3954095-21kworker/u8:3+flush-8:019:26:191
3949149994437,5cyclictest3971318-21kworker/u8:0+events_unbound19:51:181
3949145994427,15cyclictest3961180-21idleruntime-cro19:20:000
3949145994418,16cyclictest876-21mta-sts-daemon23:13:450
3949145994418,16cyclictest876-21mta-sts-daemon23:13:440
3949149994338,4cyclictest3954095-21kworker/u8:3+events_unbound21:21:191
3949149994336,6cyclictest4095951-21kworker/u8:2+flush-8:022:31:191
3949149994335,6cyclictest4031125-21kworker/u8:1+flush-8:021:16:191
3949145994325,15cyclictest3990483-21ntpq19:46:170
3949149994237,4cyclictest4031125-21kworker/u8:1+events_unbound21:06:181
3949149994236,5cyclictest3971318-21kworker/u8:0+events_unbound20:56:171
3949149994236,4cyclictest4031125-21kworker/u8:1+flush-8:021:01:141
3949149994235,5cyclictest69322-21kworker/u8:2+flush-8:000:36:241
3949149994234,6cyclictest4154764-21kworker/u8:0+flush-8:022:56:201
3949149994233,7cyclictest4144313-21ntpq22:21:181
394914599427,19cyclictest0-21swapper/021:16:080
3949145994213,18cyclictest0-21swapper/023:26:050
394869224228,9sleep10-21swapper/119:06:461
394869224228,9sleep10-21swapper/119:06:461
3949149994137,3cyclictest4103405-21kworker/u8:1+events_unbound22:16:141
3949149994135,4cyclictest4154764-21kworker/u8:0+flush-8:023:01:201
3949149994135,4cyclictest4031125-21kworker/u8:1+events_unbound20:51:221
3949149994134,5cyclictest4189318-21kworker/u8:3+flush-8:023:26:191
3949149994130,8cyclictest280-21systemd-journal20:19:361
3949149994127,10cyclictest45351-40logrotate00:00:001
394914599419,17cyclictest0-21swapper/021:36:090
41905372400,2sleep20-21swapper/223:11:132
41905372400,2sleep20-21swapper/223:11:132
3949149994036,3cyclictest3954095-21kworker/u8:3+flush-8:021:11:231
3949149994034,5cyclictest3971318-21kworker/u8:0+events_unbound20:46:171
394914599403,29cyclictest0-21swapper/000:06:060
3949145994031,7cyclictest4139298-21ntpq22:16:170
394914599399,18cyclictest4036160-21/usr/sbin/munin20:36:240
394914599394,28cyclictest0-21swapper/000:16:070
3949145993924,13cyclictest4021019-21sendmail20:20:000
3949153993834,3cyclictest3971318-21kworker/u8:0+events_unbound20:16:242
3949153993831,5cyclictest280-21systemd-journal19:20:002
3949149993834,2cyclictest4154764-21kworker/u8:0+events_unbound22:36:111
3949149993832,5cyclictest3954095-21kworker/u8:3+flush-8:020:11:211
3949149993832,4cyclictest3986755-21apt-get19:46:051
3949149993832,4cyclictest3954095-21kworker/u8:3+events_unbound20:36:211
3949149993831,5cyclictest4103405-21kworker/u8:1+events_unbound21:55:011
394914599388,18cyclictest589-21runrttasks22:49:390
3949145993822,14cyclictest3986377-21apt-key19:45:000
3949145993822,14cyclictest3986377-21apt-key19:45:000
3949149993733,3cyclictest3971318-21kworker/u8:0+events_unbound20:31:121
3949149993732,3cyclictest3944102-21kworker/u8:2+events_unbound19:11:181
3949149993731,4cyclictest49462-21ntpq00:01:171
394914599374,26cyclictest0-21swapper/023:41:040
3949145993714,21cyclictest4060826-21turbostat.cron21:00:000
3949149993630,5cyclictest4189318-21kworker/u8:3+flush-8:000:21:181
3949149993629,5cyclictest4031125-21kworker/u8:1+flush-8:021:26:101
3949149993629,5cyclictest4031125-21kworker/u8:1+flush-8:021:26:101
3949145993630,4cyclictest4103405-21kworker/u8:1+events_unbound22:21:050
394914599361,11cyclictest4109651-21ntpq21:46:160
3949149993529,5cyclictest4189318-21kworker/u8:3+flush-8:000:16:211
3949149993529,4cyclictest4103405-21kworker/u8:1+events_unbound00:31:111
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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