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2026-10-20 - 03:01

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, slot #7

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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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.
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 rackcslot7s.osadl.org (updated Mon Oct 19, 2026 12:44:48)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
374958823300,5sleep00-21swapper/007:05:150
382943621150,4sleep342-21ksoftirqd/310:50:123
382403821020,2sleep20-21swapper/210:35:142
375038127741,13sleep20-21swapper/207:06:192
375047427538,14sleep10-21swapper/107:07:311
374918527447,17sleep30-21swapper/307:05:113
38073282590,3sleep23056-21PK-Backend09:45:222
38336082490,6sleep23832550-21/usr/sbin/munin11:00:222
38115282490,3sleep33056-21PK-Backend10:00:123
37621772430,4sleep33056-21PK-Backend07:40:003
375080799363,20cyclictest0-21swapper/111:03:371
375080799342,20cyclictest3793552-21taskset09:08:491
38468962330,2sleep10-21swapper/111:40:141
375080799331,20cyclictest3814443-21runrttasks10:06:381
38204422320,3sleep03056-21PK-Backend10:25:150
375080799323,17cyclictest3840694-21taskset11:21:321
375080799321,18cyclictest3849496-21taskset11:48:151
375080799320,19cyclictest3807665-21seq09:48:381
375080799312,18cyclictest0-21swapper/111:33:201
375080799312,16cyclictest3852948-21seq11:58:061
375080799311,17cyclictest3754600-21seq07:18:571
375080799310,18cyclictest3782447-21chrt08:36:251
375080799310,18cyclictest3782447-21chrt08:36:241
375080799301,15cyclictest3777351-21seq08:22:431
375080799290,2cyclictest3808635-21memory09:50:171
375080799280,16cyclictest37719702sleep108:05:251
37875062270,3sleep10-21swapper/108:50:201
3750807992711,14cyclictest3769018-21sed08:00:011
375080799269,15cyclictest3850328-21ls11:50:161
375080799262,22cyclictest3762108-21ls07:40:011
38563612250,8chrt34-21ksoftirqd/212:07:252
37818612250,3sleep20-21swapper/208:35:182
37818612250,3sleep20-21swapper/208:35:172
375080799259,14cyclictest3845702-21sed11:35:211
375080799254,19cyclictest3774991-21tr08:15:171
375080799253,20cyclictest3815463-21uname10:10:161
375080799251,22cyclictest3765864-21tr07:50:131
3750807992511,13cyclictest3855973-21python312:05:211
38414032240,4sleep03841408-21cpuspeed_turbos11:25:130
38414032240,4sleep03841408-21cpuspeed_turbos11:25:130
375080799248,14cyclictest3774224-21date08:15:011
3750807992413,10cyclictest3837911-21tr11:15:111
3750809992321,1cyclictest0-21swapper/212:13:462
375080799236,15cyclictest3796023-21df09:15:141
375080799236,15cyclictest3784744-21cut08:45:001
375080799231,20cyclictest3860288-21/usr/sbin/munin12:20:251
3750807992311,10cyclictest3857009-21tr12:10:111
3750802992320,2cyclictest3056-21PK-Backend12:34:510
3750802992314,7cyclictest883-21dbus-daemon08:29:590
37609092220,5sleep00-21swapper/007:35:170
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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