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2026-07-18 - 17:41

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #f, 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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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
Compare latency of primary with shadow system
Characteristics of the 376 highest latencies:
System rackfslot4s.osadl.org (updated Sat Jul 18, 2026 12:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1647421250,2chrt16475-21seq11:14:260
602421210,3chrt6016-21ps11:46:500
120121210,2chrt1200-21sleep10:51:280
217221190,3chrt2081-21latency_hist12:30:050
1386721180,3chrt13868-21runrttasks09:32:420
1459421170,2chrt14593-21/usr/sbin/munin07:50:480
1169521170,2sleep011731-21aten2.4_rfpower11:55:330
2615921160,3chrt26160-21sh12:16:390
984621150,2chrt9847-21sleep10:15:460
1590221150,2chrt15903-21if_can008:45:400
502421130,2chrt5025-21chrt10:56:360
3234821120,1sleep032349-21chrt10:49:490
508021110,3sleep05081-21seq10:08:050
203121110,3chrt2032-21sleep11:41:080
808521100,1sleep08086-21chrt12:38:350
3215921100,2sleep032157-21aten2.4_rfpower10:00:330
999521090,3chrt9996-21gcc09:26:510
807421090,2chrt8072-21ssh09:24:310
355921090,2sleep03562-21ntp_kernel_pll_12:31:270
2130321080,2chrt21304-21runrttasks09:43:570
1216621080,2chrt12168-21sshd07:46:320
2107721070,3chrt21078-21seq11:21:050
707221060,2chrt7074-21cut10:11:060
232021040,2chrt2321-21sh08:23:530
982321030,2chrt9824-21sh07:43:370
86221020,2chrt863-21runrttasks11:39:390
185802960,2sleep018581-21ssh10:28:370
38642950,2sleep03865-21latency08:25:480
183162930,2sleep018320-21aten2.4_rfpower12:05:320
254902910,2sleep025491-21chrt10:39:190
156942900,2sleep015697-21cut12:01:070
285892870,2sleep028591-21chrt11:31:530
315042810,1sleep031506-21grep09:10:580
171412800,1sleep017143-21seq09:37:150
20856907816,53cyclictest26519-21ssh09:51:260
20856907815,47cyclictest22003-21ssh09:45:250
2085690776,55cyclictest8582-21df11:50:410
2085690766,58cyclictest29414-21ps09:56:040
194312750,1sleep019432-21seq08:50:510
30482740,2sleep03049-21ld09:16:250
23732740,3sleep02374-21ntp_kernel_pll_07:31:060
20856907417,47cyclictest28168-21fschecks_count09:05:350
20856907413,52cyclictest24879-21ps11:26:490
20856907412,53cyclictest27845-1kworker/0:2H08:35:330
2085690735,58cyclictest27223-21/usr/sbin/munin07:21:230
2085690735,56cyclictest13171-21diskstats10:20:430
2085690735,10cyclictest25849-21ntpq09:01:060
2085690734,58cyclictest8134-21sshd11:01:140
2085690734,11cyclictest21929-21diskstats08:55:360
20856907313,52cyclictest21913-21diskstats12:10:470
2085690727,54cyclictest10297-21apt-get11:05:160
2085690726,57cyclictest26464-21runrttasks10:40:470
2085690725,58cyclictest19797-21diskstats10:30:440
2085690725,57cyclictest30151-21apt-get07:25:530
2085690725,10cyclictest27158-21ntpq08:11:000
2085690724,59cyclictest29912-21runrttasks12:22:170
2085690724,47cyclictest12197-21seq08:40:030
2085690716,55cyclictest29503-21diskstats08:15:310
2085690715,57cyclictest18428-21ssh11:16:550
2085690715,56cyclictest5787-21python307:36:260
2085690715,55cyclictest6025-21apt-get08:30:210
2085690715,48cyclictest25870-21basename08:10:000
2085690705,55cyclictest17043-21sleep07:55:290
2085690704,9cyclictest22758-21latency_hist08:04:590
2085690695,10cyclictest24408-21df07:15:260
2085690684,44cyclictest22083-21ntpq07:10:590
2085690636,48cyclictest20911-21sort07:10:030
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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