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2026-08-24 - 16:10

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 all highest latencies:
System rackfslot4s.osadl.org (updated Mon Aug 24, 2026 12:44:35)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1019121330,3chrt10192-21sleep12:36:530
418121230,2sleep04182-21cat12:28:010
3236021230,3chrt32340-21ntpq12:21:260
2616521220,3chrt26167-21fschecks_count10:35:500
640621210,3chrt6405-21/usr/sbin/munin09:17:170
2814521210,2chrt28147-21sh11:26:440
953621180,3chrt9537-21runrttasks11:47:240
701421170,2sleep07015-21chrt07:35:220
2930221160,2chrt29301-21seq12:17:090
1418021160,3chrt14181-21if_eth011:06:030
2584521150,3chrt25846-21runrttasks12:12:000
90221140,3chrt903-21sleep11:35:200
334821140,3chrt2284-21apt-get08:21:050
3259521130,2sleep032596-21grep10:45:360
2402221120,3chrt24023-21sleep08:01:280
2702621110,3chrt27027-21runrttasks07:15:200
1178121100,2chrt11779-21/usr/sbin/munin11:51:260
902421070,2sleep09025-21tail08:30:240
3226921050,2chrt32270-21sleep09:06:290
1886821040,2chrt18869-21sleep12:01:220
2946021030,3chrt29461-21sleep09:02:130
86102990,3sleep08611-21seq10:09:280
158282960,2sleep015832-21irqrtprio08:40:430
85302940,2sleep08531-21seq08:29:320
269452930,2sleep026946-21sh09:47:510
259922880,2sleep025993-21chrt11:23:480
105412870,2sleep010542-21grep07:40:330
241832860,2chrt23459-21apt-get07:11:040
256722830,2sleep025673-21seq08:05:230
313472820,2sleep031349-21munin-plugin-st09:55:000
213852790,2sleep021386-21chrt08:50:240
162262790,1sleep016227-21collect209:31:540
14002790,2sleep01401-21chrt09:10:250
155612730,1sleep015562-21cut10:20:040
16852700,1sleep01686-21seq09:58:480
290482690,3sleep029049-21seq08:10:300
40182670,1sleep04020-21cut07:30:220
105362670,1sleep010537-21hostname11:00:550
309852650,1sleep030986-21irqrtprio11:31:060
23002650,2sleep02302-21chrt08:20:010
185672640,2sleep018569-21cut09:35:500
231862600,2sleep023189-21tr11:20:010
107922600,2sleep010794-21processes10:12:130
40062580,2sleep04007-21chrt10:01:590
75732560,2sleep07572-21sed10:56:050
196422540,2sleep019643-21smartctl10:25:560
23519905219,24cyclictest0-21swapper09:29:400
23519905219,23cyclictest3131-21/usr/sbin/munin10:51:010
23519905118,24cyclictest0-21swapper10:34:410
135092510,1sleep013510-21chrt07:45:290
23519905018,23cyclictest5510-21ntpq11:41:310
23519904921,20cyclictest30536-21ntpq10:41:590
23519904829,13cyclictest22510-21kernelversion09:41:160
23519904816,24cyclictest17351-21ntpq10:22:090
23519904816,23cyclictest18330-21ntp_states11:12:110
23519904816,22cyclictest12352-21diskstats08:35:330
23519904815,12cyclictest22455-21ntp_states12:06:540
23519904725,13cyclictest15073-21/usr/sbin/munin11:56:030
23519904717,22cyclictest8433-21df09:20:400
23519904716,20cyclictest25446-21ntpq08:55:530
23519904716,13cyclictest16592-21runrttasks07:50:260
23519904617,20cyclictest0-21swapper12:30:090
23519904524,13cyclictest19428-21chrt07:55:200
23519904521,14cyclictest755-21apt-get07:25:230
2140724511,19sleep021449-21ntpq07:05:360
23519904425,12cyclictest31249-21runrttasks07:21:030
23519904414,21cyclictest18536-21df08:45:280
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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