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2026-07-17 - 13:16

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 100 highest latencies:
System rackfslot4s.osadl.org (updated Fri Jul 17, 2026 00:44:35)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3159321330,2sleep031594-21cat22:10:370
740121250,2chrt7307-21apt-get00:00:270
2768621190,2chrt27687-21sleep20:25:170
2721221190,2chrt27202-21df_inode21:15:470
1687321190,3chrt16875-21fschecks_count23:25:520
1194521180,2chrt11929-21ntpq00:06:320
810821170,3chrt8110-21sleep23:12:150
2085821170,2sleep020857-21sed23:31:200
1154821160,3chrt11539-21ssh22:29:160
2351821150,2chrt23519-21sleep22:46:450
1811021140,2chrt18111-21sleep00:16:200
2962821130,1sleep029630-21cut22:56:070
2097721130,4chrt20970-21ps21:05:440
939821120,2sleep09399-21ssh21:37:010
2696021120,2chrt26958-21/usr/sbin/munin23:40:540
463421100,4chrt4635-21sleep23:55:590
3268121100,2sleep032682-21chrt21:23:390
496921090,2sleep04971-21entropy21:30:490
476221090,2sleep04763-21tail20:40:250
100821090,3chrt1009-21sleep23:01:430
2164121080,2chrt21642-21awk20:15:270
2063821070,1sleep020639-21chrt22:42:210
2249821060,2chrt22499-21awk00:22:170
2511721010,2chrt25118-21sleep19:28:190
236932970,2sleep023694-21hostname21:10:350
272222910,2sleep027223-21chrt22:04:150
21692870,1sleep02170-21mii-tool21:26:420
34542840,2sleep03455-21hostname23:05:530
260662840,2sleep026067-21seq22:51:000
307152820,2sleep030716-21sed23:46:070
317382810,3chrt31731-21ps00:36:070
122882800,2sleep012289-21chrt21:41:150
290552760,2sleep029056-21chrt19:35:180
60652750,2sleep06066-21chrt22:20:540
219992710,3sleep022002-21sed21:56:070
13349907138,23cyclictest17257-21ssh21:49:160
13349907036,14cyclictest16761-21ntpq22:36:370
13349907034,14cyclictest28823-21cron19:35:000
119942700,2sleep011998-21irqrtprio20:51:350
145172690,2sleep014518-21seq22:33:260
13349906936,13cyclictest28939-21ntpq00:31:380
13349906935,15cyclictest11351-21ntpq23:17:100
13349906843,16cyclictest24164-21apt-get00:25:260
197202670,2sleep019722-21cat21:52:210
13349906733,14cyclictest17574-21memory19:15:520
13349906635,22cyclictest13927-21/usr/sbin/munin00:10:340
13349906635,12cyclictest3962-21seq22:17:200
13349906634,22cyclictest5880-21/usr/sbin/munin19:50:400
13349906633,22cyclictest1719-21df20:35:270
13349906633,21cyclictest15216-21/usr/sbin/munin20:05:350
13349906632,15cyclictest27553-21apt-get22:06:410
13349906631,24cyclictest22959-21/usr/sbin/munin23:36:120
13349906543,14cyclictest14693-21if_eth120:55:420
13349906533,13cyclictest13467-21chrt23:20:430
13349906531,13cyclictest19152-21sleep21:02:250
13349906440,16cyclictest1171-21/usr/sbin/munin23:50:510
13349906433,23cyclictest14505-21sed19:10:500
13349906433,21cyclictest2794-21/usr/sbin/munin19:45:430
13349906433,21cyclictest12636-21hddtemp_smartct20:00:380
13349906432,23cyclictest31266-21perl20:30:370
13349906432,22cyclictest8917-21ntp_states20:46:170
13349906339,15cyclictest25441-21irqstats20:20:470
13349906332,22cyclictest863-21ntpq19:41:040
13349906331,23cyclictest9861-21irqstats19:55:440
13349906232,21cyclictest18823-21seq20:10:360
13349906132,21cyclictest20025-21/usr/sbin/munin19:20:240
13349905737,13cyclictest13380-21latency_hist19:10:030
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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