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2026-03-20 - 01:01

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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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 Thu Mar 19, 2026 12:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2864721190,2chrt28648-21runrttasks10:58:440
2802621190,3chrt28025-21/usr/sbin/munin07:36:270
1400921170,4chrt14006-21ld09:47:560
1401521150,3chrt14013-21ld08:06:000
1386921150,2sleep013870-21latency10:36:100
924721140,2chrt9248-21sh09:41:020
691921140,3chrt6920-21sleep12:03:200
670521140,1sleep06768-21cut08:46:240
834421130,2sleep08345-21chrt09:40:020
3210821130,3chrt32109-21seq11:04:020
2998421130,1sleep029985-21seq11:49:430
2191521130,2chrt21910-21ps11:37:120
1960121130,1sleep019602-21run-parts12:22:120
1369021130,3chrt13691-21ssh12:13:370
493921100,3chrt4938-21seq08:44:360
2382621100,2chrt23823-21tune2fs07:30:330
102621100,2chrt1027-21seq09:28:400
2540421080,2chrt25408-21chrt12:31:030
1982621080,3chrt19827-21runrttasks11:34:390
1311021080,4chrt13111-21sleep07:12:580
1182721080,3chrt11828-21sh08:55:300
2078121070,2chrt20782-21runrttasks10:46:320
1797121070,2chrt17972-21runrttasks10:42:160
1615721070,2chrt16158-21runrttasks12:17:090
3059921060,2chrt30600-21ssh09:24:440
1290621060,3chrt12907-21runrttasks11:23:560
2996621040,2chrt29964-21entropy07:40:340
2570621040,1sleep025707-21runrttasks10:54:390
129121030,2chrt1292-21sleep08:38:060
123312930,2sleep012332-21seq10:34:260
177892920,2sleep017790-21chrt09:53:270
6852900,2sleep0687-21grep07:45:350
69072890,2sleep06912-21sleep07:55:340
256712890,1sleep025672-21seq11:42:410
10782860,2sleep01079-21date11:55:050
87592839,20sleep08761-21ntpq07:05:390
274422830,2sleep027444-21sed09:20:040
212032770,1sleep021204-21seq09:58:410
104732770,2sleep010471-21hddtemp_smartct08:01:060
224482730,2sleep022449-21seq07:28:000
255392720,2sleep025541-21cut10:05:340
222042720,1sleep022205-21/usr/sbin/munin12:26:090
184152720,2sleep018406-21ntp_states07:21:110
278172710,2sleep027819-21sh12:35:200
34992700,2sleep03500-21seq11:58:060
10832600,2sleep01088-21tr11:06:030
10794905625,16cyclictest22397-21df10:00:410
31522550,1sleep03151-21ld09:31:330
185262530,1sleep018529-21cut09:05:450
10794905320,13cyclictest10036-21munin-run11:20:030
10794905124,19cyclictest21296-21ssh09:10:490
10794905118,13cyclictest4302-21memory07:50:480
10794905021,20cyclictest0-21swapper10:23:550
10794905020,21cyclictest6770-21fw_packets10:25:550
10794905019,22cyclictest4913-21ssh11:11:340
10794905019,22cyclictest14949-21sleep11:26:360
10794904919,20cyclictest16953-21memory08:10:470
10794904917,23cyclictest7315-21runrttasks10:16:480
10794904916,13cyclictest26609-21ntp_states08:26:160
10794904816,12cyclictest8398-21perl12:05:490
10794904814,13cyclictest29016-21df10:10:380
10794904722,15cyclictest14612-21apt-get09:00:150
10794904717,22cyclictest28410-21apt-get08:30:170
10794904716,12cyclictest19078-21apt-get08:15:120
10794904715,12cyclictest9345-21memory08:50:470
140612460,1sleep014062-21chrt07:15:160
10794904624,14cyclictest23844-21users08:21:280
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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