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2026-03-27 - 23:43

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 792 highest latencies:
System rackfslot4s.osadl.org (updated Fri Mar 27, 2026 12:44:35)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
302521390,2sleep03026-21rm09:49:420
1067121340,3chrt10226-21/usr/sbin/munin08:20:330
596821280,2sleep05970-21cut11:30:490
2015021230,3chrt20139-21ntpq11:51:410
965121220,3chrt9652-21/usr/sbin/munin07:26:230
2894621210,2chrt28947-21chrt11:16:170
400421190,3chrt4005-21chrt09:50:560
3023921180,2chrt30238-21sshd12:06:370
615921160,2chrt6153-21memory07:20:490
154821160,2sleep01549-21cpuspeed10:35:360
75321150,2chrt754-21sleep11:22:510
2790221130,2chrt27903-21seq12:03:120
1776121100,2chrt17760-21apt-config07:40:110
1774921100,2sleep017750-21timerwakeupswit09:22:260
564721070,2chrt5648-21sleep12:18:470
512621070,2sleep05124-21fw_packets10:40:520
1650321060,3chrt16506-21latency11:46:090
401121050,2chrt4012-21seq08:10:120
2887221050,1sleep028873-21runrttasks08:50:120
2989621010,2sleep029898-21seq10:29:540
287621000,3chrt2877-21sh08:07:240
29572950,2sleep02958-21date12:15:040
21702930,2sleep02171-21chrt11:25:200
119432920,1sleep011944-21runrttasks09:14:320
256152880,1sleep025616-21sh11:11:150
174272880,1sleep017425-21basename07:40:010
125032860,2sleep012504-21chrt11:40:410
113942850,2sleep011395-21runrttasks07:30:130
288242840,2sleep028825-21ssh09:39:510
202692840,2sleep020271-21cut10:15:340
150312840,2sleep015032-21tune2fs10:55:510
82122830,1sleep08214-21chrt09:56:510
181982820,1sleep018199-21seq10:11:440
309692809,57sleep031006-21munin-run07:10:010
301312790,1sleep030132-21latency_hist08:00:030
94212750,2sleep09422-21/usr/sbin/munin10:46:580
31050907543,23cyclictest25078-21ntpq10:22:030
140872740,2sleep014089-21sort10:05:590
38962720,2sleep03897-21chrt09:01:110
31050907241,22cyclictest11098-21ntpq12:26:380
31050907240,12cyclictest29553-21df_inode09:40:440
31050907238,16cyclictest30485-21runrttasks10:30:310
31050907139,21cyclictest412-21snmpd07:50:290
31050907139,21cyclictest26909-21runrttasks08:46:020
31050907138,22cyclictest21130-21ssh09:27:310
31050907137,14cyclictest13875-21gcc09:16:520
31050907137,14cyclictest12667-21ntp_states10:52:010
238302710,1sleep023831-21chrt11:09:040
15402710,2sleep01541-21seq07:14:450
31050907039,22cyclictest6771-21df12:20:370
31050907039,20cyclictest10077-21ssh11:36:310
31050907038,23cyclictest16734-21/usr/sbin/munin12:35:380
31050907038,22cyclictest412-21snmpd08:30:400
31050907037,23cyclictest14063-21irqstats12:31:080
31050906943,15cyclictest21848-21apt-get11:55:380
31050906938,22cyclictest19126-21chrt11:01:300
31050906937,23cyclictest19490-21chrt08:35:040
31050906837,12cyclictest23821-21ld08:41:010
31050906742,15cyclictest13700-21runrttasks08:25:310
31050906737,20cyclictest4983-21latency_hist07:20:040
31050906736,22cyclictest620-21ntpq08:55:590
31050906642,16cyclictest22538-21chrt09:30:310
31050906637,20cyclictest31063-21sshd08:00:430
31050906636,22cyclictest8350-21runrttasks08:16:090
31050906542,14cyclictest10493-21ssh10:00:450
31050906538,17cyclictest5996-21grep09:05:260
31050906533,14cyclictest22217-21ntp_states07:46:160
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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