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2026-03-28 - 19:51

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 Sat Mar 28, 2026 12:44:35)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2561221260,2chrt25609-21ntpq09:01:500
3107521250,3chrt31071-21ssh12:25:300
2696021240,3chrt26954-21df11:30:410
2031821210,3chrt20319-21runrttasks12:08:560
516921190,2sleep05170-21runrttasks10:09:220
2984921180,1sleep029896-21awk11:35:110
2442821170,3chrt24429-21sleep10:37:550
488321160,2sleep04884-21chrt12:34:550
2476421160,2chrt24765-21seq12:15:490
1798121150,2sleep017982-21chrt08:50:260
1616821150,2chrt16167-21awk07:55:260
928521140,3chrt9286-21runrttasks11:03:570
394321130,2chrt3942-21seq11:44:510
1837121130,3chrt18372-21sh09:40:330
705621110,2chrt7057-21sleep08:31:460
2587821080,2sleep025879-21seq11:28:530
1582921080,2sleep015831-21wc07:55:030
893821050,2chrt8939-21sleep07:43:470
2024121050,2sleep020243-21cpu11:20:380
1758221050,2sleep017583-21timerandwakeup10:27:190
618921000,2sleep06190-21seq10:59:320
3068421000,2sleep030685-21chrt10:46:570
2938721000,2chrt29388-21sh09:07:440
297452980,1sleep029747-21awk07:25:250
214852940,1sleep021487-21runrttasks08:55:430
15352910,2sleep01536-21chrt07:31:160
290052870,2sleep029008-21sed09:56:030
21862870,2sleep02187-21chrt08:25:090
9542850,1sleep0955-21ssh10:02:220
52362850,1sleep05239-21apt-key12:35:120
59852840,2sleep05987-21ld11:47:120
68182810,2sleep06819-21chrt09:22:390
87542800,2sleep08755-21cron10:15:000
179822800,2sleep017986-21tr09:40:010
96882770,2sleep09690-21chrt10:16:000
255392770,2sleep025540-21if_err_eth109:50:590
17372770,1sleep01738-21seq09:15:430
220192700,2sleep022023-21tr12:11:080
147052700,2sleep014706-21latency_hist09:35:040
103852700,2sleep010386-21fschecks_count07:46:020
145442690,1sleep014545-21sh10:22:520
270462670,2sleep027047-21basename07:20:400
8642660,2sleep0867-21cut10:51:060
308352660,1sleep030837-21sort12:25:040
263422640,1sleep026415-21runrttasks07:20:040
133462570,2sleep013347-21chrt11:10:280
106922563,44sleep010695-21seq11:54:460
260472550,2sleep026051-21chrt08:10:460
85352536,39sleep08599-21grep09:25:500
244012533,42sleep07315-21runrttasks09:49:320
96662513,40sleep09665-21ntpq08:36:130
198692513,6sleep019801-21irqrtprio10:31:080
214782503,38sleep021475-21ntpq07:11:090
165802500,1sleep016583-21seq12:02:550
203292493,7sleep020348-21ntpq08:01:090
185872490,3chrt18585-21/usr/sbin/munin11:17:250
20115904819,22cyclictest0-21swapper11:58:490
320932472,6sleep032101-21smartctl08:20:400
20115904718,22cyclictest0-21swapper09:14:410
121092472,6sleep012106-21ssh11:07:480
33722460,2sleep03368-21sshd07:35:170
2003424611,19sleep020075-21munin-run07:10:020
122632440,2chrt12262-21sed08:40:430
20115904315,21cyclictest0-21swapper10:44:420
225722411,4sleep00-21swapper08:05:320
2011590404,28cyclictest29681-21ntpq08:16:130
2011590394,8cyclictest15145-21hddtemp_smartct08:45:360
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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