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2026-07-23 - 18:14

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 50 highest latencies:
System rackfslot4s.osadl.org (updated Thu Jul 23, 2026 12:44:33)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2617321330,2sleep026174-21fschecks_count09:10:550
94321310,2sleep0944-21seq10:58:310
284021260,2chrt2841-21chrt11:01:290
2454121250,2chrt24540-21rm09:56:220
2327021250,2chrt23271-21sleep11:31:220
2300421230,3chrt23005-21fschecks_time09:05:370
1817021230,3chrt18171-21irqrtprio08:05:430
818521220,3chrt8120-21apt-get07:50:220
2117721220,2chrt21175-21ssh11:28:280
2926821200,3chrt29265-21perl11:40:530
197921200,2chrt682-21apt-get10:11:390
901621190,2sleep09018-21cut11:10:340
1368521170,3chrt13689-21sed08:50:430
1748521160,3chrt17486-21sleep08:56:390
670121140,4chrt6700-21/usr/sbin/munin09:30:340
354321130,2chrt3544-21timerwakeupswit07:41:280
1714921130,3chrt17150-21/usr/sbin/munin12:11:060
1134321120,2chrt11341-21python308:46:240
1117821110,3chrt11177-21sshd09:36:240
874821100,1sleep08752-21tr10:21:090
2755021100,3chrt27551-21chrt11:37:510
1171121100,3sleep011712-21seq12:02:510
3229821070,2chrt32299-21runrttasks12:34:080
2593821070,3chrt25939-21runrttasks12:24:450
1858821040,3chrt18591-21cut10:36:040
1293421030,2chrt12937-21timerandwakeup10:27:200
60432900,1sleep06041-21ntp_kernel_err07:45:510
17382890,2sleep01739-21chrt12:36:280
150212840,2sleep015019-21if_err_can010:31:000
317342830,2sleep031735-21seq09:19:070
297492830,1sleep029750-21chrt10:04:570
279442820,2sleep027971-21ls07:29:590
29242780,2sleep02925-21seq11:50:240
1557790787,18cyclictest5373-21ssh09:27:440
1557790785,19cyclictest21522-21sshd07:19:260
156572770,2sleep015659-21cut11:20:350
219122760,1sleep021913-21seq12:18:270
15577907614,54cyclictest6482-21ssh10:17:390
1550327512,49sleep015537-21munin-run07:10:010
294252740,1sleep029424-21sh07:31:130
1557790747,20cyclictest9089-21ssh11:59:340
1557790746,19cyclictest709-21ssh10:10:090
15577907416,9cyclictest25430-21diskmemload10:53:300
1557790737,10cyclictest20970-21apt-get10:40:250
1557790736,10cyclictest28452-21sleep12:27:500
1557790735,21cyclictest16433-21ssh09:45:040
1557790735,10cyclictest19400-21apt-get09:00:170
15577907316,11cyclictest21232-21ssh09:51:300
1557790726,20cyclictest32411-21runrttasks07:36:040
1557790725,19cyclictest21633-21ntpq08:10:560
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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