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2026-04-20 - 05:41

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 Mon Apr 20, 2026 00:44:35)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
846221230,2chrt8463-21sleep00:36:570
414121200,2chrt4114-21apt-get22:05:150
888521190,3chrt8886-21runrttasks23:49:400
523621170,2chrt5237-21seq23:43:530
463621170,3chrt3233-21apt-get00:31:450
1021821170,2chrt10220-21ssh22:14:120
2607921160,3chrt26075-21ntpq19:15:530
1401321160,2chrt14016-21sed21:31:090
1982321140,3chrt19824-21sh19:58:330
2846621130,2chrt28467-21sleep21:04:110
2343121120,3chrt23432-21seq23:22:120
1616121120,2chrt16160-21seq22:22:280
133921120,2chrt1338-21ntpq21:12:170
466421110,2sleep04665-21chrt22:54:300
2360421110,2chrt23606-21rm22:33:590
3272721100,2chrt32726-21sed23:36:060
202921100,3chrt2027-21ld20:20:530
2662121090,2chrt26622-21sleep23:26:560
3101121080,2chrt31012-21chrt23:33:510
2890721080,2chrt28906-21ssh21:53:060
231521070,2chrt2318-21grep19:30:370
2097221070,3chrt20973-21seq23:18:440
2227821040,2sleep022279-21chrt00:09:530
529921030,2sleep05303-21aten2.4_rfpower22:55:320
139321020,2chrt1394-21sh22:49:380
1141821020,2sleep011419-21seq23:04:430
3256521000,2chrt32567-21sh21:58:540
270412960,2sleep027042-21/usr/sbin/munin00:16:150
311782950,2sleep031180-21sort19:25:020
179742950,2sleep017975-21basename22:25:520
69442930,2sleep06946-21grep21:20:550
242622890,2sleep024263-21seq00:12:130
195472820,2sleep019552-21chrt21:40:000
317812780,2sleep031783-21chrt00:23:420
161092780,1sleep016110-21chrt23:11:090
324642760,2sleep032465-21ntpq19:26:060
213712760,2sleep021370-21seq21:42:020
98502750,1sleep09852-21aten2.4_rfpower21:25:340
35672740,1sleep03568-21fschecks_time21:15:520
235652710,1sleep023566-21who19:11:290
199112708,48sleep019915-21ntp_states19:05:500
306652690,2sleep030666-21ssh22:44:570
132132670,2sleep013216-21seq22:18:240
250372583,8sleep024968-21ssh22:36:030
246702570,2sleep024667-21tune2fs20:06:260
165422573,9sleep016552-21hddtemp_smartct00:00:580
55632550,2sleep05564-21seq20:26:250
273432555,7sleep027347-21diskstats20:10:310
311242540,1sleep031125-21perl20:16:280
236052544,8sleep023609-21irqstats20:55:460
149452540,1sleep014946-21if_err_eth119:50:420
58782530,2sleep05879-21runrttasks19:35:430
247632520,1sleep024790-21wc21:47:040
139802480,1sleep013981-21chrt23:56:420
123872483,9sleep011744-21/usr/sbin/munin23:05:570
21797904717,22cyclictest0-21swapper22:00:110
2179790456,20cyclictest528-21df_inode00:25:450
21797904513,24cyclictest0-21swapper23:52:390
101262450,1sleep010127-21chrt20:35:010
2179790435,10cyclictest29918-21memory21:05:480
2179790425,9cyclictest11605-21ntpq20:36:200
2179790424,12cyclictest21604-21ntpq20:00:530
21797904220,15cyclictest0-21swapper20:45:240
2179790414,10cyclictest13935-21hddtemp_smartct20:40:370
21797904114,20cyclictest21176-21find20:51:280
21797904114,10cyclictest7315-21runrttasks19:45:310
21797904012,10cyclictest9435-21ntp_states19:41:180
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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