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2026-09-13 - 07:24

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 highest latencies:
System rackfslot4s.osadl.org (updated Sun Sep 13, 2026 00:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
214221200,2sleep02141-21seq22:18:590
1269021200,2sleep012687-21find23:23:020
1221421200,2chrt12216-21sort21:45:400
443721190,2chrt4351-21ntp_states22:22:040
697521170,2chrt6968-21diskstats22:26:140
3158521160,3chrt31588-21chrt00:40:010
1316821150,3chrt13169-21seq00:12:080
301021140,3chrt3011-21chrt23:08:440
2270521140,2sleep022707-21interrupts22:01:080
1945321140,2sleep019451-21if_err_eth220:15:430
2980521130,2chrt29806-21fschecks_time19:40:360
861921120,3chrt8620-21sleep00:05:450
2053321120,3chrt20534-21awk23:35:090
1870121120,2sleep018702-21sh21:55:350
1738021120,2chrt17381-21runrttasks00:18:200
1207221120,2chrt12070-21sshd22:33:250
2199021110,2chrt21974-21apt-get20:20:160
570821100,3chrt5709-21sleep19:54:150
2493521080,2sleep024937-21irqrtprio23:41:040
814821050,2chrt8149-21sleep20:49:590
210221040,2chrt2103-21sleep19:47:500
267352920,2sleep026734-21smartctl19:35:380
19592880,2sleep01960-21rm21:30:380
325382830,2sleep032539-21seq23:04:380
41112820,1sleep04113-21grep23:10:380
312922810,2sleep031293-21chrt23:50:540
224252800,2sleep022426-21rm21:12:050
88062790,2sleep08810-21wc23:17:140
68242790,2sleep06827-21seq00:02:240
327652780,2sleep032763-21python321:27:220
251052740,1sleep025106-21irqrtprio21:16:100
152762710,2sleep015277-21chrt21:50:310
274222700,1sleep027423-21seq20:27:520
120212700,1sleep012019-21idleruntime20:55:440
252452680,2sleep025246-21chrt22:05:190
307322660,2sleep030734-21ls21:25:040
242882660,2sleep024287-21seq00:28:530
277772635,9sleep027781-21df_inode23:45:450
154752596,42sleep015477-21irqstats21:00:480
187592580,1sleep018761-21latency_hist20:15:020
143262583,46sleep014329-21ntpq22:36:370
245812564,9sleep024610-21python319:31:270
202092543,9sleep020239-21ssh22:45:550
16862523,7sleep01690-21sleep20:39:220
212102514,38sleep021218-21seq19:26:090
195592510,1sleep019560-21ld00:21:220
86522503,8sleep08673-21df20:50:270
21632502,7sleep02160-21ssh23:55:570
200172502,41sleep020022-21sshd21:08:260
313202490,1sleep031339-21cut20:35:010
10536904818,23cyclictest0-21swapper22:52:390
84642479,24sleep08470-21ntpq19:05:360
250262473,35sleep024993-21apt-get00:30:220
10536904718,21cyclictest0-21swapper22:59:530
10536904717,21cyclictest0-21swapper23:32:350
10536904617,22cyclictest0-21swapper22:13:070
142972450,2chrt14296-21seq19:15:390
10536904517,22cyclictest0-21swapper21:43:510
10536904415,21cyclictest0-21swapper22:44:250
137562430,3sleep013746-21ntpq20:06:000
10536904313,22cyclictest0-21swapper21:38:030
103262430,3sleep010327-21cat20:01:140
108262420,1sleep010827-21aten2.4_rfpower19:10:260
10536904115,19cyclictest14601-21/usr/sbin/munin23:26:010
10536904112,10cyclictest2126-21/usr/sbin/munin20:40:480
1053690403,19cyclictest17894-21memory19:20:510
10536903914,18cyclictest6523-21df19:55:310
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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