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2026-08-30 - 21:34

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 Sun Aug 30, 2026 12:44:33)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2719921270,2chrt27200-21runrttasks12:03:070
2197221210,2chrt21973-21missed_timers11:06:150
416621180,3chrt4162-21ntpq12:17:050
2998921170,2chrt29988-21ssh11:18:390
157721170,4chrt1578-21if_can010:35:590
2035021150,2chrt20349-21ssh11:52:380
251321140,3chrt2515-21modprobe09:00:000
2400821140,3chrt24007-21/usr/sbin/munin09:31:510
1888921140,2chrt18890-21runrttasks09:25:070
1057021140,2chrt10572-21sh10:49:490
2914821130,1sleep029145-21tune2fs12:06:250
1046921130,3chrt10467-21ld12:26:260
849921120,3chrt8500-21sh09:57:200
2046021120,2chrt20459-21seq11:04:400
338521110,2chrt3383-21ld07:16:100
1572021110,4chrt15702-21ntpq07:36:010
2116921100,2sleep021170-21ntp_states09:27:570
3134621080,2chrt31347-21ld10:31:300
396621070,2sleep03967-21chrt11:28:070
1527121070,2chrt15272-21chrt09:19:360
2738321060,2sleep027384-21seq07:55:330
2240521060,3chrt22406-21ssh10:18:330
1364521060,2sleep013646-21seq10:54:170
2577621030,2chrt25777-21chrt10:23:370
604521010,3chrt6046-21sleep08:12:560
69832960,2sleep06984-21seq11:32:260
89962950,2sleep08997-21if_err_eth107:25:430
74152940,2sleep07416-21seq08:15:340
147672870,2sleep014770-21tr12:33:030
23252840,2sleep02327-21chrt08:06:290
173502830,1sleep017351-21if_eth110:11:000
239792820,2sleep023981-21cut07:50:220
293502810,2sleep029348-21grep08:50:340
326652780,1sleep032666-21basename09:45:330
119912780,2sleep011992-21cat11:40:370
50922770,2sleep05095-21cut10:41:050
197552760,2sleep019752-21df_inode08:35:290
319412750,2sleep031940-21awk12:10:350
14892730,2sleep01490-21chrt11:25:040
28272720,1sleep02828-21aten2.4-expect09:00:230
295152710,2sleep029516-21chrt10:29:170
56972700,2sleep05698-21chrt09:53:160
89982690,2sleep08997-21seq09:10:170
160862690,2sleep016088-21cut12:35:300
306862680,2sleep030687-21chrt08:00:390
167412670,1sleep016742-21basename11:47:140
146552650,2sleep014657-21grep10:55:490
262602630,2sleep026261-21seq11:12:400
62842610,2sleep06285-21seq09:05:370
262552590,2sleep026256-21seq08:45:330
284392580,2sleep028440-21seq09:38:540
131232580,1sleep013092-21pluginstate10:05:050
132842560,1sleep013285-21chrt10:05:130
31365905219,25cyclictest0-21swapper08:21:260
82362510,1sleep08237-21cat07:25:030
2838725115,21sleep028369-21apt-get07:05:150
31365905018,21cyclictest0-21swapper11:39:230
31365904919,22cyclictest0-21swapper12:20:080
31365904817,22cyclictest0-21swapper09:44:160
3136590465,30cyclictest14381-21ntpq08:26:050
211442460,3chrt21145-21runrttasks07:45:300
31365904516,21cyclictest0-21swapper11:57:290
16772450,2sleep01676-21seq07:14:150
144472420,2chrt14446-21date07:35:020
3136590415,10cyclictest19357-21users07:41:310
3136590403,10cyclictest16665-21df_inode08:30:300
31365904014,19cyclictest24240-21ntpq08:41:560
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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