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2026-04-04 - 17:35

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #6

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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Data to construct the above plot have been generated using the RT test utility cyclictest.

Total number of samples: 50 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the highest latencies:
System rack4slot6s.osadl.org (updated Sat Apr 04, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
535222160,2sleep05354-21missed_timers07:45:190
902321230,2sleep09022-21cpu08:00:110
3175821200,3chrt31756-21users07:20:290
767321180,3chrt7674-21latency_hist07:55:010
743421150,4chrt7432-21df12:05:120
543221140,4chrt5410-21mailstats09:50:270
404021110,3chrt4043-21sed11:50:280
3012221090,4chrt30118-21ntpq07:15:210
1280921080,3sleep012843-21if_eth010:20:150
3213621020,4sleep032139-21df_inode11:35:130
2885321000,4sleep028916-21/usr/sbin/munin09:15:290
140772990,4sleep014013-21/usr/sbin/munin10:25:140
327442960,3sleep0346-21sed09:30:270
194932870,3sleep019565-21/usr/sbin/munin10:45:250
216052864,70sleep021635-21latency_hist10:55:000
63282853,8sleep06373-21/usr/sbin/munin09:55:150
14062790,3sleep01089-21/usr/sbin/munin09:35:250
208332780,3sleep020837-21missed_timers08:45:190
183322724,58sleep018336-21ntp_states08:35:220
2726627018,30sleep027316-21df07:05:130
101242706,52sleep010174-21df10:10:100
2846199608,19cyclictest15297-21/usr/sbin/munin10:30:120
28461996035,17cyclictest19450-21/usr/sbin/munin08:40:150
28461996031,19cyclictest0-21swapper12:10:100
28461996010,17cyclictest30794-21/usr/sbin/munin11:30:250
28461995934,16cyclictest8914-21runrttasks10:05:140
28461995911,15cyclictest15762-21/usr/sbin/munin08:25:200
28461995910,16cyclictest15111-21/usr/sbin/munin12:35:190
2846199586,17cyclictest29515-21/usr/sbin/munin11:25:210
28461995834,16cyclictest3740-21runrttasks09:45:120
28461995832,15cyclictest14481-21/usr/sbin/munin08:20:210
28461995832,15cyclictest1011-21/usr/sbin/munin11:40:150
28461995817,14cyclictest7710-21/usr/sbin/munin07:55:190
2846199579,16cyclictest28515-21ntp_states11:20:200
2846199579,15cyclictest7558-21/usr/sbin/munin10:00:210
2846199579,13cyclictest2259-21df11:45:110
2846199578,19cyclictest16759-21/usr/sbin/munin08:30:300
2846199578,13cyclictest6086-21/usr/sbin/munin12:00:300
28461995732,16cyclictest29844-21/usr/sbin/munin09:20:150
28461995729,17cyclictest27500-21/usr/sbin/munin11:15:280
28461995715,16cyclictest15072-21latency_hist12:35:020
28461995711,17cyclictest28615-21df07:10:120
28461995710,16cyclictest26027-21wc11:10:240
28461995710,16cyclictest17944-21df10:40:110
28461995710,15cyclictest31280-21ntp_states09:25:240
28461995710,15cyclictest307-21munin-node08:55:100
2846199569,14cyclictest23178-21if_eth011:00:150
2846199568,16cyclictest17746-21sendmail10:40:000
2846199568,16cyclictest12876-21/usr/sbin/munin08:15:280
2846199567,17cyclictest4776-21/usr/sbin/munin11:55:230
2846199567,17cyclictest2401-21/usr/sbin/munin09:40:140
2846199567,16cyclictest21749-21grep10:55:130
2846199567,13cyclictest3864-21/usr/sbin/munin07:40:150
28461995632,16cyclictest3458-21runrttasks07:37:590
28461995632,15cyclictest24605-21/usr/sbin/munin09:00:140
28461995631,17cyclictest11023-21runrttasks12:19:200
2846199558,16cyclictest10492-21/usr/sbin/munin08:05:190
2846199558,15cyclictest27095-21/usr/sbin/munin09:10:270
2846199558,15cyclictest25798-21/usr/sbin/munin09:05:220
2846199558,15cyclictest24424-21fw_packets11:05:150
28461995533,15cyclictest462-21/usr/sbin/munin07:25:270
28461995530,16cyclictest1681-21/usr/sbin/munin07:30:250
28461995510,18cyclictest11548-21ntp_states12:20:210
28461995510,14cyclictest12599-21df12:25:140
2846199548,15cyclictest11714-21/usr/sbin/munin10:15:230
2846199547,14cyclictest22130-21/usr/sbin/munin08:50:210
2846199546,15cyclictest11592-21/usr/sbin/munin08:10:240
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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