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2025-11-18 - 22:18

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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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: 50 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 rack4slot6s.osadl.org (updated Tue Nov 18, 2025 12:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3055423030,3sleep030552-21open_files11:45:260
689622520,2sleep06897-21/usr/sbin/munin12:20:130
978022400,2sleep09783-21idleruntime08:20:150
578721410,3chrt5784-21ntpq12:15:230
191921390,4chrt1920-21/usr/sbin/munin12:00:220
3174321380,4chrt31744-21/usr/sbin/munin11:50:220
455321300,4chrt4554-21latency10:05:200
1886921300,3sleep018868-21/usr/sbin/munin08:55:210
2822021280,3chrt28219-21/usr/sbin/munin07:25:210
239419911610,92cyclictest30251-21munin-run09:40:010
239419911411,88cyclictest18861-21/usr/sbin/munin11:00:210
23941991118,90cyclictest1977-21df_inode07:50:130
239419911129,71cyclictest30997-21/usr/sbin/munin09:40:320
239419911128,71cyclictest7049-21/usr/sbin/munin10:15:170
239419911110,86cyclictest4123-21munin-run12:10:000
23941991108,88cyclictest12577-21awk10:35:280
23941991108,87cyclictest31996-21sshd07:40:170
23941991108,86cyclictest25492-21awk09:20:210
239419911011,85cyclictest26434-21entropy11:30:120
23941991099,86cyclictest21616-21ntp_states09:05:260
23941991099,85cyclictest2958-21munin-run10:00:000
239419910910,88cyclictest30547-21df07:35:140
239419910910,85cyclictest3794-21users07:55:300
23941991089,87cyclictest17442-21irqstats10:55:160
23941991089,86cyclictest8461-21/usr/sbin/munin08:15:170
23941991089,85cyclictest27703-21df11:35:130
23941991089,84cyclictest20500-21/usr/sbin/munin11:05:330
23941991088,87cyclictest931-21ntp_states07:45:260
23941991088,85cyclictest556-21df_inode09:50:130
23941991087,89cyclictest31677-21/usr/sbin/munin09:45:320
23941991087,87cyclictest4384-21/usr/sbin/munin12:10:170
23941991087,87cyclictest15423-21chrt08:40:420
239419910819,78cyclictest29188-21netstat11:40:210
239419910810,85cyclictest10980-21tr12:35:250
23941991078,85cyclictest20561-21sed09:00:290
23941991069,85cyclictest29211-21/usr/sbin/munin07:30:290
23941991069,85cyclictest27646-21chrt07:23:460
23941991069,68cyclictest15367-21sshd10:45:460
23941991068,86cyclictest9718-21ntp_states12:30:280
23941991068,84cyclictest16194-21awk08:45:130
23941991067,87cyclictest6606-21seq08:07:050
23941991067,86cyclictest4997-21/usr/sbin/munin08:00:290
239419910630,66cyclictest11398-21/usr/sbin/munin08:25:280
239419910627,68cyclictest27946-21irqstats09:30:200
239419910627,67cyclictest14499-21seq08:38:210
239419910616,78cyclictest13448-21/usr/sbin/munin10:40:280
239419910610,81cyclictest16011-21/usr/sbin/munin10:50:310
23941991058,84cyclictest24374-21grep09:15:300
23941991058,84cyclictest22911-21ntp_states09:10:250
23941991058,83cyclictest26261-21ls11:30:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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