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2025-12-18 - 14:54

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 792 highest latencies:
System rack4slot6s.osadl.org (updated Thu Dec 18, 2025 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2476422540,3sleep024763-21wc10:45:170
1560522510,2sleep015606-21df10:10:120
1694521450,2sleep016946-21if_eth010:15:130
2228821280,2sleep022289-21cat08:30:160
811021200,5chrt8108-21memory07:35:180
170921190,3chrt1710-21/usr/sbin/munin07:10:150
1548321160,3chrt15484-21latency_hist10:10:010
1975321100,4chrt19754-21missed_timers08:20:170
142312990,4sleep014089-21/usr/sbin/munin12:10:180
323522980,3sleep032417-21latency_hist09:10:010
210152970,3sleep021041-21/usr/sbin/munin08:25:200
128922950,4sleep012943-21irqstats12:05:150
3442940,3sleep0355-21ls07:05:150
119912946,13sleep012057-21timerandwakeup12:00:280
302322900,4sleep030298-21mailstats09:00:250
178532870,2sleep017854-21modprobe12:25:000
323982860,4sleep032436-21/usr/sbin/munin11:15:150
68812820,3chrt6876-21timerandwakeup11:40:300
319632805,8sleep00-21swapper11:13:040
166162740,3sleep016617-21latency_hist12:20:010
1369996723,15cyclictest22083-21/usr/sbin/munin10:35:140
1369996134,16cyclictest5709-21/usr/sbin/munin07:25:250
1369996035,16cyclictest29166-21/usr/sbin/munin08:55:290
1369996035,16cyclictest18662-21/usr/sbin/munin10:20:250
1369996010,16cyclictest8369-21sshd11:46:330
136999599,17cyclictest2473-21munin-run09:20:000
136999598,18cyclictest3032-21ntp_states07:15:200
251592580,2sleep025161-21grep08:40:260
136999589,15cyclictest26466-21grep08:45:250
136999588,15cyclictest5230-21df09:30:120
1369995835,14cyclictest27486-21/usr/sbin/munin10:55:220
1369995834,16cyclictest19915-21runrttasks12:30:570
1369995834,14cyclictest27769-21/usr/sbin/munin08:50:270
1369995833,16cyclictest29599-21runrttasks11:04:460
1369995833,16cyclictest23542-21/usr/sbin/munin08:35:170
1369995832,16cyclictest20945-21/usr/sbin/munin12:35:250
1369995832,16cyclictest14681-21runrttasks08:00:210
1369995832,15cyclictest8979-21/usr/sbin/munin11:50:140
1369995831,17cyclictest4082-21/usr/sbin/munin09:25:170
1369995829,20cyclictest21751-21sshd10:34:020
1369995811,16cyclictest32532-21df_inode09:10:150
136999578,15cyclictest13027-21/usr/sbin/munin10:00:110
136999577,18cyclictest25876-21/usr/sbin/munin10:50:290
136999577,17cyclictest10201-21/usr/sbin/munin11:55:150
1369995735,15cyclictest12816-21runrttasks10:00:000
1369995718,15cyclictest19218-21runrttasks08:18:290
136999569,16cyclictest15728-21df08:05:100
136999568,15cyclictest5230-21memory11:35:180
136999568,15cyclictest10697-21/usr/sbin/munin09:50:240
136999567,17cyclictest9230-21/usr/sbin/munin07:40:270
136999567,17cyclictest4046-21ntp_states11:30:240
136999567,16cyclictest18016-21egrep12:25:110
1369995630,15cyclictest17094-21/usr/sbin/munin08:10:160
1369995611,15cyclictest24343-21sshd10:44:020
1369995610,15cyclictest11108-21/usr/sbin/munin07:45:300
136999559,14cyclictest13271-21/usr/sbin/munin07:55:190
136999558,14cyclictest6638-21/usr/sbin/munin07:30:280
136999558,14cyclictest4215-21irqstats07:20:160
136999558,14cyclictest2478-21/usr/sbin/munin11:25:210
136999557,15cyclictest9101-21/usr/sbin/munin09:45:170
1369995533,15cyclictest2192-21runrttasks11:23:450
1369995531,15cyclictest8162-21/usr/sbin/munin09:40:240
1369995530,16cyclictest6654-21/usr/sbin/munin09:35:170
136999549,16cyclictest2804-21memory09:20:180
136999548,17cyclictest29767-21/usr/sbin/munin11:05:150
136999547,14cyclictest11795-21/usr/sbin/munin07:50:300
136999538,15cyclictest19704-21/usr/sbin/munin10:25:200
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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