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2026-04-24 - 01:40

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 all highest latencies:
System rack4slot6s.osadl.org (updated Thu Apr 23, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2042722590,2sleep020426-21sendmail_mailst09:05:250
1381222500,3sleep013814-21netstat08:40:190
561821380,4chrt5617-21/usr/sbin/munin12:20:140
476921270,4chrt4768-21/usr/sbin/munin08:05:190
421121250,3sleep04212-21cron10:10:000
2386921240,5chrt23867-21ls09:20:020
703021210,4chrt7028-21ntp_kernel_pll_12:25:200
2827021210,4chrt28271-21/usr/sbin/munin07:30:250
1052921210,4chrt10530-21latency_hist12:40:010
226719911710,93cyclictest28485-21sshd09:36:250
226719911612,13cyclictest288-21snmpd11:00:260
2306221150,4sleep023066-21ntp_states07:10:200
22671991159,16cyclictest9878-21memory08:25:180
22671991157,14cyclictest1735-21seq07:54:340
2148921150,3sleep021493-21memory09:10:150
22671991148,14cyclictest8472-21df_inode08:20:140
22671991147,15cyclictest2058-21ntp_states10:00:220
22671991147,14cyclictest31641-21memory11:55:180
22671991147,13cyclictest3184-21ls08:00:010
22671991146,17cyclictest29886-21seq11:48:460
853821130,2chrt8530-21open_files10:25:230
22671991139,91cyclictest13537-21chrt10:45:180
22671991138,92cyclictest4821-21sshd10:10:260
22671991137,14cyclictest30129-21chrt07:37:580
22671991137,14cyclictest16788-21runrttasks10:57:220
22671991137,12cyclictest16416-21ntp_states08:50:210
22671991129,14cyclictest27604-21/usr/sbin/munin11:40:260
22671991128,16cyclictest15023-21sort08:45:180
22671991127,16cyclictest19153-21chrt11:05:300
22671991127,13cyclictest31141-21/usr/sbin/munin07:40:300
22671991127,13cyclictest24115-21df_inode07:15:140
226719911215,83cyclictest11456-21switchtime08:30:260
226719911210,13cyclictest22083-21seq11:18:220
2034421120,3sleep020346-21switchtime11:10:260
22671991118,14cyclictest4493-21/usr/sbin/munin12:15:260
22671991117,15cyclictest31158-21chrt09:47:060
22671991117,13cyclictest31956-21/usr/sbin/munin07:45:140
22671991117,13cyclictest276-21runrttasks09:41:220
22671991117,12cyclictest9596-21/usr/sbin/munin10:30:140
226719911132,68cyclictest27677-21runrttasks07:28:540
226719911128,71cyclictest6012-21sshd10:15:250
22671991108,14cyclictest26604-21latency_hist07:25:010
22671991107,19cyclictest12546-21ntp_states08:35:220
22671991107,14cyclictest30249-21awk11:50:140
22671991107,13cyclictest7417-21/usr/sbin/munin10:20:260
22671991107,13cyclictest589-21ntp_states12:00:220
298121090,4chrt2980-21if_err_eth012:10:130
22671991099,86cyclictest24312-21ps09:20:260
22671991098,16cyclictest8046-21/usr/sbin/munin12:30:310
22671991098,13cyclictest23811-21fw_packets11:25:140
22671991098,12cyclictest32992sleep008:00:140
22671991098,12cyclictest14919-21/usr/sbin/munin10:50:180
22671991097,15cyclictest25069-21df_inode11:30:110
22671991096,14cyclictest2818-21date12:10:020
226719910925,73cyclictest946-21ntpd08:10:230
22671991089,87cyclictest23248-21runrttasks11:22:060
22671991088,14cyclictest10898-21if_err_eth010:35:140
22671991088,12cyclictest32235-21users09:50:300
22671991088,12cyclictest17924-21sshd08:55:260
22671991087,14cyclictest13227-21chrt10:44:460
22671991078,15cyclictest1277-21runrttasks09:57:140
22671991077,13cyclictest27508-21latency_hist11:40:020
22671991067,12cyclictest25489-21ntp_states09:25:220
22671991056,12cyclictest7362-21ntpq08:15:220
226719910510,14cyclictest18773-21df09:00:110
22671991049,16cyclictest26482-21/usr/sbin/munin09:30:150
22671991005,11cyclictest22732-21latency_hist07:10:020
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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