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2024-04-19 - 12:58

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, 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.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rackcslot4s.osadl.org (updated Fri Apr 19, 2024 00:44:18)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1291999440,23cyclictest10395-21uname22:15:002
1291999431,24cyclictest15792-21latency_hist22:30:012
1291999330,30cyclictest24786-21fschecks_time22:55:142
1291999322,27cyclictest12891-21head23:55:282
1291999300,27cyclictest25396-21grep00:35:142
1291999300,15cyclictest0-21swapper/221:15:142
12919992912,15cyclictest17741-21awk00:10:262
1290799293,7cyclictest17263-21apt-get19:20:130
12919992814,11cyclictest24196-21sh00:30:202
12919992813,13cyclictest13950-21snmp_o5powerctl19:10:242
1291999271,23cyclictest3883-21ntpq20:15:202
1291999271,23cyclictest2288-21ls21:50:012
1291999271,23cyclictest18762-21ntpq22:35:202
1291999271,22cyclictest9113-21ntpq23:45:212
1291999271,22cyclictest17998-21ntpq19:20:232
12919992712,13cyclictest13628-21expr00:00:172
1291999270,24cyclictest21226-21tune2fs19:30:152
1291999270,24cyclictest21064-21turbostat22:45:002
1291999263,20cyclictest23212-21ls00:29:592
12919992613,11cyclictest32642-21/usr/sbin/munin23:20:172
1291999261,23cyclictest23805-21grep19:35:272
1291999261,22cyclictest6184-21dpkg20:25:012
1291999261,22cyclictest6184-21dpkg20:25:002
1291999261,22cyclictest29151-21ntp_kernel_pll_21:30:182
1291999261,22cyclictest18822-21grep00:15:192
1291999261,22cyclictest14522-21apt-config20:50:022
12919992611,13cyclictest21780-21cut21:10:172
12919992611,12cyclictest22216-21which22:45:212
12919992611,12cyclictest12515-21tr22:20:002
12919992610,14cyclictest8504-21cat20:30:142
1291999260,23cyclictest651-21awk21:44:592
1291999260,23cyclictest26156-21/usr/sbin/munin23:00:172
1291999260,23cyclictest1314-21lsb_release20:09:592
1291999260,23cyclictest12037-21ntp_states20:40:222
12907992615,7cyclictest19855-21apt-get21:05:140
1292499251,20cyclictest14780-40apt-check20:50:073
1291999258,14cyclictest16878-21iwlist22:30:162
1291999251,22cyclictest26724-21grep19:45:212
1291999251,22cyclictest19175-21update-motd-upd19:25:012
1291999251,21cyclictest8044-21head23:40:272
1291999251,21cyclictest7634-21sed20:25:252
1291999251,21cyclictest4866-21ntp_kernel_err21:55:202
1291999251,21cyclictest4132-21wc23:30:182
1291999251,21cyclictest2821-21cut21:50:152
1291999251,21cyclictest25441-21sed19:40:272
1291999251,21cyclictest18479-21fschecks_count21:00:162
1291999251,21cyclictest16267-21lsb_release00:10:012
1291999251,21cyclictest13450-21awk22:20:182
1291999251,19cyclictest14287-21apt-get20:50:132
1291999251,18cyclictest16596-21apt-get20:55:102
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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