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2024-04-20 - 00:16

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 12:44:19)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2148399292,5cyclictest14430-40apt-check08:25:053
21483992816,7cyclictest11950-21apt-get11:35:123
21483992615,8cyclictest13970-21python308:25:013
2148399251,21cyclictest18797-21cut11:55:003
2148399251,20cyclictest21576-40apt-check08:45:063
2148399251,17cyclictest9933-21/usr/sbin/munin09:45:163
21469992415,7cyclictest11396-21cat08:15:170
2148399231,6cyclictest21102-21python308:45:013
21483992315,6cyclictest25119-21awk07:20:003
2148399230,7cyclictest841-21sendmail12:40:003
2148399230,7cyclictest31141-21id09:15:003
2148099230,7cyclictest1718950snmpd10:48:422
2148399222,3cyclictest25172-21idleruntime-cro12:15:003
2148399221,7cyclictest9075-21munin-run08:09:593
2148399221,6cyclictest24605-21dpkg08:55:013
21483992216,4cyclictest7463-21munin-run08:04:593
21483992214,6cyclictest719-21cat09:20:003
2148399221,19cyclictest24664-21munin-run10:34:593
2148399221,18cyclictest16619-21python311:50:003
2148099222,14cyclictest17189-21snmpd08:05:112
2148099222,14cyclictest17189-21snmpd07:50:132
2148099221,6cyclictest2887-21missed_timers11:05:172
21476992215,5cyclictest25574-21df_inode12:15:141
21476992213,6cyclictest9398-21cat09:45:001
21469992213,6cyclictest5006-21tune2fs09:30:160
21483992113,6cyclictest8338-21sed09:40:153
21483992113,6cyclictest28603-21date07:30:003
21483992113,5cyclictest73550irq/132-enp2s011:20:133
21483992113,5cyclictest26793-21uname12:20:003
2148399211,17cyclictest4213-21munin-run07:55:003
2148399210,4cyclictest6872-21perf11:20:013
2148399210,18cyclictest16274-21munin-run10:05:013
2148399210,18cyclictest11733-21munin-run11:34:593
2148099212,13cyclictest4422-21apt-get07:55:112
21480992113,6cyclictest28634-21/usr/sbin/munin12:25:232
21480992113,6cyclictest19617-21expr08:40:122
2148099211,15cyclictest17860-21apt-get08:35:112
2148099211,14cyclictest13243-21apt-get09:55:112
21476992114,5cyclictest12190-21awk08:15:281
21476992113,6cyclictest24258-21cat12:10:171
21476992113,6cyclictest10490-21expr11:30:131
2147699211,14cyclictest29729-21apt-get09:10:121
21469992114,5cyclictest3269-21diskstats09:25:130
21469992113,6cyclictest5659-21df_inode11:15:120
2146999211,13cyclictest14629-21apt-get08:25:130
2148399203,15cyclictest6096-21awk09:35:003
2148399203,15cyclictest22905-21latency_hist07:15:013
2148399202,16cyclictest23039-21latency_hist10:29:593
21483992016,2cyclictest20325-21fschecks_time10:20:113
21483992015,3cyclictest19845-21latency_hist10:20:003
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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