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2024-12-10 - 13:36

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #b, 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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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 20 highest latencies:
System rackbslot6s.osadl.org (updated Thu Aug 29, 2024 00:43:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
32725911810,5ptp4l241ktimersoftd/100:55:171
383521040,3sleep00-21swapper/003:44:460
128352990,11sleep0111rcuc/000:54:470
326602930,7sleep132656-21grep05:45:061
3272591780,2ptp4l241ktimersoftd/101:24:551
13694997211,29cyclictest874-21diskmemload04:14:210
13694996519,19cyclictest874-21diskmemload05:58:510
13694996418,19cyclictest1179-21apt-get02:59:380
3272591620,1ptp4l241ktimersoftd/106:24:271
3272591620,1ptp4l241ktimersoftd/103:41:281
13694996219,18cyclictest14158-21ssh03:58:410
13694996218,22cyclictest874-21diskmemload05:01:510
13694996116,22cyclictest874-21diskmemload03:31:530
13694996018,15cyclictest19933-21ssh06:14:030
13694996017,19cyclictest30781-21kworker/u4:204:26:500
13694996014,26cyclictest23558-21/usr/sbin/munin06:19:390
13694995918,19cyclictest13501-21ssh05:20:220
13694995918,19cyclictest13501-21ssh05:20:220
13694995918,18cyclictest24172-21ssh04:54:090
13694995917,18cyclictest1707-21ssh05:48:200
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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