You are here: Home / Projects / OSADL QA Farm Real-time / Latency plots / 
2022-06-29 - 15:54

x86 Intel Atom x6425RE @1900 MHz, Linux 5.18.0-rt11 (Profile)

Latency plot of system in rack #e, slot #8
Data to construct the above plot have been generated using the RT test utility cyclictest.
Unexpectedly long latencies may be caused by SMIs
Command line: cyclictest -l100000000 -m -Sp99 -i200 -h800 -q
Total number of samples: 100 million
Resolution of latency scale: reduced 
Duration: 5 hours, 33 minutes, lowest P state: performance
Characteristics of the 20 highest latencies:
System rackeslot8.osadl.org (updated Mon Jun 06, 2022 00:44:13)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
154732899811,74cyclictest1-21systemd23:59:560
619589670,0phc2sys0-21swapper/121:20:111
619589670,0phc2sys0-21swapper/121:20:111
23903756556,7pubsub_TSN_loop1567759-21kworker/u8:1+flush-8:021:09:383
1547313996558,5cyclictest1560791-21apt-get19:24:270
23903756460,3pubsub_TSN_loop1718421-21kworker/u8:1+flush-8:022:10:113
1547313996055,3cyclictest1781786-21apt-get22:47:030
1547313996055,3cyclictest1591486-21latency_hist19:59:320
23903755955,3pubsub_TSN_loop1567759-21kworker/u8:1+flush-8:020:19:583
23903755955,3pubsub_TSN_loop1567759-21kworker/u8:1+flush-8:020:19:583
1547313995853,4cyclictest262-21systemd-journal00:19:590
154733099570,51cyclictest1803870-21munin-run23:04:520
1547313995650,4cyclictest262-21systemd-journal23:45:090
23905225552,2pubsub_TSN_loop1555056-21kworker/u8:0+flush-8:019:19:513
23901785548,5pubsub_TSN_loop1855490-21kworker/u8:2+flush-8:000:05:212
1547328995546,5cyclictest1705880-21apt-get21:49:520
1547313995550,3cyclictest1705100-21gpgv21:49:440
23905225347,4pubsub_TSN_loop1870469-21kworker/u8:4+flush-8:000:30:243
1547328995345,4cyclictest262-21systemd-journal22:44:480
1547328995345,4cyclictest262-21systemd-journal00:26:380
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

Valid XHTML 1.0 Transitional