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2021-07-26 - 19:01

Pentium 75 - 200, Linux 4.18.7-rt5 (Profile)

Latency plot of system in rack #3, slot #5
Data to construct the above plot have been generated using the RT test utility cyclictest.
Command line: cyclictest -l25000000 -m -n -a0 -t1 -p99 -i800 -h1000 -q
Total number of samples: 25 million
Resolution of latency scale: reduced 
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rack3slot5.osadl.org (updated Mon Jul 26, 2021 12:44:23)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
174289941028,0cyclictest1155-21jbd2/sda1-809:10:160
174289940984,0cyclictest20000-21ssh11:47:470
174289940437,0cyclictest24532-21ntp_offset12:06:300
174289939584,0cyclictest2266-21syslogd07:20:020
174289939232,0cyclictest12885-21munin-node09:16:160
174289938831,0cyclictest2440-21ntpd11:11:520
174289938529,0cyclictest30490-21mailstats12:30:250
174289938327,0cyclictest29634-21kworker/u2:207:50:110
174289938129,0cyclictest2659-21ssh10:41:470
174289937742,0cyclictest25511-21latency_hist12:10:150
174289937740,0cyclictest1155-21jbd2/sda1-808:00:140
174289937636,0cyclictest21642-21irqstats07:30:220
174289937533,0cyclictest17874-21latency_hist09:35:160
174289937532,0cyclictest15953-21timerandwakeup09:27:120
174289937531,0cyclictest2457-21cron07:26:030
174289937529,0cyclictest14188-21ssh11:26:240
174289937431,0cyclictest14120-21diskmemload09:20:570
174289937332,0cyclictest2440-21ntpd10:54:470
174289937128,0cyclictest1155-21jbd2/sda1-810:40:180
174289937069,0cyclictest12064-1kworker/u3:211:32:080
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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