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2019-07-22 - 07:35

0, Linux 4.18.5-rt3 (Profile)

Latency plot of system in rack #a, slot #3
Data to construct the above plot have been generated using the RT test utility cyclictest.
Command line: cyclictest -l100000000 -m -Sp99 -i200 -h400 -q
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
The worst-case latency is about 3.09 times higher under extreme CPU load.
Results of all systems under extreme CPU load are combined on this summary graph.
Characteristics of the 20 highest latencies:
System rackaslot3 (updated Mon Jul 22, 2019 00:43:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
381260,0rcuc/325888-21taskset23:16:363
32548992318,0cyclictest15065-21scp23:50:336
32548992318,0cyclictest0-21swapper/623:34:176
102450230,0irq/32-eth0-TxR0-21swapper/322:45:203
102450230,0irq/32-eth0-TxR0-21swapper/322:30:233
32548992219,0cyclictest32589-21sed21:30:176
32548992219,0cyclictest27945-21sshd00:11:556
32548992218,0cyclictest32545-21/usr/sbin/munin20:20:206
32548992212,0cyclictest0-21swapper/600:04:386
102450220,0irq/32-eth0-TxR0-21swapper/323:05:223
102450220,0irq/32-eth0-TxR0-21swapper/322:55:203
101750220,0irq/31-eth0-TxR0-21swapper/223:45:202
101650220,0irq/30-eth0-TxR6181-21sshd23:36:001
101650220,0irq/30-eth0-TxR0-21swapper/123:30:201
101650220,0irq/30-eth0-TxR0-21swapper/122:35:141
32548992116,0cyclictest7432-21sshd22:48:236
101750210,0irq/31-eth0-TxR30673-21dns-resolver00:15:532
101750210,0irq/31-eth0-TxR30673-21dns-resolver00:15:532
101750210,0irq/31-eth0-TxR0-21swapper/223:33:482
101750210,0irq/31-eth0-TxR0-21swapper/223:15:392
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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