Public bug reported:
ICMP response flapping detected when CPU is high utilization in a quest
system.
It is log ICMP response. 54916 - PID of guest OS.
# while true ; do pidstat -p 54916 1 1 | grep -v -e Linux -e Average; ping -c1
10.11.110.213 | grep ttl=64; done
05:06:19 PM UID PID %usr %system %guest %CPU CPU Command
05:06:20 PM 109 54916 0.00 18.00 25.00 30.00 5
qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.939 ms
05:06:20 PM UID PID %usr %system %guest %CPU CPU Command
05:06:21 PM 109 54916 0.00 72.00 31.00 72.00 5
qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.166 ms
05:06:21 PM UID PID %usr %system %guest %CPU CPU Command
05:06:22 PM 109 54916 47.00 55.00 6.00 108.00 0
qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.086 ms
05:06:22 PM UID PID %usr %system %guest %CPU CPU Command
05:06:23 PM 109 54916 0.00 149.00 3.00 149.00 0
qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=3406 ms
05:06:27 PM UID PID %usr %system %guest %CPU CPU Command
05:06:28 PM 109 54916 50.00 0.00 86.00 136.00 0
qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.312 ms
05:06:28 PM UID PID %usr %system %guest %CPU CPU Command
05:06:29 PM 109 54916 0.00 0.00 43.00 22.00 0
qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.338 ms
05:06:29 PM UID PID %usr %system %guest %CPU CPU Command
05:06:30 PM 109 54916 0.00 0.00 32.00 16.00 0
qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.134 ms
05:06:30 PM UID PID %usr %system %guest %CPU CPU Command
05:06:31 PM 109 54916 0.00 26.00 43.00 47.00 0
qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.296 ms
05:06:31 PM UID PID %usr %system %guest %CPU CPU Command
05:06:32 PM 109 54916 61.00 0.00 70.00 131.00 5
qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.139 ms
05:06:32 PM UID PID %usr %system %guest %CPU CPU Command
05:06:33 PM 109 54916 0.00 102.00 28.00 102.00 5
qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.153 ms
05:06:33 PM UID PID %usr %system %guest %CPU CPU Command
05:06:34 PM 109 54916 24.00 49.00 0.00 73.00 6
qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=3205 ms
05:06:37 PM UID PID %usr %system %guest %CPU CPU Command
05:06:38 PM 109 54916 0.00 0.00 148.00 123.00 7
qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.097 ms
05:06:38 PM UID PID %usr %system %guest %CPU CPU Command
05:06:39 PM 109 54916 0.00 23.00 55.00 52.00 0
qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.323 ms
05:06:39 PM UID PID %usr %system %guest %CPU CPU Command
05:06:40 PM 109 54916 50.00 52.00 3.00 105.00 0
qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=4260 ms
05:06:44 PM UID PID %usr %system %guest %CPU CPU Command
05:06:45 PM 109 54916 0.00 54.00 85.00 96.00 12
qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.306 ms
05:06:45 PM UID PID %usr %system %guest %CPU CPU Command
05:06:46 PM 109 54916 0.00 38.00 71.00 74.00 7
qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.143 ms
05:06:46 PM UID PID %usr %system %guest %CPU CPU Command
05:06:47 PM 109 54916 60.00 0.00 78.00 138.00 11
qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.188 ms
05:06:47 PM UID PID %usr %system %guest %CPU CPU Command
05:06:48 PM 109 54916 0.00 0.00 78.00 42.00 11
qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.140 ms
05:06:48 PM UID PID %usr %system %guest %CPU CPU Command
05:06:49 PM 109 54916 0.00 14.00 44.00 37.00 11
qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.234 ms
05:06:49 PM UID PID %usr %system %guest %CPU CPU Command
05:06:50 PM 109 54916 0.00 4.00 4.00 5.00 11
qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.185 ms
05:06:50 PM UID PID %usr %system %guest %CPU CPU Command
05:06:51 PM 109 54916 0.00 1.00 1.00 2.00 11
qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.274 ms
^C64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.144 ms
05:06:52 PM UID PID %usr %system %guest %CPU CPU Command
05:06:53 PM 109 54916 81.00 0.00 38.00 119.00 7
qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.102 ms
** Affects: qemu-kvm (Ubuntu)
Importance: Undecided
Status: New
** Tags: virtualization
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https://bugs.launchpad.net/bugs/1347684
Title:
icmp response flapping during CPU load
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