[Bug 1347684] [NEW] icmp response flapping during CPU load

AlexanderYT 1347684 at bugs.launchpad.net
Wed Jul 23 13:18:13 UTC 2014 

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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