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[Oleg Bondarev <obondarev@xxxxxxxxxxxx>]

Public bug reported:


version: Pike, DVR enabled, 28 compute nodes
scenario: spawn 140 VMs concurrently, with pre-created neutron ports
issue: on some compute nodes VMs cannot get IP address, no reply on dhcp broadcasts. All new VMs spawned on the same compute node in the same network have this problem.

it appears that flood table on compute nodes with issue is missing
outputs to dhcp nodes:

 cookie=0x679aebcfbb8dc9a2, duration=296.991s, table=22, n_packets=2,
n_bytes=220, priority=1,dl_vlan=4
actions=strip_vlan,load:0x14->NXM_NX_TUN_ID[],output:"vxlan-
ac1ef47a",output:"vxlan-ac1ef480",output:"vxlan-ac1ef46d",output:"vxlan-
ac1ef477",...

** Affects: neutron
     Importance: High
     Assignee: Oleg Bondarev (obondarev)
         Status: Confirmed


** Tags: l2-pop l3-dvr-backlog

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https://bugs.launchpad.net/bugs/1789846

Title:
  l2_pop flows missing when spawning VMs at a high rate

Status in neutron:
  Confirmed

Bug description:
  
  version: Pike, DVR enabled, 28 compute nodes
  scenario: spawn 140 VMs concurrently, with pre-created neutron ports
  issue: on some compute nodes VMs cannot get IP address, no reply on dhcp broadcasts. All new VMs spawned on the same compute node in the same network have this problem.

  it appears that flood table on compute nodes with issue is missing
  outputs to dhcp nodes:

   cookie=0x679aebcfbb8dc9a2, duration=296.991s, table=22, n_packets=2,
  n_bytes=220, priority=1,dl_vlan=4
  actions=strip_vlan,load:0x14->NXM_NX_TUN_ID[],output:"vxlan-
  ac1ef47a",output:"vxlan-ac1ef480",output:"vxlan-ac1ef46d",output
  :"vxlan-ac1ef477",...

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