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[Satish Patel <satish.txt@xxxxxxxxx>]

Public bug reported:

We are running openstack and hypervisor is qemu-kvm and noticed during
peak 50% packet loss on tap interface of instance.

I have found in google increase txqueue will solve this issue but in my
case after increase to 10000 i am still seeing same issue.

I have 32 core compute node and i didn't reserve any CPU core for
hypervisor and i am running 2 vm instance with 15 vCPU core to each.

OS: centos7.5 
Kernel: 3.10.0-862.11.6.el7.x86_64

[root@ostack-compute-33 ~]# ifconfig tap5af7f525-5f | grep -i drop
        RX errors 0  dropped 0  overruns 0  frame 0
        TX errors 0  dropped 2528788837 overruns 0  carrier 0  collisions 0

what else i should try?

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1792763

Title:
  tap TX packet drops during high cpu load

Status in OpenStack Compute (nova):
  New

Bug description:
  We are running openstack and hypervisor is qemu-kvm and noticed during
  peak 50% packet loss on tap interface of instance.

  I have found in google increase txqueue will solve this issue but in
  my case after increase to 10000 i am still seeing same issue.

  I have 32 core compute node and i didn't reserve any CPU core for
  hypervisor and i am running 2 vm instance with 15 vCPU core to each.

  OS: centos7.5 
  Kernel: 3.10.0-862.11.6.el7.x86_64

  [root@ostack-compute-33 ~]# ifconfig tap5af7f525-5f | grep -i drop
          RX errors 0  dropped 0  overruns 0  frame 0
          TX errors 0  dropped 2528788837 overruns 0  carrier 0  collisions 0

  what else i should try?

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