[Bug 1861875] Re: VDE networking barely working

[Maarten]

** Description changed:

  Running qemu with a vde_switch and slirpvde:
  
    vde_switch -F -sock /tmp/qemu_vde_switch -M /tmp/qemu_vde_mgmt
    slirpvde -s /tmp/qemu_vde_switch -dhcp
-   qemu-system-x86_64 -m 2048 -smp 2 -serial mon:stdio -display none 
-     -vga none -nodefaults -accel hax
-     -net nic,macaddr=52:54:00:0e:e0:61,model=virtio
-     -net vde,sock=/tmp/qemu_vde_switch -device virtio-rng-pci
-     -drive file=worker.qcow2,if=virtio
-     -drive file=cloud-init.iso,format=raw,if=virtio
+   qemu-system-x86_64 -m 2048 -smp 2 -serial mon:stdio -display none -vga none 
-nodefaults -accel hax -net nic,macaddr=52:54:00:0e:e0:61,model=virtio -net 
vde,sock=/tmp/qemu_vde_switch -device virtio-rng-pci -drive 
file=worker.qcow2,if=virtio -drive file=cloud-init.iso,format=raw,if=virtio
  
  There is some network connectivity, ping and curl work, but bigger
- transfers like apt-get update break with the following errors printed in
- the output of vde_switch:
+ transfers like apt-get update or iperf break with the following errors
+ printed in the output of vde_switch:
  
    vde_switch: send_sockaddr port 2: No buffer space available
    vde_switch: send_sockaddr port 2: No buffer space available
    vde_switch: send_sockaddr port 2: No buffer space available
  
  I've tried to change the MTU size and model of the adapter inside of the
  VM, but nothing worked.
  
  OS: macOS 10.15.2
  qemu: 4.2.0
  vde2 (vde_switch / slirpvde): 2.3.2

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https://bugs.launchpad.net/bugs/1861875

Title:
  VDE networking barely working

Status in QEMU:
  New

Bug description:
  Running qemu with a vde_switch and slirpvde:

    vde_switch -F -sock /tmp/qemu_vde_switch -M /tmp/qemu_vde_mgmt
    slirpvde -s /tmp/qemu_vde_switch -dhcp
    qemu-system-x86_64 -m 2048 -smp 2 -serial mon:stdio -display none -vga none 
-nodefaults -accel hax -net nic,macaddr=52:54:00:0e:e0:61,model=virtio -net 
vde,sock=/tmp/qemu_vde_switch -device virtio-rng-pci -drive 
file=worker.qcow2,if=virtio -drive file=cloud-init.iso,format=raw,if=virtio

  There is some network connectivity, ping and curl work, but bigger
  transfers like apt-get update or iperf break with the following errors
  printed in the output of vde_switch:

    vde_switch: send_sockaddr port 2: No buffer space available
    vde_switch: send_sockaddr port 2: No buffer space available
    vde_switch: send_sockaddr port 2: No buffer space available

  I've tried to change the MTU size and model of the adapter inside of
  the VM, but nothing worked.

  OS: macOS 10.15.2
  qemu: 4.2.0
  vde2 (vde_switch / slirpvde): 2.3.2

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