Slower download than upload on PVE host and VMs

[jackyaz]

New Proxmox user. I've noticed something odd where I get lower download than upload on both internet speedtests and iperf3 tests on the LAN. For example, download is typically 850Mbps while upload is 930Mbps.

Not sure where to start troubleshooting!

 

[Moayad]

Hi,

Please post the network config of your Proxmox VE `cat /etc/network/interfaces` and the VM config `qm config <VMID>`.

 

[jackyaz]

Here you go!

cat /etc/network/interfaces
# network interface settings; autogenerated
# Please do NOT modify this file directly, unless you know what
# you're doing.
#
# If you want to manage parts of the network configuration manually,
# please utilize the 'source' or 'source-directory' directives to do
# so.
# PVE will preserve these directives, but will NOT read its network
# configuration from sourced files, so do not attempt to move any of
# the PVE managed interfaces into external files!

auto lo
iface lo inet loopback

iface eno2 inet manual

auto vmbr0
iface vmbr0 inet static
    address 10.14.16.89/24
    gateway 10.14.16.1
    bridge-ports eno2
    bridge-stp off
    bridge-fd 0
    bridge-vlan-aware yes
    bridge-vids 2-4094

source /etc/network/interfaces.d/*

qm config 107
agent: 1
balloon: 2048
bios: ovmf
boot: order=scsi0
cores: 4
cpu: host
cpuunits: 2000
efidisk0: Data:vm-107-disk-0,efitype=4m,pre-enrolled-keys=1,size=1M
hostpci0: 0000:00:02.5,pcie=1,x-vga=1
machine: pc-q35-9.0
memory: 4096
meta: creation-qemu=9.0.2,ctime=1730145691
name: AppServer
net0: virtio=BC:24:11:32:1C:6E,bridge=vmbr0,firewall=1,queues=4
numa: 0
onboot: 1
ostype: l26
scsi0: Data:vm-107-disk-1,cache=writethrough,discard=on,iothread=1,size=50G,ssd=1
scsihw: virtio-scsi-single
smbios1: uuid=3a79e874-a1ad-4020-887e-99ba2cfa2f12
sockets: 1
startup: order=7
tpmstate0: Data:vm-107-disk-2,size=4M,version=v2.0
vga: none
vmgenid: 3aff9cad-6400-4e79-a529-3705c6f73684