Description:

I have an older Docker container that is still limited to 1 Gbps network speed, even though my server’s bandwidth has been upgraded to 10 Gbps. When I create a new Docker container using the host network mode, it can utilize the full 10 Gbps speed without any issues. However, when I switch the old container to host network mode, it remains limited to 1 Gbps.

Steps I’ve Tried So Far:

1. Changed the network mode of the old container to host, but it still remains limited to 1 Gbps.
2. Verified that there are no tc (traffic control) limits set on the network interfaces.
3. Ensured that the old container and new container are running on the same server, and the new container can achieve 10 Gbps speed using host network mode.

Environment:
Server OS: Debian
Docker version: Latest stable
Old Container Image: linuxserver/qbittorrent
Docker Compose Configuration for the Old Container:

Docker Compose Configuration for the Old Container:

version: '3.3'
services:
    qbittorrent:
        image: 'linuxserver/qbittorrent:latest'
        container_name: qbittorrent
        restart: always
        hostname: qbittorrent
        volumes:
            - '/root/MoviePilot/qbittorrent/config:/config'
            - '/hdd/media/download:/media/download'
        tmpfs:
            - '/tmp'
        environment:
            - 'PUID=0'
            - 'PGID=0'
        ports:
            - target: 8080
              published: 8080
              protocol: tcp
            - target: 49678
              published: 49678
              protocol: tcp
            - target: 49678
              published: 49678
              protocol: udp
        network_mode: bridge

Docker Compose Configuration for the New Container:

services:
    qbittorrent:
        image: 'linuxserver/qbittorrent:latest'
        container_name: qbittorrent-2
        restart: always
        hostname: qbittorrent-2
        environment:
          - PUID=0
          - PGID=0
          - TZ=Etc/UTC
          - WEBUI_PORT=8081
          - TORRENTING_PORT=29333
        volumes:
            - '/root/MoviePilot/qbittorrent-2/config:/config' # 目录已提前创建好
            - '/hdd/media/download:/media/download' # 目录已提前创建
        ports:
          - 8081:8081
          - 29333:29333
          - 29333:29333/udp
        network_mode: host       

docker network inspect bridge

[
    {
        "Name": "bridge",
        "Id": "3b87d51e9ab54683b93fd470eeac0577137a3f12b106f33ea5edb7146d66c8d2",
        "Created": "2024-06-13T18:00:42.375704167+02:00",
        "Scope": "local",
        "Driver": "bridge",
        "EnableIPv6": true,
        "IPAM": {
            "Driver": "default",
            "Options": null,
            "Config": [
                {
                    "Subnet": "172.17.0.0/16",
                    "Gateway": "172.17.0.1"
                },
                {
                    "Subnet": "fd00:dead:beef:c0::/80",
                    "Gateway": "fd00:dead:beef:c0::1"
                }
            ]
        },
        "Internal": false,
        "Attachable": false,
        "Ingress": false,
        "ConfigFrom": {
            "Network": ""
        },
        "ConfigOnly": false,
        "Containers": {
            hid
        },
        "Options": {
            "com.docker.network.bridge.default_bridge": "true",
            "com.docker.network.bridge.enable_icc": "true",
            "com.docker.network.bridge.enable_ip_masquerade": "true",
            "com.docker.network.bridge.host_binding_ipv4": "0.0.0.0",
            "com.docker.network.bridge.name": "docker0",
            "com.docker.network.driver.mtu": "1500"
        },
        "Labels": {}
    }
]

docker container tc

root@qbittorrent:/# tc qdisc show dev eth0
qdisc noqueue 0: root refcnt 2

QS:
Despite switching the old container to host network mode, it still only achieves 1 Gbps speed. In contrast, a new container using the same host network mode can reach 10 Gbps.

What could be causing this limitation on the older container, and how can I ensure it utilizes the full 10 Gbps bandwidth?

Any suggestions or guidance would be greatly appreciated!

Thank you!