Slow network since proxmox kernel upgrade to 4.15

Discussion in 'Proxmox VE: Networking and Firewall' started by nila, Oct 9, 2018.

  1. nila

    nila New Member

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    Hello fellow proxmox users / devs,

    I recently upgraded to proxmox 5.2 (Which pushed the kernel version to 4.15) and faced a major slowdown on my network interfaces (on the host).

    Instead of Gigabit(~110MB/s) I managed peaks of up to 6MB/s. I tried reconfiguring the cisco router, I swapped out every cable and even checked it by bridging the upgraded server via my other server (which was / is on kernel version 4.13)

    I noticed that there is no issue with networking as long as the destination / source is in a subnet the server has in its own routing table (ip route).

    As soon as it leaves that area, speed drops down to 6MB/s.

    After 2 hours of testing I then tried downgrading the kernel and proxmox-ve which resolved the issue.

    My server is using Broadcom eXtreme network cards (Driver bnx2x).

    I found a few forum entries related to this issue, which I am not allowed to post due forum restrictions.

    I will try out the proposed fix "sudo sysctl net.ipv4.tcp_congestion_control=cubic" this evening on a different server.

    The same issue also appeared on my hetzner OOB server which was also successfully repaired by downgrading the kernel.

    Anyone else faced the same issue (or similar)
     
  2. tom

    tom Proxmox Staff Member
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    pls always include your:

    > pveversion -v
     
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  3. nila

    nila New Member

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    pveversion -v of the machines that had slow network:

    proxmox-ve: 5.2-2 (running kernel: 4.15.17-1-pve)
    pve-manager: 5.2-1 (running version: 5.2-1/0fcd7879)
    pve-kernel-4.15: 5.2-1
    pve-kernel-4.15.17-1-pve: 4.15.17-9
    corosync: 2.4.2-pve5
    criu: 2.11.1-1~bpo90
    glusterfs-client: 3.8.8-1
    ksm-control-daemon: 1.2-2
    libjs-extjs: 6.0.1-2
    libpve-access-control: 5.0-8
    libpve-apiclient-perl: 2.0-4
    libpve-common-perl: 5.0-31
    libpve-guest-common-perl: 2.0-16
    libpve-http-server-perl: 2.0-8
    libpve-storage-perl: 5.0-23
    libqb0: 1.0.1-1
    lvm2: 2.02.168-pve6
    lxc-pve: 3.0.0-3
    lxcfs: 3.0.0-1
    novnc-pve: 0.6-4
    proxmox-widget-toolkit: 1.0-18
    pve-cluster: 5.0-27
    pve-container: 2.0-23
    pve-docs: 5.2-3
    pve-firewall: 3.0-8
    pve-firmware: 2.0-4
    pve-ha-manager: 2.0-5
    pve-i18n: 1.0-5
    pve-libspice-server1: 0.12.8-3
    pve-qemu-kvm: 2.11.1-5
    pve-xtermjs: 1.0-5
    qemu-server: 5.0-26
    smartmontools: 6.5+svn4324-1
    spiceterm: 3.0-5
    vncterm: 1.5-3
    zfsutils-linux: 0.7.8-pve1~bpo9

    proxmox-ve: 5.1-28 (running kernel: 4.13.8-2-pve)
    pve-manager: 5.2-9 (running version: 5.2-9/4b30e8f9)
    pve-kernel-4.13.8-2-pve: 4.13.8-28
    corosync: 2.4.2-pve5
    criu: 2.11.1-1~bpo90
    glusterfs-client: 3.8.8-1
    ksm-control-daemon: 1.2-2
    libjs-extjs: 6.0.1-2
    libpve-access-control: 5.0-8
    libpve-apiclient-perl: 2.0-5
    libpve-common-perl: 5.0-40
    libpve-guest-common-perl: 2.0-18
    libpve-http-server-perl: 2.0-11
    libpve-storage-perl: 5.0-29
    libqb0: 1.0.1-1
    lvm2: 2.02.168-pve6
    lxc-pve: 3.0.2+pve1-2
    lxcfs: 3.0.2-2
    novnc-pve: 1.0.0-2
    proxmox-widget-toolkit: 1.0-20
    pve-cluster: 5.0-30
    pve-container: 2.0-27
    pve-docs: 5.2-8
    pve-firewall: 3.0-14
    pve-firmware: 2.0-5
    pve-ha-manager: 2.0-5
    pve-i18n: 1.0-6
    pve-libspice-server1: 0.12.8-3
    pve-qemu-kvm: 2.11.2-1
    pve-xtermjs: 1.0-5
    qemu-server: 5.0-36
    smartmontools: 6.5+svn4324-1
    spiceterm: 3.0-5
    vncterm: 1.5-3
    zfsutils-linux: 0.7.11-pve1~bpo1

    Sorry for not including in the first place
     
  4. tom

    tom Proxmox Staff Member
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