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txqueuelen in /etc/conf.d/net?
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dufeu
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PostPosted: Sun Aug 25, 2019 12:17 pm    Post subject: txqueuelen in /etc/conf.d/net? Reply with quote

I'm finally re-visiting my 10G nic configurations in my server and workstation.

Each PC has a Mellanox 10G card connected to SPF+ ports on a switch in the same rack.

I currently have the following configuration to support my usage and faster speed:
  • Custom sysctl.conf settings
    /etc/sysctl.conf:
    #       net.core.rmem_max = 212992  # as initialized by kernel
    #       net.core.wmem_max = 212992  # as initialized by kernel
    #       -->     for 10G nics - use 16MB, 32MB for long end to end 10G paths
    #               in addition, use ifconfig (or similar) to increase txqueulen for 10G nics.
    #               set this in equivalent to /etc/rclocal
    #                       ifconfig $NIC txqeuelen 10000
    #                       ip link set $NIC txqueuelen 10000
    net.core.rmem_max = 16777216
    net.core.wmem_max = 16777216

  • Custom /etc/conf.d/net configuration. Note that I support up to 3 VMs as normal members of my local LAN.
    /etc/conf.d/net:
    #       single physical nic bridged configuration - intended
    #       for vm hosts - in this configuration, we want to support
    #       transparent access between vm clients and other devices
    #       on the LAN - assumes vm clients are similarly trusted
    #               eth0 =  motherboard buil-in 1G nic - leave down
    #               eth1 =  melonix 10G add-on nic - in use
    #
    #               set all physical nics to be not needed/required
    #               for network connected services - we'll be using
    #               'br0' instead
    #
    rc_net_lo_provide="!net"
    rc_net_eth0_provide="!net"
    rc_net_eth1_provide="!net"
    config_eth0=null
    config_eth1=null
    #
    #       tun/tap - like eth# above - null defined to avoid DHCP
    #               tap# =  need 1 for each concurrent guest session
    #                       remaining lines assume single vm session
    #       each 'tap#' represents 1 vm session - tap# assignment is done
    #       through QEMU invocation using '-net' or '-netdev'
    #
    #       your installation may mot have /dev/net installed or, it
    #       may not have the special mode /dev/net/tun file - it only
    #       needs to be created 1 time (from 'root' or sudo):
    #               mkdir /dev/net ; mknod /dev/net/tun c 10 200
    #
    tuntap_tap0="tap"
    tuntap_tap1="tap"
    tuntap_tap2="tap"
    config_tap0=null
    config_tap1=null
    config_tap2=null
    #
    #               set bridge address - 'eth1' will service the bridge
    #
    rc_net_br0_need="net.eth1 net.tap0 net.tap1 net.tap2""
    config_br0="192.168.1.200/24"
    routes_br0="default via 192.168.1.1"


Can I add 'txqueuelen' to /etc/conf./net? If so, do I add it just to 'br0' or to both 'br0' and 'eth1'?

If I can't add txqueuelen to /etc/conf.d/net, should I add 'ip link set br0 txqueuelen 10000' to /etc/rc.conf? Again, if I add the command for 'br0' to /etc/rc.conf, do I also need to add a command for 'eth1'?
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Gatak
Tux's lil' helper
Tux's lil' helper


Joined: 04 Jan 2004
Posts: 123

PostPosted: Wed Sep 18, 2019 6:42 pm    Post subject: Reply with quote

You would set it in /etc/conf.d/net using

Code:
txqueuelen_eth0="10000"


But really, isn't 10000 packets a lot? Perhaps look into if byte queue limits can be more useful for your application instead?
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