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I set up NIC bonding on my debian 8 machine as a test, and I ran into the following problem.
Without bonding I get ~90MB/s write and ~100MB/s read. After I enabled bonding the write speed dropped to around 30-35 MB/s, but reading is still around 90MB/s.

Content of my /etc/network/interfaces:

auto bond0
        iface bond0 inet static
        address 192.168.1.2
        netmask 255.255.255.0
        network 192.168.1.0
        broadcast 192.168.1.255
        gateway 192.168.1.1
        dns-nameservers 192.168.1.2 8.8.8.8
        dns-domain dev
        bond-mode 0
        bond-miimon 100
        bond-slaves eth0 eth1
        bond-updelay 200
        bond-downdelay 200
        mtu 7152

The server is connected to a 16 port TP-Link Gbit Switch.
I switched the cables and used another switch, but the problem persists

Tested bond-modes:
Mode 0 - read 90MB/s write 30MB/s
Mode 1 - read 100MB/s write 90MB/s
Mode 5 - read 50MB/s write 90MB/s
Mode 6 - read 90MB/s write 80MB/s

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  • read-write operations are typically associated with disk IO and/or protocols such as iSCSI, NFS and SMB (and the disk might be the limiting factor) and for networking the jargon is mostly send/transmit and receive, so the question is what are you testing and how do you achieve those results?
    – HBruijn
    Sep 27, 2015 at 19:36
  • I am testing the sending and transmiting rates on my server, without bonding send/transmit was like stated above. The read an write operations are done on a ssd. I got my results by using ftp and samba to copy a 5GB file from and to the server.
    – Octfx
    Sep 27, 2015 at 19:58
  • Are you configuring the switch appropriately for the selected bonding modes? See section 12 of kernel.org/doc/Documentation/networking/bonding.txt
    – Brandon Xavier
    Sep 28, 2015 at 4:34

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