Hi all,

I've got two gigabit ethernet interfaces bonded in CentOS 5.6. I've set "miimode=1000" and I've tried "mode=" 0, 4 and 6. I've not been able to get better than 112MB/sec, which is the same as the non-bonded interfaces.

My config files are:

=== cat /etc/sysconfig/network-scripts/ifcfg-{eth1,eth2,bond0} # SN1 HWADDR=00:30:48:fd:26:71 DEVICE=eth1 BOOTPROTO=none MASTER=bond0 SLAVE=yes

# SN2 HWADDR=00:1B:21:87:80:CE DEVICE=eth2 BOOTPROTO=none MASTER=bond0 SLAVE=yes

# Bonded interfaces for Storage Network DEVICE=bond0 IPADDR=192.168.21.80 NETMASK=255.255.255.0 ONBOOT=yes BOOTPROTO=none USERCTL=no BONDING_OPTS="miimon=1000 mode=0" ===

I'm running benchmarks using iperf (.90 is the second machine with a matching bonded connection):

=== iperf -f M -c 192.168.21.90 ------------------------------------------------------------ Client connecting to 192.168.21.90, TCP port 5001 TCP window size: 0.02 MByte (default) ------------------------------------------------------------ [ 3] local 192.168.21.80 port 35728 connected with 192.168.21.90 port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 1086 MBytes 109 MBytes/sec ===

This is the speed a non-bonded interface:

=== iperf -f M -c 192.168.22.90 ------------------------------------------------------------ Client connecting to 192.168.22.90, TCP port 5001 TCP window size: 0.02 MByte (default) ------------------------------------------------------------ [ 3] local 192.168.22.80 port 57475 connected with 192.168.22.90 port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 1125 MBytes 112 MBytes/sec ===

The switch is a D-Link DGS-3100, which is a managed switch that I believe is capable of 801.3ad (for mode=4).

Any advice?