请教bonding mode=0之速度异常问题？

cnchin

用intel 8492 dual port gigabit网卡作了bonding，分别设了mode=0 和 mode=1，mode=1模式下传输速度接近990Mbps/S，failover功能正常。
但是在mode=0模式下，按理应该是twice gigabit的速度，实测下来只有94Mbps/S，相当于百兆的速度，为何？
网线是直连的，没有通过交换机。
设置如下：
[mode=1]下：
# cat /proc/net/bond0/info
Bonding Mode: fault-tolerance (active-backup)
Currently Active Slave: eth1
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0
Multicast Mode: all slaves

Slave Interface: eth2
MII Status: up
Link Failure Count: 0

Slave Interface: eth1
MII Status: up
Link Failure Count: 0
==================
[mode=0]下：
#  cat /proc/net/bond0/info
Bonding Mode: load balancing (round-robin)
MII Status: down
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0
Multicast Mode: all slaves

Slave Interface: eth2
MII Status: down
Link Failure Count: 3

Slave Interface: eth1
MII Status: down
Link Failure Count: 3

cnchin

补充一个问题：
在ifcfg-bond0设置MTU=9000后：
# ifup bond0
SIOCSIFMTU: Invalid argument
是否不能设jambo frame？

河里的鱼

请先说明一下0是做什么用的?

cnchin

０模式么就是负载均衡，有什么问题?

JohnBull

It sounds like your linux kernel did not get the proper infomation about your slave interfaces.
See kernel source:  drivers/net/bonding/bond_main.c

...
/*
* Get link speed and duplex from the slave's base driver
* using ethtool. If for some reason the call fails or the
* values are invalid, fake speed and duplex to 100/Full
* and return error.
*/
static int bond_update_speed_duplex(struct slave *slave)
....

Maybe your NIC is not 100% ethtool compatible.