On Sat, Jul 16, 2011 at 9:04 PM, jiangtao.jit <jiangtao.jit@gmail.com> wrote:

Hi, all

recently, i read some of the Kernel codes

and i noticed that a bridge and lo device have only one queue when allocated

but a bonding device can have multi queues

they are all virtual devices

why they can have diffrent queue numbers

it confused me a lot

i would really appreciate if someone could give me some guidelines

thanks very much

what is the purpose of a "queue"? reading the documentation:

http://www.kernel.org/doc/Documentation/networking/bonding.txt

each queue correspond to each physical interface "ethX". and as all these "slave" interfaces share the same MAC address, packets can be sent out through any of these interface and received via another - allowing redundancies in terms of physical links. multiple interfaces in the same multi-queue all share the same MAC address.

but the case of bridging is not really for load balancing purposes. "bridge" literally means bridging two different physical interface, so that network traffic can hop from one to the other (independent or ignorant of L3 protocol). each physical interface must have different MAC address, so that each "queue" is actually ONE interface.

See:

http://www.youtube.com/watch?v=luOFxh1awiA&feature=related

2011-07-16

jiangtao.jit

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