Re: Re: problem with queue numbers between bridge, bonding and lo devices

[jiangtao.jit]

Peter:

Thank you for your guide
these info is really helpful for me 
i'll trying to learn more about networking


2011-07-19 
jiangtao.jit 

发件人： Peter Teoh 
发送时间： 2011-07-19  07:37:18 
收件人： jiangtao.jit 
抄送： kernelnewbies 
主题： Re: problem with queue numbers between bridge, bonding and lo devices 
 



On Sat, Jul 16, 2011 at 9:04 PM, jiangtao.jit <jiangtao.jit at 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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-- 
Regards,
Peter Teoh