[Click] Click and e1000e

[Roman Chertov]

> 
> Unless I've miss understood click's threading model, a single poll
> device element with multiple outputs can only be assigned to one
> thread and hence once cpu. To be able to poll a 10G interface at line

The polling device is attached to a thread and then it generates tasks. 
  While executing a task, passive elements are executed until a queue is 
encountered or the packet is dropped.  Note, the elements that are the 
task chain will execute on the CPU on which the task is scheduled.  So I 
don't think that having multiple polling outputs is in violation of the 
threading model.  Please correct me if I am wrong.

> rate you need to assign between 3 and 4 cpus to the device, hence the
> need for multiple elements. A single core of a 2.6Ghz Xeon can only
> poll about 2.8 Mp/s .

I think for a 10GE card this might be a good approach (provided the 
PCI-E bus does not become a bottleneck).  However, for e1000e and igb 
drivers I think it will result in too many wasted cycles.

Roman

> 
> Adam
>