Paul Durrant wrote:
> On 25/09/2007, David Edmondson <dme at sun.com> wrote:
>
>> Why? I can accept a large packet in a MAC layer transmit function,
>> chop it up and then present an mblk chain to the driver in a single
>> call to its' transmit routine.
>>
>>
>
> You lose the single DMA map this way, which is a good portion of the
> advantage of LSO (given how slow the DMA map operation appears to be
> on many platforms).
>
Right. If you push it too far up the stack, then it offers no real
advantage over just letting IP fragment the frames normally. :-)
The meaty part of this work can be in common code that is called by mac
layer drivers, though.
-- Garrett
> Paul
>
>
