On Tue, Sep 25, 2007 at 07:57:02AM -0700, Garrett D'Amore wrote: > One might imagine that soft LSO works differently. Imagine soft-lso as a > subroutine, which, given a large TCP segment, and the MTU size, builds a > series of header mblks, and maps the data segment in one operation (perhaps > making use of multiple DMA cookies, etc. to deal with page boundaries, > etc.) giving the appearance of LSO to the upper layers, while allowing a > NIC that only has the simple ability to use more than 1 descriptor per > ethernet frame to use a single DMA setup operation.
The approach you describe would require that a mac driver be updated to support it. That would be bad. Keeping things in the common layer is good. dme.
