On Mon, May 30, 2016 at 04:17:52PM +0800, Herbert Xu wrote:
> > Commit 412ca1550cbecb2c ("macvlan: Move broadcasts into a work queue")
> > moved processing of all macvlan multicasts into a work queue. This
> > causes a noticable performance regression when there is heavy multicast
> > traffic on the underlying interface for multicast groups that the
> > macvlan subinterfaces are not members of, in which case we end up
> > cloning all those packets and then freeing them again from a work queue
> > without really doing any useful work with them in between.
>
> OK so your motivation is to get rid of the unnecessary memory
> allocation, right?
That and stack switches to kworker threads and serialisation on
the bc_queue queue lock.
