in_broadcast() called for almost every packet in ip_output()

[Ryan Stone]

On Wed, Jul 20, 2016 at 3:22 PM, Andrew Gallatin <gallatin at netflix.com>
wrote:

> Caching sounds reasonable, but.. won't the lock still add overhead
> to paths like unconnected udp and packet forwarding?
>

Forwarded packets will never be broadcast, so checking for a broadcast
address would just be redundant.  Unconnected UDP would get overhead, but
I'm honestly not sure how many people care about the performance of
unconnected UDP.