m_pkthdr.rcvif dangling pointer problem

[Ryan Stone]

On Sun, Jul 17, 2011 at 7:59 AM, Vadim Goncharov <vadim_nuclight at mail.ru> wrote:
> Ways to improve are to be found from this starting point. However,
> are that +2 atomic ops per packet really so expensive? How many of
> atomic ops are already on that path? Any measures?

On high-performance multiqueue NICs, those two atomic ops are pretty
well guaranteed to be contended every time.  It's a scalability
nightmare.