Re: [PATCH net-next 0/2] tcp/dccp: better use of ephemeral ports

From: Eric Dumazet <edumazet@google.com>
Date: Fri,  5 Feb 2016 18:08:56 -0800

Big servers have bloated bind table, making very hard to succeed
ephemeral port allocations, without special containers/namespace tricks.

This patch series extends the strategy added in commit 07f4c90062f8 
("tcp/dccp: try to not exhaust ip_local_port_range in connect()").

Since ports used by connect() are much likely to be shared among them,
we give a hint to both bind() and connect() to keep the crowds separated
if possible.

Of course, if on a specific host an application needs to allocate ~30000
ports using bind(), it will still be able to do so. Same for ~30000 connect()
to a unique 2-tuple (dst addr, dst port)

New implemetation is also more friendly to softirqs and reschedules.

I'm getting rejects on the second patch, please respin and repost.

Thanks Eric.