netdev - Re: [PATCH 1/1] net: Add SO_REUSEPORT_LISTEN

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Message-ID: <1450203712.8474.46.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Tue, 15 Dec 2015 10:21:52 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Willy Tarreau <w@....eu>
Cc:	Tom Herbert <tom@...bertland.com>,
	Tolga Ceylan <tolga.ceylan@...il.com>,
	Aaron Conole <aconole@...heb.org>,
	"David S. Miller" <davem@...emloft.net>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [PATCH 1/1] net: Add SO_REUSEPORT_LISTEN_OFF socket option as
 drain mode

On Tue, 2015-12-15 at 18:43 +0100, Willy Tarreau wrote:

> Ah ? but what does it bring in this case ? I'm not seeing it used
> anywhere on a listening socket. The code took care of not breaking
> them though (ie they still accept if no other socket shows up with
> a higher score). Otherwise we'll have to switch to Tolga's patch,
> unless we find another socket option that can safely be combined
> and which makes sense (I often find it better not to make userland
> depend on new updates of includes when possible).

Socket options set on the listener before the accept() are inherited.

Applications wanting SO_LINGER special settings on all their sockets can
use a single system call right before listen().

Some servers having to deal with TIME_WAIT proliferation very often use
SO_LINGER with timeout 0


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