netdev - Re: [PATCH] tcp: ensure non-empty connection request queue

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Date:	Wed, 04 May 2016 11:18:25 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Rick Jones <rick.jones2@....com>
Cc:	Peter Wu <peter@...ensteyn.nl>,
	"David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Eric Dumazet <edumazet@...gle.com>,
	Kui Zhang <kuizhang@...il.com>
Subject: Re: [PATCH] tcp: ensure non-empty connection request queue

On Wed, 2016-05-04 at 11:05 -0700, Rick Jones wrote:

> Assuming Peter's assertion about just drops when syncookies are not 
> enabled is accurate, should there be some one-time message in that case too?

We have plenty of drop points in the kernel without a message in syslog,
but proper SNMP counter updates.

Look at my recent commit 
9caad864151e525 ("tcp: increment sk_drops for listeners")

"ss -tm state listening" will show you the drop count per listener.