netdev - Re: [PATCH net-next-2.6] tcp: Add SNMP counter for DEFER

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Message-Id: <20100321.183232.123981427.davem@davemloft.net>
Date:	Sun, 21 Mar 2010 18:32:32 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next-2.6] tcp: Add SNMP counter for DEFER_ACCEPT

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 19 Mar 2010 16:37:18 +0100

> Its currently hard to diagnose when ACK frames are dropped because an
> application set TCP_DEFER_ACCEPT on its listening socket.
> 
> See http://bugzilla.kernel.org/show_bug.cgi?id=15507
> 
> This patch adds a SNMP value, named TCPDeferAcceptDrop
> 
> netstat -s | grep TCPDeferAcceptDrop
>     TCPDeferAcceptDrop: 0
> 
> This counter is incremented every time we drop a pure ACK frame received
> by a socket in SYN_RECV state because its SYNACK retrans count is lower
> than defer_accept value.
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

Applied, thanks Eric.
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