linux-kernel - Re: [PATCH v2 net-next] tcp: add new SNMP counter for drops when try to queue in rcv queue

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Message-Id: <20180630.184406.1626314416899588727.davem@davemloft.net>
Date:   Sat, 30 Jun 2018 18:44:06 +0900 (KST)
From:   David Miller <davem@...emloft.net>
To:     laoar.shao@...il.com
Cc:     edumazet@...gle.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 net-next] tcp: add new SNMP counter for drops when
 try to queue in rcv queue

From: Yafang Shao <laoar.shao@...il.com>
Date: Thu, 28 Jun 2018 00:22:56 -0400

> When sk_rmem_alloc is larger than the receive buffer and we can't
> schedule more memory for it, the skb will be dropped.
> 
> In above situation, if this skb is put into the ofo queue,
> LINUX_MIB_TCPOFODROP is incremented to track it.
> 
> While if this skb is put into the receive queue, there's no record.
> So a new SNMP counter is introduced to track this behavior.
> 
> LINUX_MIB_TCPRCVQDROP:  Number of packets meant to be queued in rcv queue
> 			but dropped because socket rcvbuf limit hit.
> 
> Signed-off-by: Yafang Shao <laoar.shao@...il.com>

Applied to net-next.