netdev - Re: [PATCH v2 net-next] tcp: expose sk_state in tcp_retransmit

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Date:   Tue, 25 Sep 2018 19:47:01 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Yafang Shao <laoar.shao@...il.com>, edumazet@...gle.com,
        davem@...emloft.net
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH v2 net-next] tcp: expose sk_state in tcp_retransmit_skb
 tracepoint



On 09/24/2018 05:57 AM, Yafang Shao wrote:
> After sk_state exposed, we can get in which state this retransmission
> occurs. That could give us more detail for dignostic.
> For example, if this retransmission occurs in SYN_SENT state, it may
> also indicates that the syn packet may be dropped on the remote peer due
> to syn backlog queue full and then we could check the remote peer.
> 
> BTW,SYNACK retransmission is traced in tcp_retransmit_synack tracepoint.
> 
> Signed-off-by: Yafang Shao <laoar.shao@...il.com>

Signed-off-by: Eric Dumazet <edumazet@...gle.com>