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

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Message-ID: <375c389d-f391-5b72-bc52-9a82d61c6bd7@gmail.com>
Date:   Sun, 23 Sep 2018 14:42:30 -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, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] tcp: expose sk_state in tcp_retransmit_skb
 tracepoint



On 09/23/2018 12:49 PM, Yafang Shao wrote:
> With sk_state, we can know whether this connection is in SYN_SENT state
> or ESTBLISHED state.
> The reason to distinguish between these two scenario is that the
> retransmission in ESTABLISHED state always mean network congestion while
> in SYN_SENT state it always mean server issue, i.e. the syn packet is
> dropped due to syn backlog queue full.

You mean, a packet drop on the remote peer ?

It could also be a packet drop in the network.

Your patch is good, but changelog is quite misleading.