linux-kernel - Re: [PATCH net-next] tcp: minor optimization for calculating packets

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Date:   Sat, 15 Dec 2018 04:59:00 -0800
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: minor optimization for calculating
 packets_out in tcp connect



On 12/15/2018 01:33 AM, Yafang Shao wrote:
> When we building a syn packet, the tcp_skb_pcount(skb) is always 1,
> which is set in tcp_init_nondata_skb().
> Regarding the syn_data, it is set through
> memcpy(syn_data->cb, syn->cb, sizeof(syn->cb)),
> which is always 1 as well.
> 
> So we don't need to use tcp_skb_pcount(skb), that could give us a
> little improvement.
>

I dunno, I find current code more self-documented.

This is not fast path, so I would suggest we keep it.

Thanks.