netdev - Re: [PATCH v2 net-next] net: sk

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Date:   Tue, 19 Sep 2017 14:33:13 -0400
From:   Soheil Hassas Yeganeh <soheil.kdev@...il.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Soheil Hassas Yeganeh <soheil@...gle.com>,
        Wei Wang <weiwan@...gle.com>,
        Willem de Bruijn <willemb@...gle.com>
Subject: Re: [PATCH v2 net-next] net: sk_buff rbnode reorg

On Tue, Sep 19, 2017 at 8:14 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> From: Eric Dumazet <edumazet@...gle.com>
>
> skb->rbnode shares space with skb->next, skb->prev and skb->tstamp
>
> Current uses (TCP receive ofo queue and netem) need to save/restore
> tstamp, while skb->dev is either NULL (TCP) or a constant for a given
> queue (netem).
>
> Since we plan using an RB tree for TCP retransmit queue to speedup SACK
> processing with large BDP, this patch exchanges skb->dev and
> skb->tstamp.
>
> This saves some overhead in both TCP and netem.
>
> v2: removes the swtstamp field from struct tcp_skb_cb
>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Cc: Soheil Hassas Yeganeh <soheil@...gle.com>
> Cc: Wei Wang <weiwan@...gle.com>
> Cc: Willem de Bruijn <willemb@...gle.com>

Acked-by: Soheil Hassas Yeganeh <soheil@...gle.com>

Very nice!