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

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Date:   Tue, 19 Sep 2017 15:20:37 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     eric.dumazet@...il.com
Cc:     netdev@...r.kernel.org, soheil@...gle.com, weiwan@...gle.com,
        willemb@...gle.com
Subject: Re: [PATCH v2 net-next] net: sk_buff rbnode reorg

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Tue, 19 Sep 2017 05:14:24 -0700

> 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>

Looks great, applied, thanks Eric.