netdev - Re: [PATCH net-next] tcp: use an RB tree for ooo receive queue

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Date:   Wed, 07 Sep 2016 15:32:49 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Yaogong Wang <wygivan@...gle.com>,
        Yuchung Cheng <ycheng@...gle.com>,
        Neal Cardwell <ncardwell@...gle.com>,
        Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>
Subject: Re: [PATCH net-next] tcp: use an RB tree for ooo receive queue

On Wed, 2016-09-07 at 15:26 -0700, Stephen Hemminger wrote:

> How much does this grow the size of tcp socket structure?

This actually shrinks it by 8 bytes, or more on debug kernels where
sizeof(spinlock_t) > 4

Before :

struct sk_buff_head out_of_order_queue;  // At least 24 bytes on 64bit 


After :

2 pointers ( 16 bytes on 64bit )