netdev - Re: [PATCH net] netfilter: ipv6: nf_defrag: reduce struct net memory waste

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Date:   Mon, 18 Jun 2018 14:14:11 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
        Florian Westphal <fw@...len.de>,
        netfilter-devel@...r.kernel.org, netdev <netdev@...r.kernel.org>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [PATCH net] netfilter: ipv6: nf_defrag: reduce struct net memory
 waste

On Wed, Jun 13, 2018 at 10:11:56AM -0700, Eric Dumazet wrote:
> It is a waste of memory to use a full "struct netns_sysctl_ipv6"
> while only one pointer is really used, considering netns_sysctl_ipv6
> keeps growing.
> 
> Also, since "struct netns_frags" has cache line alignment,
> it is better to move the frags_hdr pointer outside, otherwise
> we spend a full cache line for this pointer.
> 
> This saves 192 bytes of memory per netns.

Also applied, thanks.