netdev - Re: [net-next, RFC, 4/8] net: core: add recycle capabilities on skbs via page

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Date:   Sat, 08 Dec 2018 12:10:32 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     brouer@...hat.com
Cc:     fw@...len.de, netdev@...r.kernel.org, toke@...e.dk,
        ard.biesheuvel@...aro.org, jasowang@...hat.com,
        ilias.apalodimas@...aro.org, bjorn.topel@...el.com, w@....eu,
        saeedm@...lanox.com, mykyta.iziumtsev@...il.com,
        borkmann@...earbox.net, alexei.starovoitov@...il.com,
        tariqt@...lanox.com
Subject: Re: [net-next, RFC, 4/8] net: core: add recycle capabilities on
 skbs via page_pool API

From: Jesper Dangaard Brouer <brouer@...hat.com>
Date: Sat, 8 Dec 2018 12:36:10 +0100

> The annoying part is actually that depending on the kernel config
> options CONFIG_XFRM, CONFIG_NF_CONNTRACK and CONFIG_BRIDGE_NETFILTER,
> whether there is a cache-line split, where mem_info gets moved into the
> next cacheline.

Note that Florian Westphal's work (trying to help MP-TCP) would
eliminate this variability.