linux-kernel - Re: [PATCH net 1/4] net/udp_gso: Allow TX timestamp with UDP GSO

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Message-Id: <7FB4B2F6-A7F3-4565-8D53-CF0E5A3EEFA4@appneta.com>
Date:   Sat, 25 May 2019 13:46:07 -0700
From:   Fred Klassen <fklassen@...neta.com>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Shuah Khan <shuah@...nel.org>,
        Network Development <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-kselftest@...r.kernel.org,
        Willem de Bruijn <willemb@...gle.com>
Subject: Re: [PATCH net 1/4] net/udp_gso: Allow TX timestamp with UDP GSO



> On May 23, 2019, at 2:39 PM, Willem de Bruijn <willemdebruijn.kernel@...il.com> wrote:
> Zerocopy notification reference count is managed in skb_segment. That
> should work.
> 

I’m trying to understand the context of reference counting in skb_segment. I assume that
there is an opportunity to optimize the count of outstanding zerocopy buffers, but I 
can’t see it. Please clarify.