netdev - Re: [PATCH net-next 2/8] ipv6: add some unlikely()/likely() clauses in ip6

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Message-ID: <CAAVpQUDxd5EzMNz1_=3mgBirMj8RERNgP57bK1uhxB+_tgp4aQ@mail.gmail.com>
Date: Fri, 30 Jan 2026 22:30:10 -0800
From: Kuniyuki Iwashima <kuniyu@...gle.com>
To: Eric Dumazet <edumazet@...gle.com>
Cc: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>, David Ahern <dsahern@...nel.org>, 
	netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: Re: [PATCH net-next 2/8] ipv6: add some unlikely()/likely() clauses
 in ip6_output.c

On Fri, Jan 30, 2026 at 1:03 PM Eric Dumazet <edumazet@...gle.com> wrote:
>
> 1) daddr is unlikely a multicast in ip6_finish_output2().
>
> 2) ip6_finish_output_gso_slowpath_drop() should not be called often.
>
> 3) ip6_fragment() should not be called often.
>
> 4) opt is unlikely to be set.
>
> 5) ip6_xmit() and ip6_forward() mostly sends not too big packets.
>
> 6) Most __ip6_make_skb() calls are for UDP packets,
>    not ICMPV6 ones.
>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Reviewed-by: Kuniyuki Iwashima <kuniyu@...gle.com>