netdev - Re: [PATCH net-next 05/10] udp: refine __udp_enqueue_schedule

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Message-ID: <c9cd9193-d0cd-4cc8-88cd-4fcc205bbeba@kernel.org>
Date: Wed, 17 Sep 2025 09:39:30 -0600
From: David Ahern <dsahern@...nel.org>
To: Eric Dumazet <edumazet@...gle.com>, "David S . Miller"
 <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>
Cc: Simon Horman <horms@...nel.org>, Willem de Bruijn <willemb@...gle.com>,
 Kuniyuki Iwashima <kuniyu@...gle.com>, netdev@...r.kernel.org,
 eric.dumazet@...il.com
Subject: Re: [PATCH net-next 05/10] udp: refine __udp_enqueue_schedule_skb()
 test

On 9/16/25 10:09 AM, Eric Dumazet wrote:
> Commit 5a465a0da13e ("udp: Fix multiple wraparounds
> of sk->sk_rmem_alloc.") allowed to slightly overshoot
> sk->sk_rmem_alloc, when many cpus are trying
> to feed packets to a common UDP socket.
> 
> This patch, combined with the following one reduces
> false sharing on the victim socket under DDOS.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> ---
>  net/ipv4/udp.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 

Reviewed-by: David Ahern <dsahern@...nel.org>