netdev - Re: [PATCH net-next 2/4] net: move net_cookie into net_aligned

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Message-ID: <686000e4103db_a131d2941c@willemb.c.googlers.com.notmuch>
Date: Sat, 28 Jun 2025 10:49:08 -0400
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
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>, 
 netdev@...r.kernel.org, 
 eric.dumazet@...il.com, 
 Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH net-next 2/4] net: move net_cookie into net_aligned_data

Eric Dumazet wrote:
> Using per-cpu data for net->net_cookie generation is overkill,
> because even busy hosts do not create hundreds of netns per second.
> 
> Make sure to put net_cookie in a private cache line to avoid
> potential false sharing.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Reviewed-by: Willem de Bruijn <willemb@...gle.com>