netdev - Re: [PATCH net-next] mctp: Reorder fields in 'struct mctp

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Date: Mon, 19 Jun 2023 22:06:59 +0800
From: Jeremy Kerr <jk@...econstruct.com.au>
To: Christophe JAILLET <christophe.jaillet@...adoo.fr>, Matt Johnston
 <matt@...econstruct.com.au>, "David S. Miller" <davem@...emloft.net>, Eric
 Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo
 Abeni <pabeni@...hat.com>
Cc: linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org, 
	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] mctp: Reorder fields in 'struct mctp_route'

Hi Christoph,

> Group some variables based on their sizes to reduce hole and avoid
> padding. On x86_64, this shrinks the size of 'struct mctp_route' from
> 72 to 64 bytes.
> 
> It saves a few bytes of memory and is more cache-line friendly.

The savings will be fairly minimal, but this doesn't affect readability
for the route struct. LGTM.

Acked-by: Jeremy Kerr <jk@...econstruct.com.au>

Thanks!


Jeremy