netdev - Re: [PATCH v1 net-next 2/2] tcp: reorganize tcp

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Date: Mon, 4 Dec 2023 21:31:19 +0100
From: Eric Dumazet <edumazet@...gle.com>
To: Coco Li <lixiaoyan@...gle.com>
Cc: Jakub Kicinski <kuba@...nel.org>, Neal Cardwell <ncardwell@...gle.com>, 
	Mubashir Adnan Qureshi <mubashirq@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew@...n.ch>, 
	Jonathan Corbet <corbet@....net>, David Ahern <dsahern@...nel.org>, 
	Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org, Chao Wu <wwchao@...gle.com>, 
	Wei Wang <weiwan@...gle.com>, Pradeep Nemavat <pnemavat@...gle.com>
Subject: Re: [PATCH v1 net-next 2/2] tcp: reorganize tcp_sock fast path variables

On Mon, Dec 4, 2023 at 9:12 PM Coco Li <lixiaoyan@...gle.com> wrote:
>
> The variables are organized according in the following way:
>
> - TX read-mostly hotpath cache lines
> - TXRX read-mostly hotpath cache lines
> - RX read-mostly hotpath cache lines
> - TX read-write hotpath cache line
> - TXRX read-write hotpath cache line
> - RX read-write hotpath cache line
>
> Fastpath cachelines end after rcvq_space.
>
> Cache line boundaries are enforced only between read-mostly and
> read-write. That is, if read-mostly tx cachelines bleed into
> read-mostly txrx cachelines, we do not care. We care about the
> boundaries between read and write cachelines because we want
> to prevent false sharing.
>
> Fast path variables span cache lines before change: 12
> Fast path variables span cache lines after change: 8
>
> Suggested-by: Eric Dumazet <edumazet@...gle.com>
> Reviewed-by: Wei Wang <weiwan@...gle.com>
> Signed-off-by: Coco Li <lixiaoyan@...gle.com>
>

Reviewed-by: Eric Dumazet <edumazet@...gle.com>