netdev - RE: [PATCH v4 net-next 12/12] mlx5: support BIG TCP packets

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Message-ID: <171fa77b3b1d44a797b7433783973fb7@AcuMS.aculab.com>
Date:   Mon, 9 May 2022 08:05:14 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Eric Dumazet' <edumazet@...gle.com>,
        Kees Cook <keescook@...omium.org>
CC:     Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <eric.dumazet@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Paolo Abeni <pabeni@...hat.com>,
        netdev <netdev@...r.kernel.org>, Coco Li <lixiaoyan@...gle.com>,
        Tariq Toukan <tariqt@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Leon Romanovsky <leon@...nel.org>
Subject: RE: [PATCH v4 net-next 12/12] mlx5: support BIG TCP packets

From: Eric Dumazet
> Sent: 07 May 2022 12:19
....
> NIC drivers send millions of packets per second.
> We can not really afford copying each component of a frame one byte at a time.

Any run-time checks om memcpy() are also going to kill performance.

The 'user copy hardening' tests already have a measurable
effect on system calls like sendmsg().

	David
 

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