netdev - Re: [PATCH iproute2-next] ss: Show zerocopy sendfile status of TLS sockets

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Date:   Wed, 1 Jun 2022 08:42:16 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Maxim Mikityanskiy <maximmi@...dia.com>
Cc:     David Ahern <dsahern@...il.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Tariq Toukan <tariqt@...dia.com>,
        Boris Pismenny <borisp@...dia.com>, netdev@...r.kernel.org
Subject: Re: [PATCH iproute2-next] ss: Show zerocopy sendfile status of TLS
 sockets

On Wed, 1 Jun 2022 11:58:22 +0300 Maxim Mikityanskiy wrote:
> > For device offload only. Allow sendfile() data to be transmitted directly
> > to the NIC without making an in-kernel copy. This allows true zero-copy
> > behavior when device offload is enabled.  
> 
> I suggest mentioning the purpose of this optimization: a huge 
> performance boost of up to 2.4 times compared to non-zerocopy device 
> offload. See the performance numbers from my commit message:

That reads like and ad to me.