netdev - Re: [PATCH] net-sysfs: export gso_max

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Date:   Fri, 24 Nov 2017 10:14:51 -0700
From:   David Ahern <dsahern@...il.com>
To:     Solio Sarabia <solio.sarabia@...el.com>, netdev@...r.kernel.org,
        davem@...eloft.net, stephen@...workplumber.org
Cc:     kys@...rosoft.com, shiny.sebastian@...el.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net-sysfs: export gso_max_size attribute

On 11/22/17 5:30 PM, Solio Sarabia wrote:
> The netdevice gso_max_size is exposed to allow users fine-control on
> systems with multiple NICs with different GSO buffer sizes, and where
> the virtual devices like bridge and veth, need to be aware of the GSO
> size of the underlying devices.
> 
> In a virtualized environment, setting the right GSO sizes for physical
> and virtual devices makes all TSO work to be on physical NIC, improving
> throughput and reducing CPU util. If virtual devices send buffers
> greater than what NIC supports, it forces host to do TSO for buffers
> exceeding the limit, increasing CPU utilization in host.
> 
> Suggested-by: Shiny Sebastian <shiny.sebastian@...el.com>
> Signed-off-by: Solio Sarabia <solio.sarabia@...el.com>
> ---

This should be added to rtnetlink rather than sysfs.