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Date:   Fri, 24 Nov 2017 11:43:13 -0700
From:   David Ahern <>
To:     Eric Dumazet <>,
        Solio Sarabia <>,,,
Subject: Re: [PATCH] net-sysfs: export gso_max_size attribute

On 11/24/17 11:32 AM, Eric Dumazet wrote:
> On Fri, 2017-11-24 at 10:14 -0700, David Ahern wrote:
>> 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 <>
>>> Signed-off-by: Solio Sarabia <>
>>> ---
>> This should be added to rtnetlink rather than sysfs.
> This is already exposed by rtnetlink [1]

It currently is read-only. This patch wants to control setting it.

> Please lets not add yet another net-sysfs knob.

Which is my main point - no more sysfs files.

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