netdev - Re: [PATCH] r8169: add support for 16K jumbo frames on RTL8125B

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Message-ID: <CALjTZvYeKG=VdOg9XoJEfCXVOLd8mBWnk9xqYOOSOG=1wC9M9A@mail.gmail.com>
Date: Sat, 1 Mar 2025 19:46:33 +0000
From: Rui Salvaterra <rsalvaterra@...il.com>
To: Heiner Kallweit <hkallweit1@...il.com>
Cc: nic_swsd@...ltek.com, netdev@...r.kernel.org
Subject: Re: [PATCH] r8169: add support for 16K jumbo frames on RTL8125B

Hi again, Heiner,


On Sat, 1 Mar 2025 at 14:12, Heiner Kallweit <hkallweit1@...il.com> wrote:
>
> Depending on the kernel version HW TSO may be be off per default.
> Use ethtool to check/enable HW TSO, and see whether speed improves.

I'm running Linux 6.14-rc4 with my patch. Output from ethtool, when
the MTU is set to 1500:

tcp-segmentation-offload: on
    tx-tcp-segmentation: on
    tx-tcp-ecn-segmentation: off [fixed]
    tx-tcp-mangleid-segmentation: off
    tx-tcp6-segmentation: on


When the MTU is set to 12000:

tcp-segmentation-offload: off
    tx-tcp-segmentation: off [requested on]
    tx-tcp-ecn-segmentation: off [fixed]
    tx-tcp-mangleid-segmentation: off
    tx-tcp6-segmentation: off [requested on]

Which means my test, with a MTU of 1500, was already done with
hardware TSO offloading enabled.


Kind regards,

Rui Salvaterra