netdev - Re: [PATCH net] r8169: disable TSO on a single version of RTL8168c to fix performance

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Message-ID: <d1b1b896-87a2-5f3b-469a-825abfacce5c@gmail.com>
Date:   Tue, 19 Nov 2019 19:01:47 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Corinna Vinschen <vinschen@...hat.com>, netdev@...r.kernel.org
Cc:     nic_swsd@...ltek.com, David Miller <davem@...emloft.net>
Subject: Re: [PATCH net] r8169: disable TSO on a single version of RTL8168c to
 fix performance

On 19.11.2019 10:09, Corinna Vinschen wrote:
> During performance testing, I found that one of my r8169 NICs suffered
> a major performance loss, a 8168c model.
> 
> Running netperf's TCP_STREAM test didn't return the expected
> throughput of > 900 Mb/s, but rather only about 22 Mb/s.  Strange
> enough, running the TCP_MAERTS and UDP_STREAM tests all returned with
> throughput > 900 Mb/s, as did TCP_STREAM with the other r8169 NICs I can
> test (either one of 8169s, 8168e, 8168f).
> 
> Bisecting turned up commit 93681cd7d94f83903cb3f0f95433d10c28a7e9a5,
> "r8169: enable HW csum and TSO" as the culprit.
> 
> I added my 8168c version, RTL_GIGA_MAC_VER_22, to the code
> special-casing the 8168evl as per the patch below.  This fixed the
> performance problem for me.
> 
> Fixes: 93681cd7d94f ("r8169: enable HW csum and TSO")
> Signed-off-by: Corinna Vinschen <vinschen@...hat.com>
> ---

Reviewed-by: Heiner Kallweit <hkallweit1@...il.com>