netdev - Network performance regression with linux 6.1.y. Issue bisected to "5eddb24901ee49eee23c0bfce6af2e83fd5679bd" (gro: add support of (hw)gro packets to gro stack)

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Message-ID: <CAK8fFZ5pzMaw3U1KXgC_OK4shKGsN=HDcR62cfPOuL0umXE1Ww@mail.gmail.com>
Date:   Thu, 5 Jan 2023 18:37:09 +0100
From:   Jaroslav Pulchart <jaroslav.pulchart@...ddata.com>
To:     edumazet@...gle.com, netdev@...r.kernel.org, lixiaoyan@...gle.com,
        pabeni@...hat.com, davem@...emloft.net
Cc:     Igor Raits <igor.raits@...ddata.com>
Subject: Network performance regression with linux 6.1.y. Issue bisected to
 "5eddb24901ee49eee23c0bfce6af2e83fd5679bd" (gro: add support of (hw)gro
 packets to gro stack)

Hello,

I would like to report a 6.1,y regression in a network performance
observed when using "git clone".

BAD: "git clone" speed with kernel 6.1,y:
   # git clone git@...hub.com:..../.....git
   ...
   Receiving objects:   8% (47797/571306), 20.69 MiB | 3.27 MiB/s

GOOD: "git clone" speed with kernel 6.0,y:
   # git clone git@...hub.com:..../.....git
   ...
   Receiving objects:  72% (411341/571306), 181.05 MiB | 60.27 MiB/s

I bisected the issue to a commit
5eddb24901ee49eee23c0bfce6af2e83fd5679bd "gro: add support of (hw)gro
packets to gro stack". Reverting it from 6.1.y branch makes the git
clone fast like with 6.0.y.

Best regards,
--
Jaroslav Pulchart
Sr. Principal SW Engineer
GoodData