netdev - Re: 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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Date:   Thu, 5 Jan 2023 18:43:13 +0100
From:   Eric Dumazet <edumazet@...gle.com>
To:     Jaroslav Pulchart <jaroslav.pulchart@...ddata.com>
Cc:     netdev@...r.kernel.org, lixiaoyan@...gle.com, pabeni@...hat.com,
        davem@...emloft.net, Igor Raits <igor.raits@...ddata.com>
Subject: Re: Network performance regression with linux 6.1.y. Issue bisected
 to "5eddb24901ee49eee23c0bfce6af2e83fd5679bd" (gro: add support of (hw)gro
 packets to gro stack)

On Thu, Jan 5, 2023 at 6:37 PM Jaroslav Pulchart
<jaroslav.pulchart@...ddata.com> wrote:
>
> 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.
>

Hmm, please provide more information.

NIC used ? (ethtool -i eth0)

ethtool -k eth0  # replace by your netdev name

And packet captures would be nice (with and without the patch)

Thanks.