netdev - Re: [Bug 213943] New: Poor network speed with 10G NIC with kernel 5.13 (Intel X710-T2L)

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Date:   Mon, 16 Aug 2021 08:14:56 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Jesse Brandeburg <jesse.brandeburg@...el.com>
Cc:     Stephen Hemminger <stephen@...workplumber.org>,
        netdev@...r.kernel.org
Subject: Re: [Bug 213943] New: Poor network speed with 10G NIC with kernel
 5.13 (Intel X710-T2L)

On Thu, 12 Aug 2021 09:25:13 -0700 Stephen Hemminger wrote:
> Begin forwarded message:
> 
> Date: Mon, 02 Aug 2021 14:05:30 +0000
> From: bugzilla-daemon@...zilla.kernel.org
> To: stephen@...workplumber.org
> Subject: [Bug 213943] New: Poor network speed with 10G NIC with kernel 5.13 (Intel X710-T2L)
> 
> 
> https://bugzilla.kernel.org/show_bug.cgi?id=213943
> 
>             Bug ID: 213943
>            Summary: Poor network speed with 10G NIC with kernel 5.13
>                     (Intel X710-T2L)
>            Product: Networking
>            Version: 2.5
>     Kernel Version: 5.13.x
>           Hardware: Intel
>                 OS: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: high
>           Priority: P1
>          Component: IPV4
>           Assignee: stephen@...workplumber.org
>           Reporter: ealrann@...il.com
>         Regression: No
> 
> Hello,
> 
> On a server, I use to receive files (parallel cp with NFS4) with a 10g NIC
> (Intel X710-T2L). I can usually achieve a total speed close to 1 GB/s
> (generally 4 cp at the same time, targeted to 4 different HDD).
> 
> Switching to kernel 5.13 (Archlinux) with the exact same configuration, my
> speed is now limited at 250MB/s. Rolling back to a previous kernel fix the
> speed. 
> 
> The problem is maybe in the last Intel driver i40e, but I don't really know how
> to investigate more.
> 
> 
> The problem still appear in 5.13.7 (last one at the moment).

Jesse, are you aware of anything that could cause this?