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

Begin forwarded message:

Date: Mon, 02 Aug 2021 14:05:30 +0000
From: bugzilla-daemon@bugzilla.kernel.org
To: stephen@networkplumber.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@networkplumber.org
          Reporter: ealrann@gmail.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).

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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@bugzilla.kernel.org
To: stephen@networkplumber.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@networkplumber.org
          Reporter: ealrann@gmail.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?

On 8/16/2021 8:14 AM, Jakub Kicinski wrote:

The problem still appear in 5.13.7 (last one at the moment).
Jesse, are you aware of anything that could cause this?

Hey! Thanks for copying me on this report. I've added myself to the CC
and I'll file an internal bug to get attention to the issue.

FWIW, I haven't heard anything about a known issue like this, nor has
the lead (Aleksander Loktionov) of i40e. So at this point we just need
to investigate.

I've also asked the reporter for some extra info in the Bugzilla.


Thanks!

Jesse