netdev - Re: NAT performance issue 944mbit -> ~40mbit

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Message-ID: <20200715133136.5f63360c@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Wed, 15 Jul 2020 13:31:36 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Ian Kumlien <ian.kumlien@...il.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        jeffrey.t.kirsher@...el.com, intel-wired-lan@...ts.osuosl.org
Subject: Re: NAT performance issue 944mbit -> ~40mbit

On Wed, 15 Jul 2020 22:05:58 +0200 Ian Kumlien wrote:
> After a  lot of debugging it turns out that the bug is in igb...
> 
> driver: igb
> version: 5.6.0-k
> firmware-version:  0. 6-1
> 
> 03:00.0 Ethernet controller: Intel Corporation I211 Gigabit Network
> Connection (rev 03)

Unclear to me what you're actually reporting. Is this a regression
after a kernel upgrade? Compared to no NAT?

> It's interesting that it only seems to happen on longer links... Any clues?

Links as in with longer cables?