netdev - Re: [PATCH] bgmac: Remove all offloading features, including GRO.

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Date:   Fri, 15 Sep 2017 17:03:30 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Rosen Penev <rosenp@...il.com>, netdev@...r.kernel.org,
        zajec5@...il.com, nbd@....name
Subject: Re: [PATCH] bgmac: Remove all offloading features, including GRO.

On Fri, 2017-09-15 at 15:54 -0700, Florian Fainelli wrote:
> On September 15, 2017 3:22:18 PM PDT, Rosen Penev <rosenp@...il.com>
> wrote:
> >On a linksys E1200v1 (actually a crossflashed E1000v2), the
> offloading
> >features give no measurable benefit to speed or latency. Furthermore,
> >disabling GRO actually improves iperf performance by a whoppimg
> 3mbps.
> 
> Do you have a way to generate gigabit tests and see what results you
> are getting? We probably are not going to see a 30% improvement just
> by extrapolation.
> 
+1

It seems silly to remove NETIF_F_SG | NETIF_F_IP_CSUM |
NETIF_F_IPV6_CSUM from dev->features, yet leave the dead-code in the
driver to handle these features.

And of course GRO was not removed, meaning the bench results were non
conclusive.