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

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Date:   Fri, 15 Sep 2017 16:14:03 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     rosenp@...il.com
Cc:     netdev@...r.kernel.org, zajec5@...il.com, nbd@....name
Subject: Re: [PATCH] bgmac: Remove all offloading features, including GRO.

From: Rosen Penev <rosenp@...il.com>
Date: Fri, 15 Sep 2017 15:22:18 -0700

> 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. Results:
 ...
> -	net_dev->features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
> +	net_dev->features &= NETIF_F_GRO;
>  	net_dev->hw_features = net_dev->features;

This doesn't disable GRO.