netdev - Re: [PATCH net-next] net: ipv6/gre: Add GRO support

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Message-ID: <8dd7220e-e536-f89b-e5d4-27e57f319e0f@gmail.com>
Date:   Sun, 1 Apr 2018 09:35:05 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Tariq Toukan <tariqt@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, Eran Ben Elisha <eranbe@...lanox.com>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH net-next] net: ipv6/gre: Add GRO support



On 04/01/2018 06:17 AM, Tariq Toukan wrote:
> From: Eran Ben Elisha <eranbe@...lanox.com>
> 
> Add GRO capability for IPv6 GRE tunnel and ip6erspan tap, via gro_cells
> infrastructure.
> 
> Performance testing: 55% higher badwidth.
> Measuring bandwidth of 1 thread IPv4 TCP traffic over IPv6 GRE tunnel
> while GRO on the physical interface is disabled.
> CPU: Intel Xeon E312xx (Sandy Bridge)
> NIC: Mellanox Technologies MT27700 Family [ConnectX-4]
> Before (GRO not working in tunnel) : 2.47 Gbits/sec
> After  (GRO working in tunnel)     : 3.85 Gbits/sec
> 
> Signed-off-by: Eran Ben Elisha <eranbe@...lanox.com>
> Signed-off-by: Tariq Toukan <tariqt@...lanox.com>
> CC: Eric Dumazet <edumazet@...gle.com>
> ---


Seems good, but why isn't this handled directly in GRO native layer ?