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Date:   Mon, 1 Apr 2019 18:31:39 +0100
From:   Edward Cree <>
To:     David Miller <>, <>
CC:     <>, <>,
        <>, <>
Subject: Re: [PATCH net-next] r8169: use netif_receive_skb_list batching

On 01/04/2019 18:14, David Miller wrote:
> From: Eric Dumazet <>
> Date: Mon, 1 Apr 2019 02:17:12 -0700
>> This means no GRO at all
> I do not think that is true as the SKB list layer does queue up to
> GRO.
No, Eric is right; the current list layer bypasses GRO completely.

netif_receive_skb_list() ends up doing the same things netif_receive_skb()
would do on each SKB in the list, and that does not include GRO.
(For this reason the sfc driver only uses netif_receive_skb_list() for
non-TCP packets; TCP packets go to napi_gro_frags().)
I had a patch series to add napi_gro_receive_list() which would use the
SKB list layer to handle the packets GRO didn't coalesce ([1]) but the
performance tests I ran were inconclusive and it never got applied.



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