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Date:	Wed, 14 Jan 2015 16:14:10 -0800
From:	Eric Dumazet <>
To:	Martin KaFai Lau <>
Subject: Re: [PATCH RFC v2 net-next 1/2] ip_tunnel: Create percpu gro_cell

On Tue, 2015-01-13 at 15:42 -0800, Martin KaFai Lau wrote:
> In the ipip tunnel, the skb->queue_mapping is lost in ipip_rcv().
> All skb will be queued to the same cell->napi_skbs.  The
> gro_cell_poll is pinned to one core under load.  In production traffic,
> we also see severe rx_dropped in the tunl iface and it is probably due to
> this limit: skb_queue_len(&cell->napi_skbs) > netdev_max_backlog.
> This patch is trying to alloc_percpu(struct gro_cell) and schedule
> gro_cell_poll to process the skb in the same core.
> Signed-off-by: Martin KaFai Lau <>
> ---

Acked-by: Eric Dumazet <>

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