netdev - Re: [PATCH v3 net-next 1/1] ip_tunnel: Create percpu gro

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Date:	Sun, 18 Jan 2015 01:57:22 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	kafai@...com
Cc:	netdev@...r.kernel.org, eric.dumazet@...il.com, kernel-team@...com
Subject: Re: [PATCH v3 net-next 1/1] ip_tunnel: Create percpu gro_cell

From: Martin KaFai Lau <kafai@...com>
Date: Fri, 16 Jan 2015 10:11:00 -0800

> 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 <kafai@...com>

Applied, thanks.
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