netdev - Re: [PATCH] geneve: Use GRO cells infrastructure.

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Date:	Sat, 29 Aug 2015 13:45:37 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jesse@...ira.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] geneve: Use GRO cells infrastructure.

From: Jesse Gross <jesse@...ira.com>
Date: Fri, 28 Aug 2015 16:54:40 -0700

> Geneve can benefit from GRO at the device level in a manner similar
> to other tunnels, especially as hardware offloads are still emerging.
> 
> After this patch, aggregated frames are seen on the tunnel interface.
> Single stream throughput nearly doubles in ideal circumstances (on
> old hardware).
> 
> Signed-off-by: Jesse Gross <jesse@...ira.com>

Applied, thanks Jesse.

While reviewing this I noticed that the gro cells code goes through all
of the trouble of allocating full per-cpu objects to manage the packet
queuing and processing, but then it uses a full spinlock for protection.

It ought to be sufficient to just block out BH processing or, at worst,
local cpu interrupts, to protect the individual per-cpu cells.
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