netdev - GRO: very bad routing performance with 3.14.4 for GRE-packets

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Message-ID: <1442942.x8F4o95O8x@h2o.as.studentenwerk.mhn.de>
Date:	Tue, 08 Jul 2014 22:35:41 +0200
From:	Wolfgang Walter <linux@...m.de>
To:	netdev <netdev@...r.kernel.org>
Subject: GRO: very bad routing performance with 3.14.4 for GRE-packets

Hello,

I upgraded a router from 3.10.46 to 3.14.4 and I see a dramatic perfomance 
loss for GRE-pakets if (and only if) GRO is enabled on the incoming or 
outgoing interface (drops to 1/50th to 1/100th).

Other traffic is just fine.

The router itself is not endpoint of the GRE-tunnel.

The router has connection tracking enabled and does NAT (but most of the 
traffic is not NATed nor are GRE-packets).

The network card is an Intel Corporation I350 Gigabit (both interfaces).

Regards,
-- 
Wolfgang Walter
Studentenwerk München
Anstalt des öffentlichen Rechts
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