netdev - GRO: forwading ISATAP packets is very slow with kernel 4.1

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Message-ID: <17762800.UBb5paxXY3@h2o.as.studentenwerk.mhn.de>
Date:	Wed, 15 Jul 2015 00:16:30 +0200
From:	Wolfgang Walter <linux@...m.de>
To:	netdev@...r.kernel.org
Cc:	Herbert Xu <herbert@...dor.apana.org.au>
Subject: GRO: forwading ISATAP packets is very slow with kernel 4.1

Hello,

I upgraded routers from 3.14.x to 4.1.2. Forwarding ISATAP-packets (IPv4 
packets with IPv6 payload) is very slow with 4.1 if GRO is enabled (youtube 
for example about 64kbit). Disabling GRO on the interfaces restores 
performance to values comparable to 3.14.x.

The kernel is build with IPv6 support but IPv6 is disabled via kernel command 
line. The router is not a tunnel endpoint, it only forwards the ISATAP-
packets. MTU is 1500 on both interfaces. Netfilter conntrack is not used and 
disabling netfilter has no effect.

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