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

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Date:	Wed, 15 Jul 2015 08:08:49 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Wolfgang Walter <linux@...m.de>
Cc:	netdev@...r.kernel.org
Subject: Re: GRO: forwading ISATAP packets is very slow with kernel 4.1

On Wed, Jul 15, 2015 at 12:16:30AM +0200, Wolfgang Walter wrote:
> 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.

Can you run some tcpdumps and post the results in the two cases?

Thanks,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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