netdev - Re: [PATCH v3] ipv6: Limit mtu to 65575 bytes

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Message-Id: <20140411.164848.983714986536717393.davem@davemloft.net>
Date:	Fri, 11 Apr 2014 16:48:48 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	yoshfuji@...ux-ipv6.org, hannes@...essinduktion.org,
	f.wellenreiter@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH v3] ipv6: Limit mtu to 65575 bytes

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 10 Apr 2014 21:23:36 -0700

> From: Eric Dumazet <edumazet@...gle.com>
> 
> Francois reported that setting big mtu on loopback device could prevent
> tcp sessions making progress.
> 
> We do not support (yet ?) IPv6 Jumbograms and cook corrupted packets.
> 
> We must limit the IPv6 MTU to (65535 + 40) bytes in theory.
> 
> Tested:
> 
> ifconfig lo mtu 70000
> netperf -H ::1
> 
> Before patch : Throughput :   0.05 Mbits
> 
> After patch : Throughput : 35484 Mbits
> 
> Reported-by: Francois WELLENREITER <f.wellenreiter@...il.com>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Acked-by: YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>

Applied and queued up for -stable, thanks Eric.
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