netdev - Re: [PATCH] ipv6: Limit mtu to 65572 bytes

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Message-ID: <534761CA.1040508@linux-ipv6.org>
Date:	Fri, 11 Apr 2014 12:30:18 +0900
From:	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	David Miller <davem@...emloft.net>,
	Francois WELLENREITER <f.wellenreiter@...il.com>,
	netdev@...r.kernel.org, YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
Subject: Re: [PATCH] ipv6: Limit mtu to 65572 bytes

Eric,

YOSHIFUJI Hideaki wrote:
> Eric Dumazet wrote:
>> 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>

Oops, you need to change the subject as well.
Otherwise, I am okay.

Thanks a lot.

--yoshfuji
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