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Date:	Wed, 25 Apr 2012 11:51:37 +0200
From:	Tore Anderson <tore@....no>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Maciej Żenczykowski <maze@...gle.com>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Tom Herbert <therbert@...gle.com>
Subject: Re: [PATCH net-next] ipv6: RTAX_FEATURE_ALLFRAG causes inefficient TCP segment sizing

* Eric Dumazet

> Hmm, but what if we change linux to choice a) instead of b) ?
>
> That is, not cap mtu to minimum value 1280 (and not use anymore
> RTAX_FEATURE_ALLFRAG) : dst_allfrag() would be always false.

Yep.

> In this case, do we still need to send the frag header ?

No - the (translated) IPv4 packet should then fit onto the small-MTU
IPv4 link without any fragmentation (by the IPv4 router) required. So
you end up with perfectly regular end-to-end Path MTU Discovery.

Tore
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