From: Tore Anderson <tore@fud.no>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: "Maciej Żenczykowski" <maze@google.com>,
"David Miller" <davem@davemloft.net>,
netdev <netdev@vger.kernel.org>,
"Tom Herbert" <therbert@google.com>
Subject: Re: [PATCH net-next] ipv6: RTAX_FEATURE_ALLFRAG causes inefficient TCP segment sizing
Date: Wed, 25 Apr 2012 11:51:37 +0200 [thread overview]
Message-ID: <171c22af5ae0b0f70e7b81baad260de6@greed.fud.no> (raw)
In-Reply-To: <1335346710.3274.24.camel@edumazet-glaptop>
* 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
next prev parent reply other threads:[~2012-04-25 9:51 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-24 17:37 [PATCH net-next] ipv6: RTAX_FEATURE_ALLFRAG causes inefficient TCP segment sizing Eric Dumazet
2012-04-24 19:49 ` Maciej Żenczykowski
2012-04-24 20:10 ` Eric Dumazet
2012-04-24 21:50 ` Maciej Żenczykowski
2012-04-24 21:51 ` Maciej Żenczykowski
2012-04-25 5:32 ` Eric Dumazet
2012-04-25 7:34 ` Maciej Żenczykowski
2012-04-25 9:20 ` Tore Anderson
2012-04-25 9:38 ` Eric Dumazet
2012-04-25 9:51 ` Tore Anderson [this message]
2012-04-25 9:52 ` Maciej Żenczykowski
2012-04-25 10:02 ` Eric Dumazet
2012-04-25 18:39 ` David Miller
2012-04-25 9:48 ` Maciej Żenczykowski
2012-04-25 10:04 ` Tore Anderson
2012-04-25 10:15 ` Eric Dumazet
2012-04-25 10:30 ` Maciej Żenczykowski
2012-04-25 10:44 ` Eric Dumazet
2012-04-26 10:32 ` Tore Anderson
2012-04-25 10:45 ` Tore Anderson
2012-04-25 11:02 ` Maciej Żenczykowski
2012-04-25 11:49 ` Tore Anderson
2012-04-25 11:55 ` Maciej Żenczykowski
2012-04-27 4:03 ` David Miller
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