From: Rick Jones <rick.jones2@hp.com>
To: "Edgar E. Iglesias" <edgar.iglesias@gmail.com>
Cc: Andi Kleen <andi@firstfloor.org>, Glen Turner <gdt@gdt.id.au>,
netdev@vger.kernel.org
Subject: Re: UDP path MTU discovery
Date: Mon, 29 Mar 2010 14:01:04 -0700 [thread overview]
Message-ID: <4BB11510.9000302@hp.com> (raw)
In-Reply-To: <20100329205035.GA32656@laped.iglesias.mooo.com>
> Are things really that bad?
>
> These "transactional" IPv6 apps all have the option to stick to 1280
> sized datagrams to avoid the problem. If throughput is an issue these
> apps will surely benefit from proper PMTUD anyway or?
I would get the alphabet soup completely garbled, but the DNS folks are talking
about EDNS (?) message sizes upwards of 4096 bytes - encryption/authentication
and other angels being asked to dance on the head of the DNS pin are asking for
more and more space in the messages.
So, someone will have to blink somewhere - either DNS will have to go TCP and
*possibly* take RTT hits there depending on various patch streams, or the IEEE
will have to sanction jumbo frames and people deploy them widely, or it will
have to become feasible to actually do the occasional IPv6 datagram
fragmentation and get a timely retransmission out of a UDP application on a PMTU
hit.
rick jones
next prev parent reply other threads:[~2010-03-29 21:01 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-26 0:02 UDP path MTU discovery Glen Turner
2010-03-26 0:53 ` Rick Jones
2010-03-26 3:26 ` David Miller
2010-03-26 17:48 ` Rick Jones
2010-03-31 23:42 ` Glen Turner
2010-03-31 23:51 ` Hagen Paul Pfeifer
2010-04-01 0:06 ` Rick Jones
2010-03-26 3:24 ` David Miller
2010-03-28 8:41 ` Andi Kleen
2010-03-31 23:57 ` Glen Turner
2010-04-01 0:57 ` Andi Kleen
2010-03-28 8:50 ` Andi Kleen
2010-03-29 17:01 ` Rick Jones
2010-03-29 20:14 ` Andi Kleen
2010-03-29 20:25 ` Rick Jones
2010-03-29 20:50 ` Edgar E. Iglesias
2010-03-29 21:01 ` Rick Jones [this message]
2010-03-29 21:29 ` Eric Dumazet
2010-03-29 23:38 ` Templin, Fred L
2010-03-30 5:20 ` Andi Kleen
2010-03-30 6:06 ` Eric Dumazet
2010-03-30 6:16 ` Andi Kleen
2010-03-30 6:17 ` UDP path MTU discovery II Andi Kleen
2010-03-30 6:16 ` UDP path MTU discovery Edgar E. Iglesias
2010-03-30 6:19 ` Andi Kleen
2010-03-30 8:20 ` Edgar E. Iglesias
2010-03-30 14:12 ` Andi Kleen
2010-03-30 22:04 ` Edgar E. Iglesias
2010-03-30 15:58 ` Templin, Fred L
2010-03-30 16:06 ` Andi Kleen
2010-03-31 23:43 ` Glen Turner
2010-04-01 0:55 ` Andi Kleen
2010-04-02 5:41 ` Glen Turner
2010-04-04 10:25 ` Andi Kleen
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