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From: Glen Turner <gdt@gdt.id.au>
To: David Miller <davem@davemloft.net>
Cc: rick.jones2@hp.com, netdev@vger.kernel.org
Subject: Re: UDP path MTU discovery
Date: Thu, 01 Apr 2010 10:12:03 +1030	[thread overview]
Message-ID: <1270078923.2389.31.camel@ilion> (raw)
In-Reply-To: <20100325.202636.149498207.davem@davemloft.net>

On Thu, 2010-03-25 at 20:26 -0700, David Miller wrote:
> We already provide this information.
> 
> The socket ends up with EMSGSIZE in it's error queue, so the next time
> the application does I/O it sees that error immediately from the
> read/write call and thus knows that path MTU arrived.

Thanks David.

Does select() return from its blocking so the application can make
use of this indication immediately, rather than after the
application's exponentially-increasing wait?

Is an incoming ICMP the only cause of EMSGSIZE?  That is, can an
application safely retransmit immediately?

-- 
 Glen Turner
 www.gdt.id.au/~gdt


  parent reply	other threads:[~2010-03-31 23:40 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 [this message]
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
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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