netdev - Re: [PATCH 5/5] ipv4: Don't use the cached pmtu informations for input routes

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Date:	Wed, 23 Nov 2011 19:17:58 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.hengli.com.au
Cc:	steffen.klassert@...unet.com, netdev@...r.kernel.org
Subject: Re: [PATCH 5/5] ipv4: Don't use the cached pmtu informations for
 input routes

From: Herbert Xu <herbert@...dor.hengli.com.au>
Date: Thu, 24 Nov 2011 08:10:35 +0800

> Is there a particular scenario where this breaks? I could only think
> of policy routing cases but that's not unique to forwarding as it
> also affects us as a host.

Steffen has a specific situation.

But regardless I think the current behavior is terrible.

It means there is a propagation delay of PMTU increasing which is on the
order of the number of hops between the sender and the PMTU increased link.
So if the PMTU timeout is X, the propagation time is X * N_HOPS.
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