netdev - Re: [PATCH net-next 3/3] ipv4: use separate genid for next hop exceptions

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Message-Id: <20130603.001008.1226532904370669292.davem@davemloft.net>
Date:	Mon, 03 Jun 2013 00:10:08 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	timo.teras@....fi
Cc:	netdev@...r.kernel.org, steffen.klassert@...unet.com
Subject: Re: [PATCH net-next 3/3] ipv4: use separate genid for next hop
 exceptions

From: Timo Teräs <timo.teras@....fi>
Date: Tue, 28 May 2013 09:46:33 +0300

> commit 13d82bf5 (ipv4: Fix flushing of cached routing informations)
> added the support to flush learned pmtu information.
> 
> However, using rt_genid is quite heavy as it is bumped on route
> add/change and multicast events amongst other places. These can
> happen quote often, especially if using dynamic routing protocols.
> 
> While this is ok with routes (as they are just recreated locally),
> the pmtu information is learned from remote systems and the icmp
> notification can come with long delays. It is worthy to have separate
> genid to avoid excessive pmtu resets.
> 
> Cc: Steffen Klassert <steffen.klassert@...unet.com>
> Signed-off-by: Timo Teräs <timo.teras@....fi>

Applied.
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