netdev - Re: [PATCH 0/4] Fix routing metrics

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Message-ID: <20120208073037.GI23142@secunet.com>
Date:	Wed, 8 Feb 2012 08:30:37 +0100
From:	Steffen Klassert <steffen.klassert@...unet.com>
To:	David Miller <davem@...emloft.net>
Cc:	timo.teras@....fi, netdev@...r.kernel.org
Subject: Re: [PATCH 0/4] Fix routing metrics

On Mon, Feb 06, 2012 at 03:29:16PM -0500, David Miller wrote:
> 
> Thinking about this, it seems overkill to check this on every metric
> access.
> 
> You have an opportunity to validate metrics when the peer is bound to
> the route.
> 
> This is because any change to the FIB metrics, is in turn a change
> to the FIB, which therefore invalidates the entire routing cache.
> 
> So you can be sure that a new route cache entry will be created, and
> at that creation time you can ensure that we'll respect the updated
> FIB metrics if encessary.

Not sure if I get you right here, but that's what this patchset
does. It invalidates the metrics on the peer by incrementing
peer_genid in rt_cache_invalidate() which is invoked on every FIB
change. Then, on slowpath route lookup it checks in rt_init_metrics()
whether the peer_genid changed. If it changed, it exchanges the
invalidated merics with new ones and copies the informations from
the FIB into it.

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