From: Steffen Klassert <steffen.klassert@secunet.com>
To: David Miller <davem@davemloft.net>
Cc: timo.teras@iki.fi, netdev@vger.kernel.org
Subject: Re: [PATCH 0/4] Fix routing metrics
Date: Wed, 8 Feb 2012 08:30:37 +0100 [thread overview]
Message-ID: <20120208073037.GI23142@secunet.com> (raw)
In-Reply-To: <20120206.152916.224032109057159733.davem@davemloft.net>
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.
next prev parent reply other threads:[~2012-02-08 7:30 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-02 10:11 [PATCH 0/4] Fix routing metrics Steffen Klassert
2012-02-02 10:12 ` [PATCH 1/4] inetpeer: Allocate the peer metrics dynamically Steffen Klassert
2012-02-02 10:12 ` [PATCH 2/4] net: Unlink the inetpeer metrics from dst_entry Steffen Klassert
2012-02-02 10:13 ` [PATCH 3/4] inetpeer: protect the inetpeerpeer metrics with rcu Steffen Klassert
2012-02-02 10:14 ` [PATCH 4/4] route: Invalidate the peer metrics along with the routing cache Steffen Klassert
2012-02-06 20:29 ` [PATCH 0/4] Fix routing metrics David Miller
2012-02-08 7:30 ` Steffen Klassert [this message]
2012-02-08 20:18 ` David Miller
2012-02-09 12:44 ` Steffen Klassert
2012-02-09 18:40 ` David Miller
2012-02-10 6:50 ` Steffen Klassert
2012-02-10 7:38 ` David Miller
2012-02-10 7:51 ` Steffen Klassert
2012-02-10 8:12 ` David Miller
2012-02-10 8:44 ` Steffen Klassert
2012-02-10 18:25 ` David Miller
2012-02-21 6:19 ` Steffen Klassert
2012-02-21 6:36 ` David Miller
2012-02-21 8:18 ` Steffen Klassert
2012-02-21 19:24 ` David Miller
2012-02-24 9:08 ` Steffen Klassert
2012-02-24 9:13 ` David Miller
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