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

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Date:	Fri, 10 Feb 2012 02:38:15 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	steffen.klassert@...unet.com
Cc:	timo.teras@....fi, netdev@...r.kernel.org
Subject: Re: [PATCH 0/4] Fix routing metrics

From: Steffen Klassert <steffen.klassert@...unet.com>
Date: Fri, 10 Feb 2012 07:50:31 +0100

> On Thu, Feb 09, 2012 at 01:40:10PM -0500, David Miller wrote:
>> From: Steffen Klassert <steffen.klassert@...unet.com>
>> > 
>> > Hm, I still don't get your point. Could you specify this please?
>> > 
>> > When a route cache entry is created and the peer_genid does not match
>> > the genid on the inetpeer, fresh inetpeer metrics are allocated  and
>> > then published. After that, the new metrics are in proper state and
>> > ready to use.
>> 
>> Right, which is exactly what you want to happen.
>> 
>> Checking on every metric access is therefore pointless and needless.
>> 
>> The peer_genid only increments when the routing cache is flushed,
>> therefore every subsequent access to the metrics will go through the
>> route cache entry creation path first, and therefore that will make
>> sure fresh inetpeer metrics will be allocated since the peer_genid
>> does not match.
> 
> I fully agree with you here. But we check for the genid just in
> rt_init_metrics() which is invoked only on route cache entry
> creation. There is no check when the metrics are accessed,
> because the metrics on the inetpeer are valid on every access.

Every routing cache entry we will use after the flush will be
a newly created one!  All the old ones will be stop being used.
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