netdev - Re: Regarding Routing cache

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Message-ID: <1321514818.3274.37.camel@edumazet-laptop>
Date:	Thu, 17 Nov 2011 08:26:58 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ajith Adapa <adapa.ajith@...il.com>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: Regarding Routing cache


Please, no private mails on this discussion. I added back netdev on CC.

Le jeudi 17 novembre 2011 à 12:09 +0530, Ajith Adapa a écrit :
> Hi,
> 
> Sorry about my naive post regarding the issue.
> 
> > IPv6 has no routing cache, and wont have one, since we are trying to
> > remove IPv4 routing cache :)
> 
> But it would have performance issues right as we always check fib
> table for destination route ?
> 
> Is there any references or posts or material which takes about the
> reason for removing the ipv6 and ipv4 routing caches ?
> 

routing cache doesnt scale and was difficult to tune in some situations.

It uses a lot of memory, and doesnt fit in CPU caches.

It was a good solution in the past, but better is to get scalable algo
in the first place.

http://vger.kernel.org/netconf2011.html

http://vger.kernel.org/netconf2011_slides/davem_netconf2011.pdf



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