netdev - Re: increase the number of routing tables

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Message-Id: <20120129.160152.1463516627658543873.davem@davemloft.net>
Date:	Sun, 29 Jan 2012 16:01:52 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	greearb@...delatech.com
Cc:	eric.dumazet@...il.com, simonchennj@...il.com,
	netdev@...r.kernel.org
Subject: Re: increase the number of routing tables

From: Ben Greear <greearb@...delatech.com>
Date: Sat, 28 Jan 2012 18:46:01 -0800

> On 01/28/2012 06:41 PM, Eric Dumazet wrote:
>> Its is possible, but probably not scalable.
> 
> I've run with a few thousand routing tables and probably 5000 or so
> rules.  It seems to run OK....
> 
>> You really should not have too many "ip rule" entries, since they are
>> evaluated linearly.
> 
> For every packet, or maybe just until conn-track gets an entry
> for the connection?

When the routing cache is removed, using a huge number of rules is not
going to be something you want to do any more because the rule table
will be inspected on every route lookup.
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