netdev - Re: increase the number of routing tables

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Date:	Sat, 28 Jan 2012 18:46:01 -0800
From:	Ben Greear <greearb@...delatech.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Simon Chen <simonchennj@...il.com>, netdev@...r.kernel.org
Subject: Re: increase the number of routing tables

On 01/28/2012 06:41 PM, Eric Dumazet wrote:
> Le samedi 28 janvier 2012 à 21:20 -0500, Simon Chen a écrit :
>> Hey folks,
>>
>> To my limited knowledge, Linux currently supports 256 (255?) routing
>> tables defined in /etc/iproute2/rt_tables.
>>
>> Is there a way to increase this number to something much larger? Are
>> there performance/scalability concerns there? I am trying to have
>> customized routing table for each IP address (using "ip rule add from
>> xxx table yyy"). I am not sure exactly how many IPs I'll handle, but
>> certainly more than 255...
>>
>
> 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?

Thanks,
Ben


-- 
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc  http://www.candelatech.com
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