netdev - Re: keeping ifindex in 16bits or does it have to be sparse?

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Message-ID: <49D235C2.3050208@candelatech.com>
Date:	Tue, 31 Mar 2009 08:24:50 -0700
From:	Ben Greear <greearb@...delatech.com>
To:	Jeremy Jackson <jerj@...lanar.net>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: keeping ifindex in 16bits or does it have to be sparse?

Jeremy Jackson wrote:
> The question came up when profiling Quagga... a performance issue occurs
> because it's iterating over a linked list of interface structures... and
> this person is using 2000 interfaces for ADSL PPPoE server.  It's an
> interesting use case.
>
> There are 2 options to make the interface lookup in quagga scale: array
> or hash.  My first thought was array, but it seems that ifindex can get
> sparse, that is, the largest ifindex can be much bigger (eg 408589) the
> number of max number of interfaces.
>
> So question to netdev, is it possible to reuse ifindex eventually, so it
> won't keep growing with interface add/delete, and are there
> (unnecessary) large jumps in the allocation sequence?
>   
Please use a hash...I'm sure someone will have a use-case with more than 
64k interfaces
sometime soon.

Ben

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


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