netdev - Re: [RFC] iproute2, ifindex option

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Date:	Wed, 20 Jul 2011 08:37:53 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Denys Fedoryshchenko <denys@...p.net.lb>
Cc:	<netdev@...r.kernel.org>
Subject: Re: [RFC] iproute2, ifindex option

On Mon, 18 Jul 2011 11:38:33 +0300
Denys Fedoryshchenko <denys@...p.net.lb> wrote:

>  After battling with iproute2 interface name caching, i decided to try 
>  to introduce ifindex option, where i can specify manually device index, 
>  and avoid expensive device index lookups, especially during massive 
>  changes for qdisc/class.
>  In batch mode ll_map cache will cause problems on servers with ppp 
>  interfaces (same name after while can have another index), and also if i 
>  run command too often, each start it will retrieve list of all 
>  interfaces, on 3k+ interfaces it will be CPU hog.
> 
>  This is sample of patch, just for qdisc/class/filter modify and show 
>  operation.
> 
>  Here is some changes in logic, because before qdisc code during _list 
>  operation was not checking duplicate "dev" argument, as it done in 
>  _modify code and class/filter list code.
> 
>  Also maybe i need to change duparg to something else? Because:
>  centaur iproute2-newifindex # tc/tc -s -d filter show ifindex 23 dev 
>  sdf
>  Error: duplicate "ifindex": "sdf" is the second value.
>  Or it is ok like this?
> 
>  I'm sorry that patch is not inline, seems my webmail can't do it now, i 
>  will try to install normal mail client.

If caching is a problem, I would rather just get rid of the cache altogether.
There are a number of other places where it is a problem as well.
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