netdev - Re: [RFC PATCH] fib_hash: improve route deletion scaling on interface drop with lots of interfaces

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Date:	Tue, 27 Oct 2009 23:07:57 +0200 (EET)
From:	Julian Anastasov <ja@....bg>
To:	Benjamin LaHaise <bcrl@...et.ca>
cc:	netdev@...r.kernel.org
Subject: Re: [RFC PATCH] fib_hash: improve route deletion scaling on interface
 drop with lots of interfaces


	Hello,

On Mon, 26 Oct 2009, Benjamin LaHaise wrote:

> Hi folks,
> 
> Below is a patch to improve the scaling of interface destruction in 
> fib_hash.  The general idea is to tie the fib_alias structure into a 
> list off of net_device and walk that list during a fib_flush() caused 
> by an interface drop.  This makes the resulting flush only have to walk 
> the number of routes attached to an interface rather than the number of 
> routes attached to all interfaces at the expense of a couple of additional 
> pointers in struct fib_alias.

	May be this can not work for multipath routes because
you consider only the first device (fib_dev). Also nh_dev is
optional, not every route has device, so you should add checks
for dev ! NULL.

> @@ -516,6 +517,10 @@ static int fn_hash_insert(struct fib_table *tb, struct fib_config *cfg)
>  	new_fa->fa_type = cfg->fc_type;
>  	new_fa->fa_scope = cfg->fc_scope;
>  	new_fa->fa_state = 0;
> +	new_fa->fa_fib_node = f;
> +	new_fa->fa_fz = fz;
> +
> +	dev = fi->fib_dev;

Regards

--
Julian Anastasov <ja@....bg>

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