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

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Date:	Mon, 26 Oct 2009 17:24:14 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
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

On Mon, 26 Oct 2009 20:03:02 -0400
Benjamin LaHaise <bcrl@...et.ca> 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.
> 
> This patch is against Linus' tree.  I'll post against net-next after a 
> bit more testing and feedback.  With 20,000 interfaces & routes, interface 
> deletion time improves from 53s to 40s.  Note that this is with other changes 
> applied to improve sysfs and procfs scaling, as otherwise those are the 
> bottleneck.  Next up in the network code is rt_cache_flush().  Comments?
> 
> 		-ben
> 

Any one doing large number of interfaces should be using FIB_TRIE?



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