netdev - Re: [IPV4 0/9] TRIE performance patches

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Date:	Wed, 23 Jan 2008 15:49:33 -0800
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	Robert Olsson <Robert.Olsson@...a.slu.se>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [IPV4 0/9] TRIE performance patches

On Wed, 23 Jan 2008 15:06:47 +0100
Robert Olsson <Robert.Olsson@...a.slu.se> wrote:

> 
> Stephen Hemminger writes:
> 
>  > Time to handle a full BGP load (163K of routes).
>  > 
>  > Before:		Load		Dump		Flush
>  >
>  > kmem_cache	3.8		13.0		7.2
>  > iter		3.9		12.3		6.9
>  > unordered	3.1		11.9		4.9
>  > find_node	3.1		 0.3		1.2
> 
>  I certainly like the speed but what will we brake when
>  we don't return in longest prefix order?
> 
> labb:/# ip r
> default via 10.10.10.1 dev eth0 
> 5.0.0.0/8 via 192.168.2.2 dev eth3 
> 10.10.10.0/24 dev eth0  proto kernel  scope link  src 10.10.10.2 
> 10.10.11.0/24 dev eth1  proto kernel  scope link  src 10.10.11.1 
> 11.0.0.0/8 via 10.10.11.2 dev eth1 
> 192.168.1.0/24 dev eth2  proto kernel  scope link  src 192.168.1.2 
> 192.168.2.0/24 dev eth3  proto kernel  scope link  src 192.168.2.1 
> 
> labb:/# ip route list match 10.10.10.1
> default via 10.10.10.1 dev eth0 
> 10.10.10.0/24 dev eth0  proto kernel  scope link  src 10.10.10.2 
> labb:/# 
> 
> Maybe the unordered dump can be ordered cheaply...

Dumping by prefix is possible, but unless 32x slower. Dumping in
address order is just as logical. Like I said, I'm investigating what
quagga handles.
-- 
Stephen Hemminger <stephen.hemminger@...tta.com>
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