netdev - Re: [RFC] fib_trie: memory waste solutions

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Date:	Mon, 7 Apr 2008 16:42:35 +0200
From:	Robert Olsson <Robert.Olsson@...a.slu.se>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Robert Olsson <Robert.Olsson@...a.slu.se>,
	Stephen Hemminger <shemminger@...tta.com>,
	David Miller <davem@...emloft.net>,
	Eric Dumazet <dada1@...mosbay.com>, netdev@...r.kernel.org
Subject: Re: [RFC] fib_trie: memory waste solutions


Andi Kleen writes:

 > >  Do we get slower with vmalloc due to TLB-lookups etc? Guess this
 > >  should be investigated.
 > 
 > In some cases it might even go faster because a lot of x86 CPUs
 > have far more 4K TLBs than 2M TLBs. vmalloc is just quite expensive
 > in setup/free time, but that shouldn't be a big issue here.


 I've did some rDoS testing and the lookup performance is the same or 
 slightly better. So it should be fine.  


 Cheers
					--ro

 

  
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