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

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Message-ID: <87bq4mrt9v.fsf@basil.nowhere.org>
Date:	Mon, 07 Apr 2008 09:58:04 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Robert Olsson <Robert.Olsson@...a.slu.se>
Cc:	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

Robert Olsson <Robert.Olsson@...a.slu.se> 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.

The memory savings are impressive.

-Andi

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