From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andi Kleen <andi@firstfloor.org>
Subject: Re: [RFC] fib_trie: memory waste solutions
Date: Mon, 07 Apr 2008 09:58:04 +0200
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References: <20080401172702.094c0700@extreme> <47F33D42.9080302@cosmosbay.com>
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Cc: Stephen Hemminger <shemminger@vyatta.com>,
	David Miller <davem@davemloft.net>,
	Eric Dumazet <dada1@cosmosbay.com>, netdev@vger.kernel.org
To: Robert Olsson <Robert.Olsson@data.slu.se>
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In-Reply-To: <18425.50538.876583.892728@robur.slu.se> (Robert Olsson's message of "Mon, 7 Apr 2008 08:55:38 +0200")
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Robert Olsson <Robert.Olsson@data.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