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From: Daniel Phillips <phillips@bonn-fries.net>
To: William Lee Irwin III <wli@holomorphy.com>,
        Peter W?chtler <pwaechtler@loewe-komp.de>
Subject: Re: [PATCH] updated version of radix-tree pagecache
Date: Mon, 7 Jan 2002 13:53:12 +0100
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Cc: Christoph Hellwig <hch@caldera.de>, linux-mm@kvack.org,
        lkml <linux-kernel@vger.kernel.org>, velco@fadata.bg
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On January 7, 2002 12:03 pm, William Lee Irwin III wrote:
> On Mon, Jan 07, 2002 at 11:05:08AM +0100, Peter W?chtler wrote:
> > Can you sum up the advantages of this implementation?
> > I think it scales better on "big systems" where otherwise you end up
> > with many pages on the same hash?
> > 
> > Is it beneficial for small systems? (I think not)
> 
> I speculate this would be good for small systems as well as it reduces
> the size of struct page by 2*sizeof(unsigned long) bytes, allowing more
> incremental allocation of pagecache metadata. I haven't tried it on my
> smaller systems yet (due to lack of disk space and needing to build the
> cross-toolchains), though I'm now curious as to its exact behavior there.

Benchmark it on UML.  In my experience, performance on UML is quite predictive of 
performance on native systems.

--
Daniel
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