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Date: Wed, 27 Feb 2002 08:01:45 -0300 (BRT)
From: Rik van Riel <riel@conectiva.com.br>
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To: <m.knoblauch@teraport.de>
Cc: <Martin.Bligh@us.ibm.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: 2.4.19-preX: What we really need: -AA patches finally in thetree
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On Wed, 27 Feb 2002, Martin Knoblauch wrote:

> > > Not to begin the flamewar, but no thanks. rmap-12f blows -aa away AFAIK
> > > on this P200 w/ 64MB ram.
> >
> > rmap still sucks on large systems though. I'd love to see rmap
> > in the main kernel, but it needs to get the scalability fixed first.
> > The main problem seems to be pagemap_lru_lock ... Rik & crew
> > know about this problem, but let's give them some time to fix it
> > before rmap gets put into mainline ....
>
>  just out of curiosity: where does "large systems" start in your
> context?

My guess it would start at about 4 or 8 CPUs.

Systems which have a lot of pagetable overhead would also
suffer with -rmap, until -rmap supports pte_highmem.

regards,

Rik
-- 
"Linux holds advantages over the single-vendor commercial OS"
    -- Microsoft's "Competing with Linux" document

http://www.surriel.com/		http://distro.conectiva.com/

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