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Date: Wed, 27 Feb 2002 08:11:55 -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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Message-ID: <Pine.LNX.4.33L.0202270811040.7820-100000@imladris.surriel.com>
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On Wed, 27 Feb 2002, Martin Knoblauch wrote:
> Rik van Riel wrote:
> > 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.
>
>  So, what about a Dual-Athlon system with 2-3 GB of memory? Large
> system, or just a peanut? :-)

Unless you're overburdening the system with Oracle -rmap should
run just fine.

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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