Date: Mon, 7 Jun 2004 21:29:49 +0200 From: Alexander Leidinger <Alexander@Leidinger.net> To: Alan Cox <alc@cs.rice.edu> Cc: current@freebsd.org Subject: Re: comments in the page coloring options in /sys/conf/NOTES Message-ID: <20040607212949.2f7997d9@Magellan.Leidinger.net> In-Reply-To: <20040607174933.GK24461@cs.rice.edu> References: <20040606142446.2900a97e@Magellan.Leidinger.net> <20040606201249.GH24461@cs.rice.edu> <20040607130430.0ebbbb8e@Magellan.Leidinger.net> <20040607174933.GK24461@cs.rice.edu>
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On Mon, 7 Jun 2004 12:49:33 -0500
Alan Cox <alc@cs.rice.edu> wrote:
> > vm_page.h contains:
> > ---snip---
> > #if PQ_CACHESIZE >= 1024
> > #define PQ_PRIME1 31 /* Prime number somewhat less than PQ_HASH_SIZE */
> > #define PQ_PRIME2 23 /* Prime number somewhat less than PQ_HASH_SIZE */
> > #define PQ_L2_SIZE 256 /* A number of colors opt for 1M cache */
> > ---snip---
> >
> > The three defines seem to be the tunables for the page coloring, but
> > neither of them seem to be near cache_size/page_size. So even for the
> > direct mapped case this doesn't seem to fit your explanation.
>
> Actually, it does. Divide 1MB (the cache size) by 4KB (the page size)
Ooops... I had a different number for the page size in my mind...
> > ... Is it as
> > easy as using appropriate values for those defines at boot time or is
> > there more work involved for auto-tuning version?
>
> At boot time.
That was not my the question...:
Do we need to change only places where those defines are used or are
other changes required too?
Bye,
Alexander.
--
I'm available to get hired (preferred in .lu).
http://www.Leidinger.net Alexander @ Leidinger.net
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