Linux-kernel mailing list archive 1998-49,: Re: Good news for SPARC/Linux

# Re: Good news for SPARC/Linux

Jakub Jelinek (jj@sunsite.ms.mff.cuni.cz)
Thu, 10 Dec 1998 12:09:21 +0100 (CET)

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>
> >>>>> "Alex" == Alex Buell <alex.buell@tahallah.demon.co.uk> writes:
>
> Alex> On Tue, 8 Dec 1998, David S. Miller wrote:
> >> Memory: 2059720k available (1600k kernel code, 23528k data, 184k
> >> init)
>
> Alex> WTF did you put in that kernel?! 1.6MB of code and 23.5MB of
> Alex> data?!?
>
> Ever considered that it requires a bit more memory for page tables
> etc. when mapping 2GB of memory?

Page tables for the physical memory fortunately take 0B on sparc64, but even
on Intel it is far less than mem_map (on sparc64 it is 88B per 8K page, on
e.g. i386 page tables take you 4B in page tables per 4K page and 48B per 4K page
in mem_map).

Cheers,
Jakub
___________________________________________________________________
Jakub Jelinek | jj@sunsite.mff.cuni.cz | http://sunsite.mff.cuni.cz
Administrator of SunSITE Czech Republic, MFF, Charles University
___________________________________________________________________
Ultralinux - first 64bit OS to take full power of the UltraSparc
Linux version 2.1.130 on a sparc64 machine (3958.37 BogoMips)
___________________________________________________________________

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