Re: [Xen-users] 32bit vs 64bit memory usage question

[Tom Miller <madprogextrodinr@xxxxxxxxx>]

Jamie Burns wrote:
> Hello,
>
> I recently installed a minimal 32bit version of Debian Etch, and then 
> also installed Xen from Debian's package repository.
> When Xen booted up, memory usage was just below 40MB (typical for such 
> a debian install).
> Then I decided to do the exact same install, but using the 64bit 
> version of Debian Etch and Xen.
> This time when Xen booted up, memory usage was just over 90MB - at 
> least double that of the 32bit version.
> Can anybody explain this to me? Why 64bit XEN would use double the 
> memory?
> If I try 32bit vs 64bit debian without using XEN, then memory use 
> about 30MB with each - no doubling.
> Jamie Burns.
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
64 bit pointers and 64 bit memory address slots are twice as big as
corresponding 32 bit ones.   So unless you have 4 GB of memory or more,
using 64bit software is actually slower for the system, not faster.


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