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

  • To: xen-users@xxxxxxxxxxxxxxxxxxx
  • From: Tom Miller <madprogextrodinr@xxxxxxxxx>
  • Date: Mon, 05 Feb 2007 10:00:35 -0500
  • Delivery-date: Mon, 05 Feb 2007 07:00:31 -0800
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  • List-id: Xen user discussion <xen-users.lists.xensource.com>

Jamie Burns wrote:

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

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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