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[Xen-users] Xen3.0.0 Dom0 >80M Reserved

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Xen3.0.0 Dom0 >80M Reserved
From: Goetz Bock <bock@xxxxxxxxxxx>
Date: Wed, 4 Jan 2006 18:08:00 +0100
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Dear list,

after upgrading my server to 3GB (as it would not take 4GB :-(, the BIOS
only counts to 3.5GB) I realised that when the Dom0 kernel boots, 
something reserves over 80M:

Memory: 136060k/221184k available (1562k kernel code, 84432k reserved, 586k data
, 128k init)

Can someone enlight me what takes the memeory? The Xen hypervisor get's
about 48MB of it's own.

I'm running Debian 3.1 (sarge) on a dual-core AMD Athlon X2 and use the
binary distribtion of Xen with my own kernel for Dom0. Actually the
default Dom0 kernel, but with some more drivers enabled (e.g. ForcedETH,
3ware ...). The Board is a Tyan Tomcat K8E (S2865).

server:~# xm info
system                 : Linux
host                   : server
release                : 2.6.12.6-xen0
version                : #6 Mon Dec 19 15:43:38 UTC 2005
machine                : x86_64
nr_cpus                : 2
nr_nodes               : 1
sockets_per_node       : 1
cores_per_socket       : 2
threads_per_core       : 1
cpu_mhz                : 2009
hw_caps                : 
178bfbff:e3d3fbff:00000000:00000010:00000001:00000000:00000003
total_memory           : 3071
free_memory            : 2816
xen_major              : 3
xen_minor              : 0
xen_extra              : .0
xen_caps               : xen-3.0-x86_64
platform_params        : virt_start=0xffff800000000000
xen_changeset          : Sun Dec  4 17:24:24 2005 +0100
8240:64cd054aa143
cc_compiler            : gcc version 3.4.4 20050721 (Red Hat 3.4.4-2)
cc_compile_by          : xenod
cc_compile_domain      : cl.cam.ac.uk
cc_compile_date        : Sun Dec  4 20:18:33 GMT 2005
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