I am not using grub2; using grub-legacy instead.
Also, once the dom0 boots up I do have to set the dom0 mem to:
(1) xm mem-set 0 12000 (otherwise when starting up a lot of domU it
would run out of memory)
and
(2) echo 1548576 > /proc/sys/fs/aio-max-nr
My /boot/grub/menu.lst (pasted relevant lines)
**************************************************
root@MESL-BlackBox:/usr/src# cat /boot/grub/menu.lst
# menu.lst - See: grub(8), info grub, update-grub(8)
# grub-install(8), grub-floppy(8),
# grub-md5-crypt, /usr/share/doc/grub
# and /usr/share/doc/grub-doc/.
## default num
# Set the default entry to the entry number NUM. Numbering starts from 0,
and
# the entry number 0 is the default if the command is not used.
#
# You can specify 'saved' instead of a number. In this case, the default
entry
# is the entry saved with the command 'savedefault'.
# WARNING: If you are using dmraid do not use 'savedefault' or your
# array will desync and will not let you boot your system.
default 0
## timeout sec
# Set a timeout, in SEC seconds, before automatically booting the default
entry
# (normally the first entry defined).
timeout 20
### BEGIN AUTOMAGIC KERNELS LIST
## lines between the AUTOMAGIC KERNELS LIST markers will be modified
## by the debian update-grub script except for the default options below
## DO NOT UNCOMMENT THEM, Just edit them to your needs
## ## Start Default Options ##
## default kernel options
## default kernel options for automagic boot options
## If you want special options for specific kernels use kopt_x_y_z
## where x.y.z is kernel version. Minor versions can be omitted.
## e.g. kopt=root=/dev/hda1 ro
## kopt_2_6_8=root=/dev/hdc1 ro
## kopt_2_6_8_2_686=root=/dev/hdc2 ro
# kopt=root=UUID=909f7c32-639a-469d-b34b-b418d2b6a2dc ro
## default grub root device
## e.g. groot=(hd0,0)
# groot=909f7c32-639a-469d-b34b-b418d2b6a2dc
## should update-grub create alternative automagic boot options
## e.g. alternative=true
## alternative=false
# alternative=true
## should update-grub lock alternative automagic boot options
## e.g. lockalternative=true
## lockalternative=false
# lockalternative=false
## additional options to use with the default boot option, but not with
the
## alternatives
## e.g. defoptions=vga=791 resume=/dev/hda5
# defoptions=quiet splash
## should update-grub lock old automagic boot options
## e.g. lockold=false
## lockold=true
# lockold=false
## Xen hypervisor options to use with the default Xen boot option
# xenhopt=dom0_max_vcpus=1 dom0_mem=8192
## Xen Linux kernel options to use with the default Xen boot option
# xenkopt=console=tty0
## altoption boot targets option
## multiple altoptions lines are allowed
## e.g. altoptions=(extra menu suffix) extra boot options
## altoptions=(recovery) single
# altoptions=(recovery mode) single
## controls how many kernels should be put into the menu.lst
## only counts the first occurence of a kernel, not the
## alternative kernel options
## e.g. howmany=all
## howmany=7
# howmany=all
## specify if running in Xen domU or have grub detect automatically
## update-grub will ignore non-xen kernels when running in domU and vice
versa
## e.g. indomU=detect
## indomU=true
## indomU=false
# indomU=detect
## should update-grub create memtest86 boot option
## e.g. memtest86=true
## memtest86=false
# memtest86=true
## should update-grub adjust the value of the default booted system
## can be true or false
# updatedefaultentry=false
## should update-grub add savedefault to the default options
## can be true or false
# savedefault=false
## ## End Default Options ##
title Xen 4.0.0 / Debian GNU/Linux, kernel 2.6.31.13
root (hd0,0)
kernel /boot/xen-4.0.0.gz
module /boot/vmlinuz-2.6.31.13 root=/dev/sda1 ro
title Xen 3.4.2 / Debian GNU/Linux, kernel 2.6.31.8-xenapr2010
root (hd0,0)
kernel /boot/xen-3.4.2.gz
module /boot/vmlinuz-2.6.31.8-xenapr2010 root=/dev/sda1 ro
console=tty0
module /boot/initrd.img-2.6.31.8-xenapr2010
### END DEBIAN AUTOMAGIC KERNELS LIST
Please paste your dom0 grub.conf.
Are you using memory ballooning?
-- Pasi
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