I’ve been fighting this for some time now, trying to get xen up and running so 
I can virtualize an old windows box and stuff it in my high-memory Linux 
system, but for the life of me I cannot get this thing to obey dom0_mem.

I’ve edited /etc/default/grub and ran sudo update-grub several times with 
differing settings, but it refuses to pick up the settings it appears. Here’s 
my default grub file:

GRUB_DEFAULT="Xen 4.1-amd64"
GRUB_HIDDEN_TIMEOUT=10
GRUB_HIDDEN_TIMEOUT_QUIET=false
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT=""
GRUB_CMDLINE_LINUX="apparmor=0"
GRUB_CMDLINE_XEN_DEFAULT="dom0_mem=4096M,max:4096M dom0_max_vcpus=2 
com1=115200,8n1 console=com1,vga"

Am I missing something here? I can never get the memory I want out of these 
settings… it’s as if the kernel is completely ignoring them. I’ve tried 
with/without the max segment, and all sorts of searches have turned up nothing. 
Are there XAPI settings too? I thought that /etc/xen/xend-config.sxp wasn’t in 
play with XAPI, but I could modify that!

Uh… sore forehead, anyone care to help me out here so I can issue the correct 
face palm to myself… I have to be missing something.

- Brian Menges
Principal Engineer, DevOps
GoGrid | ServePath | ColoServe | UpStream Networks

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