Comment 39 for bug 146924

Hi Guys,

I've been doing a LOT of work on Ubuntu XEN over the last couple of weeks and now have two live stacks which are staying up and doing a lot of work.
(hopefully)

I've found there are three fundamental things you need to make clocks reliable and not have the system pause under load, these are;

a. in the Dom0's grub menu.lst, add "dom0_mem=xxx" (where xxx is for example 512 for 512M)
b. add "xen.independent_wallclock=1" to /etc/sysctl.conf in each DomU
c. add "clock=jiffies" in the DomU's .cnf file in the "extra" section

This makes a huge difference to overall usability.

hth
Gareth.