Daniel de Kok wrote:
On Mon, 2007-08-06 at 14:55 -0400, Johnn Tan wrote:
Assigning all the VCPUs.
Having more than one vcpu currently emits non-fatal error messages, at
least with the C5 domU kernel. I didn't have time to look into that yet.
What error messages are you seeing? On one of my machines, I
have four domU's (kernel 2.6.18-8.1.8.el5xen), each with 4
VCPUs. I don't see any errors in any of the domU's dmesg.
But /proc/cpuinfo shows they are each using all 4 CPUs.
When I try to over-assign memory though, I definitely get
errors and the domU is not created.
The Xen hypervisor requires 64MB RAM. If you don't do much work in dom0
you can set the dom0 memory fairly low. I have seen people setting it to
64 MB RAM.
Good to know. I'm a little hesitant to set it at 64MB, but I
feel a little more comfortable now bringing it further down
from the 512MB that I've been using as a dom0 minimum.
What about 32-bit v. 64-bit OS, for the dom0 and for the domU? (I'll be
using CentOS-5.) Anything else?
A 64-bit dom0 with 32-bit domUs isn't currently supported in CentOS 5,
but it it will in 5.1.
Yes, I'm looking forward to that, plus some of the other
updates in 5.1.
But I'm curious whether 32-bit domU on 32-bit dom0 is more
performant than 64-bit domU on 64-bit dom0. I'm about to do
my own test of this sometime this week, but was wondering if
others had already tried it.
johnn
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