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