[CentOS-virt] Xen network problem

Ben M. centos at rivint.com
Fri Oct 30 22:58:05 UTC 2009

Haven't loaded up win 2003 vms yet. So I don't have a good test case yet.

I haven't tried to repeat it in the last two kernel updates, in part 
because I didn't think it was an issue, I thought it was a matter that 
if you are going to do smp, you need at least two cpus booting up and 
coming into the dom0 to "activate" that in the kernel. Sorta like making 
babies, heh. I did try to assign it two vcpus and limited it to on cpu, 
but that had the same effect as going out on a date by yourself. No babies.

Both xm list and going into the Windows 2008 showed showed only 1 "cpu" 
present, available and taken. Rebooting a couple of times with 1 or more 
than one, convinced me to boot with more than one. Later I found I could 
xm vcpu-set and so forth and everything ran fine. I may script that up 
to run after startup. No harm in this requirement to me.

Christopher G. Stach II wrote:
> ----- "Ben M." <centos at rivint.com> wrote:
>> Not trying to take this off-topic, I think it is relevant.
>> Christopher: When I booted up with dom0-cpus 1, Windows 2008 could not
>> "find" its second cpu. However, once up, I can "xm or virt-manager" it
>> down to 1 cpu on cup 0 and everything is fine.
>> Is this a unique issue or do you have a tweak or hack to force smp
>> with dom0 on one cpu?
> I haven't run across that personally and I don't have any 2008 guests at the moment to try it with. Did ``xm list'' show it as having multiple CPUs when the guest thought it only had one? Does it happen with 2003 or any other HVM guests?

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