[CentOS-virt] Problem with CentOS 5.3 Xen and Windows Server 2008 HVM DomU
centos at rivint.com
Mon Oct 19 19:19:20 UTC 2009
I am by no means an expert at this. I just have a lot of fresh wounds I
- Use NTP only in Xen dom0.
- Turn off NTP in Windows domU, force it to just use system time. It
will stay current from Xen, at least that is what I see here.
- Check your xm dmesg, if you are getting NMI warnings from that dom# I
am pretty sure that is the clock conflict and it bluescreens me. I fixed
it with above.
- Maybe post your domU conf file for it too. Will compare to mine. I
have been stable for a week now and the clock is running true.
- I will accept that you are using well under 4g ram as reported in
- How many vcpu's did you give dom0. I could NOT get Windows to run with
two cpus without giving dom0 MORE than one vcpu. I finally let it have
them all, I reserved cpu0 for dom0 and I have never seen it use more
than one cpu and generally it will stay there in in cpu0/vcpu0. If
anything overall performance is the same, maybe better. I do not think
SMP will work if dom0 doesn't have at least 2 cpus/vcpus at its
disposal. This is all stock Centos-Xen yum current.
- Make sure you don't have nosmp (toggled off) in your grub.conf.
- Keep your /var/lib/xen folder clean of vestiges from crashes.
Veli-Pekka Kestilä wrote:
> Ben M. wrote:
>> I had that issue when I first installed. The clock still acts up once in
>> a while if I take the system down entirely for a few hours, which won't
>> happen now that it is in the rack.
>> This seems to work for me at the moment, with or without Xen GPLPV,
>> though GPLPV "safens" your install (Registry Hive errors without it).
>> YMMV and I am not shaken out yet!
> I have also installed the GPLPV drivers. But they didn't help with
> crashes when trying to use two CPU
>> - I haven't tried a Win2K3 installation yet. So far I am very
>> disappointed with Win2K8 and I'm calling Windows Vista Server here.
>> 20gigs of partition space needed (excluding sql express) to just serve
>> the first, static, web page? Gimme a break!
> Well the W2K3 seems to work without problems. Although those virtual
> machines only use one CPU so can't know for sure.
> Memory use really isn't problem. But the issue still remains that I
> would need some way to get Windows 2008 to relax the timing requirements
> for the CPU's. So that it wouldn't do the BSOD's on the missed clock
> interrupts. And don't want to go back to 2003 as these machines will
> most probably be running next 5-years with this os.
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