[PVE-User] System hangs / CPU 100% Windows 2008 Server

Alexandre DERUMIER aderumier at odiso.com
Thu Sep 6 07:49:27 CEST 2012

>> What is "args: -no-hpet" good for? 
IT's about internal timer, you can have timedrift without it. But proxmox add it if you choose win8K,win7,... as ostype.

For virtio, do you use last drivers here ? :

About your hardware:

Do you use hyperthreading ? (It's always better to desactivate it).
How many real cores do you have ? (without hyperthreading)
Do you have some kind of dynamic processor frequency ? (you need to set bios to max performance)
Desactivate features like speepstep, c1e

----- Mail original ----- 

De: "Martin Schuchmann" <ms at city-pc.de> 
À: "Alexandre DERUMIER" <aderumier at odiso.com> 
Cc: "Massimo Santoro" <massimo at tuxel.com>, pve-user at pve.proxmox.com 
Envoyé: Mercredi 5 Septembre 2012 17:20:12 
Objet: Re: [PVE-User] System hangs / CPU 100% Windows 2008 Server 

Hi Alexandre, 

The /etc/pve/qemu-server/402.conf does not contain any args: entry yet. 

What is "args: -no-hpet" good for? 

We used "Microsoft Windows Vista/2008 (w2k8)" as OS-type. When we tried 
a "Microsoft Windows 7/2008r2 (win7)" install, there occured different 
errors during the installation - but no worry on that, since it really 
is a non-r2 guest. 

It is an 64bit with 12GB RAM and 8 Cores. Writing this email I get 
another thought: We upgraded a few weeks ago the vCPU-Cores from 4 to 8 
I think, and since we did that, the frequency of the freezes seems to 
rise from 3-4 weeks to at least every 10 days now. 

We used the ide mode for some testing, but then decide to use the virtio 
since they seemed to be faster - and more reliable. But these decision 
was made during the first steps with proxmox, so maybe we did not get 
the real causes for the problems we have had. 

I will update the BIOS again (will have to move the guests first, and 
should do the bios update only locally in the data center...) - and then 
maybe change to IDE Mode. Did you ever try to change back from virtio to 
ide? Does this work without a fresh install? 

Thank you for your time spending here! 

Regards, Martin 

Alexandre DERUMIER <aderumier at odiso.com> schrieb am 05.09.2012 15:52: 
>>> Also, have you tried to put "args: -no-hpet" in the vm config file? 
> -no-hpet is already passed if you use win7/win2008 ostype in your vm config file 
> Also is it win2008 32bit or x64 ? 
> ----- Mail original ----- 
> De: "Massimo Santoro" <massimo at tuxel.com> 
> À: "Martin Schuchmann" <ms at city-pc.de> 
> Cc: pve-user at pve.proxmox.com 
> Envoyé: Mercredi 5 Septembre 2012 14:37:15 
> Objet: Re: [PVE-User] System hangs / CPU 100% Windows 2008 Server 
> On 05/09/2012 13:52, Martin Schuchmann wrote: 
>> Hi Massimo, 
>> Thanks for that advice! 
>> I have checked the bios and according to HP Support it is already a 
>> corrected version from May 2011. 
>> I think if it would be caused by a hardware error, the problem would 
>> occur on other guests on this host also, or the complete host should 
>> freeze up? 
>> On the same machine is a Win 2008 SBS running - for 6 month without 
>> any error. 
>> The node which is freezing is used as a Terminalserver with about 5-10 
>> active Users. 
> We have several win2008 std (not r2) installations. Many of them 
> suffered of system hangs (blue screen) or cpu 100% hangs while other 
> guests were still running fine. Updating the bios solved all those issues. 
> We found out though that the most stable setup is using IDE and e1000 
> (no virtio devices). Have you tried this? 
> Also, have you tried to put "args: -no-hpet" in the vm config file? 
> Massimo Santoro 

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