[pve-devel] timedrift on win7/2008 with hpet timer

[Alexandre DERUMIER]

Thanks ! (didn't have time to make the patch)


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

De: "Dietmar Maurer" <dietmar at proxmox.com> 
À: "Alexandre DERUMIER" <aderumier at odiso.com>, pve-devel at pve.proxmox.com 
Envoyé: Jeudi 5 Avril 2012 12:38:20 
Objet: RE: [pve-devel] timedrift on win7/2008 with hpet timer 

ok, fixed it. 

> -----Original Message----- 
> From: pve-devel-bounces at pve.proxmox.com [mailto:pve-devel- 
> bounces at pve.proxmox.com] On Behalf Of Alexandre DERUMIER 
> Sent: Dienstag, 03. April 2012 17:02 
> To: pve-devel at pve.proxmox.com 
> Subject: [pve-devel] timedrift on win7/2008 with hpet timer 
> 
> Hi, 
> 
> users reports some time drifts problem with win7 and win2008 guests. 
> http://forum.proxmox.com/threads/8943-Time-running-fast-after-upgrading- 
> to-PVE-2-final 
> 
> from wikipedia: 
> http://en.wikipedia.org/wiki/High_Precision_Event_Timer 
> 
> not able to use HPET: Windows XP sp2,[note 2] Windows Server 2003, and 
> earlier Windows versions able to use HPET: Windows XP sp3,Windows 2008, 
> Windows Vista, Windows 7 
> 
> The problem seem to be that HPET timer doesn't have timedrift compensation in 
> current kvm 
> 
> I also check on the redhat side, they disable hpet by default (-no-hpet) since 
> 2010 
> https://bugzilla.redhat.com/show_bug.cgi?id=595130 
> 
> 
> default redhat libvirt config for timers: 
> 
> 
> <clock mode="localtime"> 
> <timer name="rtc" tickpolicy="catchup" wallclock="guest" /> 
> <timer name="pit" tickpolicy="none" /> 
> <timer name="hpet" present="no" /> 
> </clock> 
> 
> give 
> 
> 
> -clock base=localtime,clock=guest,driftfix=slew 
> -no-kvm-pit-reinjection 
> -no-hpet 
> 
> 
> maybe could it good to add -no-kvm-pit-reinjection -no-hpet by default for 
> win7,win2008 guests ? 
> 
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