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* Clock issue in Windows XP guests
@ 2010-03-04  9:43 Gilles PIETRI
  2010-03-04 15:13 ` Zachary Amsden
  0 siblings, 1 reply; 3+ messages in thread
From: Gilles PIETRI @ 2010-03-04  9:43 UTC (permalink / raw)
  To: kvm

Hi,

I have a host running a 2.6.32.7 kernel, and I'm using qemu-kvm 0.12.2. 
I have multiple guests, and one of them is running Windows XP. If I 
stare at the clock, I see that every now & then (~5s), it slows down a 
bit, and then try to cope with it. If I run some NTP synchronization 
software like ntpd, the offset is as high as 1s lost every 10s or so, 
which makes it impossible to use anything time based on the guest (audio 
stuff, mainly).

I tried messing (as said on IRC) with the -rtc parameters, but to no 
avail. I tried the driftfix=slew option found in the --help output, but 
it says that driftfix is not a valid setting for rtc.. And anyway, I 
have no idea what this does (I'll be reading about it probably...)

I've seen something remotely connected to this on the proxmox forum, but 
it was not that helpful (and proxmox runs qemu 0.11.x as it seems):
http://forum.proxmox.com/threads/2050-Slow-clock-time-drift-in-windows-guests?p=17962

I remember using the -rtc-td-hack (and in fact, just read again about it 
here: 
http://forum.proxmox.com/threads/2381-Recommended-clock-source-for-KVM-guests), 
but it's not there anymore in 0.12.x, and I have no idea what it used to 
do (going on for some reading as well, when I have some time ;))

Oh, and the guests running linux are working just fine, and have no 
clock issue.

Has anyone encountered such a problem?

Regards,

Gilou

^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2010-03-04 15:25 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
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2010-03-04  9:43 Clock issue in Windows XP guests Gilles PIETRI
2010-03-04 15:13 ` Zachary Amsden
2010-03-04 15:25   ` Gilles PIETRI

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