Re: [Xen-devel] Time Skewing on Windows XP

[Steven Haigh <netwiz@xxxxxxxxx>]

On 03/12/2013 03:40 PM, Suravee Suthikulpanit wrote:
> Hi,
>
> While I was investigating the following issue on Windows XP (both 32-bit
> and 64-bit):
>
> * AMD NPT performance regression after c/s 24770:7f79475d3de7
>     Reference:http://marc.info/?l=xen-devel&m=135075376805215
>
>
> On the latest source form xen-unstable, I ran into an issue where the
> timing on the HVM guests skewing about 2x slower than the actual wall
> clock time.  This results in the system time slowing down. This is
> regardless of the cpufreq governor scaling. (I tried with both ondemand
> and performance).
>
> However, I don't see the same behavior on the Win7 HVM guests. Is this a
> known issue. I assume that XP and Win7 uses different mechanism for
> keeping time (e.g. rdtsc vs. HPET)?
I found this recently as well... I didn't managed to come across a 
solution - however mine is on an Intel CPU. In the end, I just gave up 
and installed an NTP client on the WinXP systems. This updated the clock 
every hour so it doesn't drift enough to worry about anymore.
If I disable this, it drifts a few hours each day.

--
Steven Haigh

Email: netwiz@xxxxxxxxx
Web: https://www.crc.id.au
Phone: (03) 9001 6090 - 0412 935 897
Fax: (03) 8338 0299

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