From: Steven Haigh <netwiz@crc.id.au>
To: xen-devel@lists.xen.org
Subject: Re: Time Skewing on Windows XP
Date: Tue, 12 Mar 2013 16:00:25 +1100 [thread overview]
Message-ID: <513EB669.5030802@crc.id.au> (raw)
In-Reply-To: <513EB1BC.9050803@amd.com>
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@crc.id.au
Web: https://www.crc.id.au
Phone: (03) 9001 6090 - 0412 935 897
Fax: (03) 8338 0299
next prev parent reply other threads:[~2013-03-12 5:00 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-12 4:40 Time Skewing on Windows XP Suravee Suthikulpanit
2013-03-12 5:00 ` Steven Haigh [this message]
2013-03-12 8:03 ` Jan Beulich
2013-03-14 15:16 ` Suravee Suthikulanit
2013-03-14 16:06 ` Jan Beulich
2013-03-14 16:21 ` Suravee Suthikulanit
2013-03-14 16:34 ` Jan Beulich
2013-03-14 16:38 ` Suravee Suthikulanit
2013-03-14 17:03 ` Jan Beulich
2013-03-14 16:30 ` Tim Deegan
2013-03-14 16:43 ` Jan Beulich
2013-03-14 17:08 ` Tim Deegan
2013-03-14 20:23 ` Suravee Suthikulanit
2013-03-15 8:23 ` Jan Beulich
2013-03-21 12:33 ` Tim Deegan
2013-03-21 17:05 ` Jan Beulich
2013-03-14 16:24 ` Tim Deegan
2013-03-14 16:28 ` Jan Beulich
2013-03-12 9:13 ` Paul Durrant
2013-03-12 15:55 ` Suravee Suthikulanit
2013-03-12 16:13 ` Boris Ostrovsky
2013-03-12 18:25 ` Suravee Suthikulanit
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