Re: [coLinux-users] Very large time offset in coLinux

[Robert I. <and...@ho...>]

Have u looked at this http://support.microsoft.com/kb/274323. It mentions a method to check for jumps by comparing gettickcount and the results of queryperformancecounter. It reckons the problem is due to a fault in the south bridge.

Other sources say that the value returned can differ on each core in a multicore setup, avoided using an affinity mask

--
Sent from my Nokia N900

----- Original message -----
>
> Hi Shai,
>
> My Windows servers run with standard power options (always on, no
> hibernation).
>
> The frequency returned from QueryPerformanceFrequency "cannot change
> while the system is running" (from MSDN). If it did change then it could
> explain the problem, but since the Windows host is running OK, I assume
> that the root cause is different.
>
> Ron
>
> Date: Fri, 3 Sep 2010 12:43:04 +0300
> Subject: Re: [coLinux-users] Very large time offset in coLinux
> From: sva...@gm...
> To: hen...@ar...
> CC: ra...@ho...; col...@li...
>
> Hi Henry and Ron,
> Just to verify, I have duplicated this problem on my PC as well. This
> appears to be related to the selected Power Options settings (Control
> Panel, Power Options). I believe this can also happen if you have a
> variable frequency CPU as the time calculation is performed using
> QueryPerformanceCounter which counts CPU cycles and not time.
>
> Ron, can you verify this by disabling power options in your host?
> Thanks,
> - Shai
>
>

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