Re: Windows clock update frequency

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Time is not modified, but the update frequency is.

--
Maxim Shatskih, Windows DDK MVP
StorageCraft Corporation
maxim@xxxxxxxxxxxxxxxx
http://www.storagecraft.com

"Guillaume" <Guillaume@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:10046A60-2298-4917-A534-B7D806CB6474@xxxxxxxxxxxxxxxx
We have made a lot of tests, and it appears that modifying this parameter
does not impact the system time return by GetSystemTime().
So if this parameter modifies the system clock, how can I access it?
Thanks.

"Don Burn" wrote:

The implementation of timeBeginPeriod calls ExSetTimerResolution. In fact
for years that was the only approved way to access ExSetTimerResolution.
So it definitely does change the resolution system wide.


--
Don Burn (MVP, Windows DDK)
Windows 2k/XP/2k3 Filesystem and Driver Consulting
Website: http://www.windrvr.com
Blog: http://msmvps.com/blogs/WinDrvr
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"Guillaume" <Guillaume@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
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timeBeginPeriod has no impact on the clock update frequency.
I am looking for a way to increase this clock update frequency (I am NOT
looking for high precision timers). It is currently about 15 ms, and I
would
need about 1 ms. Do you know if this is possible?
Many thanks.

"Maxim S. Shatskih" wrote:

timeBeginPeriod in user mode
ExSetTimerResolution in kernel mode

--
Maxim Shatskih, Windows DDK MVP
StorageCraft Corporation
maxim@xxxxxxxxxxxxxxxx
http://www.storagecraft.com

"Guillaume" <Guillaume@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:9379D1AC-E038-4F84-BE29-458F0473F000@xxxxxxxxxxxxxxxx
Windows seems to update its internal clock every 15 ms on most
systems.
Is it possible to increase this frequency?
Indeed, it is possible to work with 1ms precision timers, so I guess
it
is
possible to increase the clock update frequency.

Does the /TIMERES boot.ini switch has an impact on this?

Thanks.
Guillaume






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