there is a problem with most versions of the uvnc server. a call to initSDTimer results in setting the internal o/s system timing
resolution to its minimum period. this means more than 1000 interrupts per second. this is a problem on windows xp and
windows 7. this setting remains in force as long as the server is running.
the effect of this is serious for platforms with realtime requirements as well as platforms with limited power resources.
it is not clear why the standard timing resolution (about 16 milliseconds) not sufficient for the server's needs.
can this be fixed or patched?
many thanks for your attention to this...
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A new stable version, UltraVNC 1.6.4.0 and UltraVNC SC 1.6.4.0 have been released: https://forum.uvnc.com/viewtopic.php?t=38095
Feedback is always welcome
2025-12-05: Celebrating the 23th anniversary of the UltraVNC (26th anniversary since the laying of the foundation stone): https://forum.uvnc.com/viewtopic.php?t=38130
2025-12-03: Could you please complete our poll/survey? Renaming UltraVNC files and service to be more clear: https://forum.uvnc.com/viewtopic.php?t=38128
There was a problem to vote, it is solved now! Thanks in advance!
2025-12-02: We need help: English Wikipedia UltraVNC page has been requested to deletion: https://forum.uvnc.com/viewtopic.php?t=38127
Any help is welcome to improve the UltraVNC page and/or to comment on the Wikipedia Talk page
2025-05-06: Forum password change request: https://forum.uvnc.com/viewtopic.php?t=38078
2023-09-21: Important: Please update to latest version before to create a reply, a topic or an issue: https://forum.uvnc.com/viewtopic.php?t=37864
Development: UltraVNC development is always here... Any help is welcome
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unnecessarily fine system timer resolution
- Rudi De Vos
- Admin & Developer

- Posts: 6978
- Joined: 2004-04-23 10:21
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Re: unnecessarily fine system timer resolution
Version with SDTimer removed
http://www.uvnc.eu/download/1204/winvnc_SDtimer.zip
http://www.uvnc.eu/download/1204/winvnc_SDtimer.zip
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