home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
The CICA Windows Explosion!
/
The CICA Windows Explosion! - Disc 2.iso
/
nt
/
ntkb.zip
/
NTKB.EXE
/
Q106
/
4
/
34.TXT
next >
Wrap
Text File
|
1993-12-09
|
2KB
|
62 lines
DOCUMENT:Q106434 08-DEC-1993 [W_NT]
TITLE :System Clock Appears to Lose About One Second per Hour
PRODUCT :Windows NT
PROD/VER:3.10
OPER/SYS:WINDOWS
KEYWORDS:buglist3.10 fixlist3.10.003
-----------------------------------------------------------------------
The information in this article applies to:
- Microsoft Windows NT operating system version 3.1
- Microsoft Windows NT Advanced Server version 3.1
-----------------------------------------------------------------------
SYMPTOMS
========
If the time is continuously read on an x86-based Windows NT machine,
the system appears to lose a second each hour.
CAUSE
=====
The Real Time Clock (RTC) in x86-based computers has a resolution of
one second. Therefore, the Hardware Abstraction Layer (HAL) on x86
platforms uses an interval timer to increase the resolution of the
system clock into the millisecond range. Windows NT's calculation of
real time based on this interval timer is inaccurate enough that it
could get out of sync by over a second every hour.
RESOLUTION
==========
The calculations to determine the correct time for the system clock
based on the interval timer has been improved so that it remains much
closer in sync with the RTC. The system clock is still resynchronized
every hour but the size of the adjustment is negligible (at most, a
few milliseconds).
This was fixed within HAL.DLL for x86 based systems only. This is not
a concern on MIPS or Alpha platforms.
Additional reference words: 3.10
KBCategory:
KBSubCategory: ntap
=============================================================================
THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS
PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS
ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO
EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR
ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL,
CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF
MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION
OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES
SO THE FOREGOING LIMITATION MAY NOT APPLY.
Copyright Microsoft Corporation 1993.