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I had the same thought as George, namely that the issue is one of
the granularity of the windows default timer. <br>
<br>
I had a similar issue years ago [2007] when playing around with the
Delphi IDE, and wrote a bit about it then.<br>
<a class="moz-txt-link-freetext" href="http://www.nitehawk.com/w3sz/windowstimingissues.htm">http://www.nitehawk.com/w3sz/windowstimingissues.htm</a> <br>
<br>
I believe that you can prove the diagnosis as follows:<br>
<br>
There is a program named skedgran01.exe that runs on Windows
versions up to and including Windows 10 that shows you the timer
granularity for your system under default and high resolution
timing. This is the first link on my webpage.<br>
<br>
You can run skedgran01.exe [testing the "DefaultTiming"] both when
you are running DPC Checker and when you are not, and see if in fact
the timer granularity is affected, as George suggested, by the DPC
Checker. It is my assumption that it will be affected.<br>
<br>
I just checked to make sure all of this works on Windows 10, and it
does EXCEPT that DPC Checker won't run on Windows 10 here, even with
compatibility modes, and so I need to leave the last check to you as
outlined above.<br>
<br>
The images below will give you an idea of what to look for
[substitute "With DPC Checker" for "With YahooFinance"]:<br>
<br>
See the skedgran01.exe result here for Default timing <br>
With:
<a class="moz-txt-link-freetext" href="http://www.nitehawk.com/w3sz/DefaultTimingWithYahooFinance.png">http://www.nitehawk.com/w3sz/DefaultTimingWithYahooFinance.png</a><br>
and<br>
Without: <a class="moz-txt-link-freetext" href="http://www.nitehawk.com/w3sz/DefaultTimingBaseline.png">http://www.nitehawk.com/w3sz/DefaultTimingBaseline.png</a><br>
the Yahoo Finance page opened.<br>
<br>
Compare this with high resolution timing result<br>
With:
<a class="moz-txt-link-freetext" href="http://www.nitehawk.com/w3sz/HighResolutionTimingWithYahooFinance.png">http://www.nitehawk.com/w3sz/HighResolutionTimingWithYahooFinance.png</a><br>
and <br>
Without:
<a class="moz-txt-link-freetext" href="http://www.nitehawk.com/w3sz/HighResolutionTimingBaseline.png">http://www.nitehawk.com/w3sz/HighResolutionTimingBaseline.png</a><br>
the Yahoo Finance page opened.<br>
<br>
Also note that running Default Timing with the Yahoo Finance page
opened is NOT equivalent to running with High Resolution Timing.<br>
<br>
Please post your results back to the list!<br>
<br>
Oh, the Code Project c++ program source given in the Code Project
article linked to from my web page does compile on Win10 using
Visual Studio 2013, and it runs perfectly. But I think using the
skedgran01.exe program as outlined above is a superior approach to
figure out what is going on here.<br>
<br>
Hope the above helps, and<br>
<br>
73,<br>
<br>
Roger Rehr<br>
W3SZ<br>
<br>
<div class="moz-cite-prefix">On 12/9/2015 9:02 AM,
<a class="moz-txt-link-abbreviated" href="mailto:ghbyrkit@chartermi.net">ghbyrkit@chartermi.net</a> wrote:<br>
</div>
<blockquote cite="mid:rS2Q1r0044GYfdS01S2QmQ@chartermi.net"
type="cite">
<pre wrap="">***** High Performance Software Defined Radio Discussion List *****
</pre>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<br>
<p>I could be wrong, but I suspect that possibly running the DPC
checker (and various other multimedia software) COULD switch the
computer timing resolution from about 16 ms to 1ms or so, or
some other 'high resolution' value that allows multimedia stuff
to behave better (faster, more responsive, less subject to
latency issues)</p>
<p><br>
</p>
<p>I'm not sure how to check this, but it could explain the
results.</p>
<p><br>
</p>
<p>73,</p>
<p>George K9TRV<br>
</p>
</blockquote>
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