[hpsdr] CPU overload.

[Roger Rehr W3SZ]

HI Jeff,

Although your problem may well relate to CPU utilization, I was struck 
by the fact that you indicated that you are running the anniversary 
update.  I had problems with garbled transmit audio here after doing 
that update that were corrected by reverting to the prior OS version.  
Details follow.

I run both Hermes and the old Atlas/Metis/Penelope/Mercury hardware here 
[two hermes and 5 old systems] with each radio having its own computer.  
The systems are controlled remotely from an eighth computer.

The Windows 10 anniversary update [1607  14383.105] caused a problem 
with data streaming on 6 of the 7 radio computers such that my transmit 
audio was broken up intermittently.  Folks receiving my audio thought 
that I had a bad PTT connection, but the problem was that the network 
transmit audio streams were being disrupted.

I reverted from the Windows 10 anniversary update to the build that I 
was using prior to the anniversary update [1511  10586.545] and the 
problem with garbled transmit audio was cured on all 6 machines.

The 6 affected machines were all old homebrew core2duo machines. The 
unaffected radio machine was a one year old Dell.  The remote client 
machine was a homebrew I5 built last year.  I suspect that the 
difference in results on the different machines lies in the NICs.  The 
newer machines were unaffected, but all of the older machines were affected.

The Windows 10 Anniversary Update may or may not be your problem, but in 
any case it is something for others to watch out for.

I had NO other indication that there was anything wrong with the 
anniversary update in any of the machines except for this streaming 
issue on transmit.  Interestingly, I did not notice problems with the 
streamed receive audio.

These results are with my homebrew openHPSDR software [based on 
KissKonsole] so the results don't necessarily apply to other software.  
But I suspect that they do.  Fortunately, rolling back from Windows 10 
version 1607 to 1511 was simple to do, and fixed the issue for me.

73,

Roger Rehr W3SZ


On 9/10/2016 4:39 PM, Jeffrie Cook wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
>
>
> Although I've noticed this before, I've not really looked into it 
> until now; when I'm running HPSDR and open up a web browser (Chrome or 
> Edge), the speech quality becomes garbled for a few seconds.  PowerSDR 
> in its bottom left-hand corner shows CPU usage to be typically 25%, 
> Chrome whilst loading up shows a CPU usage also of 25% which rapidly 
> drops to 1%, (those last two figures I've derived from Task Manager). 
>  However during the few seconds that the web browser takes to load up 
> a page the overall CPU usage zooms up to 100%, but I cannot see what 
> is actually using the cycles, and of course it is during those few 
> seconds that speech quality becomes garbled.  Now I realise I'm 
> missing something basic, but would appreciate one of you good folks 
> pointing out to me what it is.
>
> My computer is an old (probably 10 years old) Dell OptiPlex 745 which 
> I've modified quite significantly.  I run Windows 10, the anniversary 
> edition, I have upgraded the graphics card to be Windows 10 capable, I 
> have an upgraded sound card, I have 8 GB of RAM, storage is on an SSD 
> drive, and the processor is an Intel Core 2 Quad CPU Q 6700 at 2.66 
> GHz.  The operating system is 64-bit.
>
> Despite the age of my computer, I would have thought that the 
> modifications I've done would be enough to run as above without 
> loading the CPU up to 100%.  What am I missing please.  Thank you.
>
> Jeff Cook, G0AFQ.
>
>
>
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