[hpsdr] O/J Power SDR CPU usage

[Chris Gerber]

Hi

I can confirm the datas.
Running here a Intel P4 3 Ghz ASUS P4C800 Motherboard Hypertread on
Installed the newes SW version 701
When using the the HPSDR interface on a 1.8 Ghz Celeron ASUS Board, I 
reach the limit
getting far above 100% when using SDR/Ozy/Janus + VAC 4.03 and Mixw or 
Multipsk


                                SDR1000 Delta M44                        
    SDR1000 Ozy/Janus

SDR Stand alone:         10 -15%                                       
         15 - 25%
SDR + Mixw               10 - 20%                                       
         20 - 30%
SDR + Mixw VAC      10 - 20%                                           
     20 - 30%
SDR + Multipsk           10 - 20%                                       
         30 - 35%

73 Chris HB9BDM            


Bill Tracey schrieb:

>***** High Performance Software Defined Radio Discussion List *****
>
>Hmmm ... not sure I follow.   I'm pretty sure the code does not spend 
>a lot of cycles multiplexing/demultiplexing the control data stream 
>from the audio data stream -- profiling would  tell for sure.
>
>My guess on the cause of the increased CPU usage is the small fame 
>size we're using on the USB bus  -- currently 512 bytes.   We might 
>get a perf boost by going to a larger frame size - the current frame 
>size goes back to the Xylo days when we had issues writing/reading 
>anything much bigger than that reliably.  We've learned a lot since 
>then and could prob get a bit of a perf boost with larger frame size.
>
>Regards,
>
>Bill (kd5tfd)
>
>At 05:03 PM 6/25/2007, Philip Covington wrote:
>  
>
>>***** High Performance Software Defined Radio Discussion List *****
>> <....snip....>
>>
>>I believe this is the big downside to mixing control data in with the
>>datastream.
>>
>>Phil N8VB
>>    
>>
>
>
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