This has me thinking that this is a PHY-layer issue. 

How long are your Ethernet runs, and are you using Cat5e cabling? 

On 2016-05-03 12:59, John Shields wrote:

> On 03/05/16 15:01, [email protected] wrote: 
> 
> It's possible that we're dealing with a memory leak somewhere.  Could you 
> watch the memory consumption of simple_ra over time? 
> 
> Also, could you just run something like uhd_fft with the same sample rate for 
> long periods to see if it gets the same 'D' treatment? 
> 
> On 2016-05-03 04:32, John Shields wrote: 
> Thanks Marcus,
> 
> Have put answers in-line.
> 
> Kind Regards,
> 
> John
> 
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 Ok, Marcus, will do. Overnight (NZ time) I got 1 D with the Atheros. I
should have said that the N200 was in the shack and the Ubuntu system in
the house. I have several runs of Ethernet out to the shack so will do
some experimentation on the different connections. Then I will move the
Ubuntu system to the shack and see if colocation helps. These
investigations will take some days but will let you know.

         Kind Regards,

                  John
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