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Re: [Discuss-gnuradio] UHD: simple_usrp and resize buffer

From: Josh Blum
Subject: Re: [Discuss-gnuradio] UHD: simple_usrp and resize buffer
Date: Sat, 19 Jun 2010 11:52:21 -0700

I have not had a chance to mess with optimization flags for msvc. If
your running cmake from the command line try
cmake -DCMAKE_CXXFLAGS:STRING="/QIfist /arch:SSE2 /G7" ../
or set those flags into CMAKE_CXXFLAGS the the gui during configure

I don't have experience with msvc optimization flags so I invite you
to experiment and report back :-) On Monday, I will push up some code
that sets the thread priority to realtime (this helps a bunch with


On Sat, Jun 19, 2010 at 6:08 AM, Damien S. <address@hidden> wrote:
> Ok. Thank you.
> I have another question. I made a simple program to receive samples from
> USRP2 with UHD. This program is a slight modification of the
> rx_timed_samples example with continuous stream mode and the full buffer
> receive mode enabled.  My problem is that even with an rx_rate of 1MHz
> packets are lost ('S' printed in the console). Am i doing something wrong ?
> (i work under Windows vista 64 bit, proc. Core 2 duo 3 Ghz each core, 8GB of
> RAM).
> Josh Blum-2 wrote:
>> RX samples per packet: 358
>> What your seeing is the print out for the number of samples per packet
>> (udp datagram). This is independent from the recv_buff_size, which is
>> the size of the socket buffer.
>> -Josh
>> On 06/14/2010 02:27 PM, Damien S. wrote:
>>> Hi all,
>>> Since a few days, i'm trying to use UHD with USRP2/WBX under Windows
>>> Vista
>>> Pro 64 bits. The rx_timed_samples example seems to work but it's
>>> impossible
>>> to change the recv_buff_size and is really problematic since its default
>>> size is very small (358 samples). Looking at the usrp_simple class it
>>> appears that the recv_buff_size parameter is not taken into account. Does
>>> somebody know a solution to fix it while continuing to use the
>>> simple_usrp
>>> interface.
>>> Thanks in advance
>>> Damien
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