[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Discuss-gnuradio] question on sample rate and ethernet rate

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] question on sample rate and ethernet rate
Date: Wed, 24 Apr 2019 22:08:51 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0

On 04/24/2019 10:05 PM, Achilleas Anastasopoulos wrote:
Hi all,

I am trying to figure out what I am doing/thinking wrong in the following example:

I have a simple flowgraph with a complex source sending samples to USRP.
The sample rate is fs=200e6/32=6.25 Msps which is the parameter that I set in the USRP.

I assume that this parameter will result in fs x 8 = 50 MBytes/sec transmission over the ethernet (2 complex samples and float32 (4 bytes) each. This is the format that I have set in USRP).

However, when I observe the transmission rate on the system monitor (Ubuntu Linux) it reports a sustained rate of exactly half of it, ie, 25 MBytes/sec.

I cannot figure out what I am doing wrong and I get this factor of 2 mismatch. All the above is run in an ubuntu box with gnuradio maint-3.7 installed and uhd 3.14.0

thanks in advance for any explanation,

The over-the-wire format is 16-bits I, 16-bits Q. There is no floating-point over-the-wire.

reply via email to

[Prev in Thread] Current Thread [Next in Thread]