[USRP-users] E310 - Maximal rate for rx_samples_to_file example
Kyle A Logue
kyle.a.logue at aero.org
Mon Mar 21 12:22:57 EDT 2016
I have successfully used the following higher sample rates on an E310:
* 6 MSPS in 2 second intervals to Metafile on PNY Turbo Performance 64GB UHS-3 SD Card
* 16 MSPS in 170ms intervals to /var/volatile/tmp every 2 seconds, then moved to SD Card
Trying to get data off via Ethernet is a fool's errand, so don't bother. I haven't tested the newest Sandisk Extreme Plus SD Cards, but they may be faster.
Kyle Logue · The Aerospace Corporation · ETG-DCID · Senior MTS · 310.336.3038 · kyle.logue at aero.org<mailto:kyle.logue at aero.org>
From: USRP-users <usrp-users-bounces at lists.ettus.com> on behalf of James Humphries via USRP-users <usrp-users at lists.ettus.com>
Sent: Monday, March 21, 2016 08:09
To: Claudio Cicconetti
Cc: USRP-users at lists.ettus.com
Subject: Re: [USRP-users] E310 - Maximal rate for rx_samples_to_file example
In addition to Claudio's suggestion, keep in mind that a 1MHz sampling rate is already approaching the max write speed of the micro-sd card. It may not be able to sustain those write speeds for very long.
At 1 MS/s,
1 MS/s * 4 bytes/float * 2 floats/sample = 8 MB/s.
This doesn't consider that the OS is also loaded from the SD card and may be consuming some time reading/writing to the SD card as well.
On Mon, Mar 21, 2016 at 9:10 AM, Claudio Cicconetti via USRP-users <usrp-users at lists.ettus.com<mailto:usrp-users at lists.ettus.com>> wrote:
Did you try the --null option? It will do everything except storing the
samples, just in case you suspect the issue may have something to do
with the actual writing part.
On 03/21/2016 11:37 AM, ???? via USRP-users wrote:
> What is the maximal sampling rate possible for sampling to a file without getting overflows (E310)?
> I ran the rx_samples_to_file example on the E310 with the default sampling rate (1MHz), and after about a minute I started getting overflows ("O"s).
> Additional info:
> 1. The E310 image is "fido-rfnoc-test" (http://files.ettus.com/e3xx_images/alpha/fido-rfnoc-test/)
> 2. The FPGA image is "uhd-images_003.010.rfnoc-282-gab4e9eaa" (http://files.ettus.com/binaries/images/)
> 3. The "rx_samples_to_file" example was cross-compiled from "rfnoc-devel" branch (https://github.com/EttusResearch/uhd/tree/rfnoc-devel), following the instructions in http://files.ettus.com/manual/page_usrp_e3x0.html#e3x0_sdk.
> 4. The micro SD card is UHS speed class 1 (10MB/s).
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