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Today's Topics:
1. Re: Running Ubuntu/UHD from external USB 3 drive (David Daugherty)
2. Re: B210 theory (Mike Jameson)
----------------------------------------------------------------------
Message: 1
Date: Sat, 12 Apr 2014 09:53:15 -0700
From: "David Daugherty" <[email protected]>
To: "'Matt Ettus'" <[email protected]>, "'Robert Kossler'"
<[email protected]>
Cc: [email protected]
Subject: Re: [USRP-users] Running Ubuntu/UHD from external USB 3 drive
Message-ID: <[email protected]>
Content-Type: text/plain; charset="us-ascii"
Hi Robert,
We recently went through a similar exercise with an Intel NUC that has 4 USB
3 ports, added USB 3 1TB passport drive and 2 B200s (one for transmit and
one for receive) running Ubuntu 12.04. Our experience was that at high
sampling rates (say above 8 MSPS) we had chronic problems with overruns and
underruns. Finally we added a 120 GB Intel solid state drive where we also
installed the O/S.
When we wanted to send and receive at high speeds we increased the ram disk
size:
Increase tmpfs (ram disk) size...
sudo mount -o remount,size=4G tmpfs /run/
We then performed our tests, capturing the results to a directory on the ram
disk. After the tests we could copy the results elsewhere- let's say the
passport drive and clear out the ram disk in preparation for the next test.
Dave
From: USRP-users [mailto:[email protected]] On Behalf Of
Matt Ettus
Sent: Friday, April 11, 2014 11:50 PM
To: Robert Kossler
Cc: [email protected]
Subject: Re: [USRP-users] Running Ubuntu/UHD from external USB 3 drive
Robert,
If the hard drive and the B200 are on the same USB3 interface they will end
up sharing bandwidth. Depending on the data rates you want, this may be a
problem. Sharing for the boot drive is probably less of an issue, but
storing samples to disk is going to be harder. USB3 performance is highly
dependent on chipset, so it is hard to give you numbers without testing your
particular configuration.
Matt
On Tue, Apr 8, 2014 at 8:25 AM, Robert Kossler <[email protected]>
wrote:
I am considering installing Ubuntu Linux and the UHD driver on an External
USB 3.0 drive (Buffalo Drive Station DDR) rather than installing on an
internal drive. This would allow me to run the software from any PC
(without needing to install a local copy of the OS/driver). This is in
regard to using a B210 product.
I know that the Ettus page includes a link for a LiveUSB SDR environment
that could be downloaded and installed. I also know that GNU Radio has an
GNURadioLiveDvd that is a bootable DVD.
The purpose of this post is to find out if anyone has any tips / advice on
this process.
1) My initial thought is that I would not use the LiveUSB download
because the OS is 32 bit and the software might not be the latest. So, I
planned to install Ubuntu 13.10 64 bit, the UHD driver, & GNU radio
"manually".
2) I am wondering if anyone has experience running from an External USB
3.0 drive with regard to performance. Given that the USB 3.0 interface is
5Gb max speed, it seems that performance might be reasonably good if the
drive itself has a pretty good USB 3 design.
a. One application I plan to use is streaming raw RX data to hard
drive. Since my destination for the raw data is my USB 3 hard drive, I know
that I will be limited by the write speed of this interface. However, I'm
wondering by installing the OS & software on this same USB 3 hard drive, I
will limit my performance even more. In other words, would I be better off
with the OS & software running from an internal SATA drive if the
application is to stream B210 data from one USB3 interface to the USB 3 hard
drive on the 2nd USB 3 interface?
Thanks.
Rob
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Message: 2
Date: Sun, 13 Apr 2014 16:15:30 +0100
From: Mike Jameson <[email protected]>
To: Dmitry Dmitry <[email protected]>
Cc: "[email protected]" <[email protected]>
Subject: Re: [USRP-users] B210 theory
Message-ID:
<CAJcjmiSqdXo+05o5jwM6i0WP=X9ekZ0MSyd0=rdei_qben8...@mail.gmail.com>
Content-Type: text/plain; charset="koi8-r"
Dmitry,
UHD is used to set the RX/TX lo_offset. With GRC, use the following line
in the 'UHD Source' block's 'Center Freq' box:
uhd.tune_request(center_freq, rf_freq=(center_freq +
lo_offset),rf_freq_policy=uhd.tune_request.POLICY_MANUAL)
You need to define the 'center_freq' and 'lo_offset' variables for this to
work.
The UHD docs are here for further info on its capabilities:
http://files.ettus.com/uhd_docs/doxymanual/html/
Mike
--
Mike Jameson M0MIK BSc MIET
Email: [email protected]
Web: http://scanoo.com
On Tue, Apr 8, 2014 at 8:49 AM, Dmitry Dmitry <[email protected]> wrote:
>
>
>
>
> Hi Dmitry -
>
> Can you share with us what you are trying to accomplish? It would help us
> focus our answers on the information that would be most helpful to you.
>
> Cheers,
> Ben
>
> Hello,
>
> Sorry for the stupid subject. I need some theoretical inquiry into the
> structural scheme. At this moment I dont have a B210 platform, but I need
> to know which part of this system controls the analog elements of the
> AD9361 and where its located. For example, I need to change Rx_LO
> frequency. What elements of the system, signal pass through. (PC->UHD
> FPGA->SPI bus->AD9361 SPI Regs?)
> Sorry for my english, Its my second language.
>
>
> Hi, Ben.
>
> We trying to build a communication system for radio control of the mobile
> object in LDP433. We started with a theoretical description of the problem.
> And I need some block (schematic) diagram, which explain, how control
> command reaches the analog part of B210 (i mean AD9361) and change its
> parameters (for example, tuning of the RX_LO and TX_LO ).
> I have a block digram thats shows all main block of AD9361, and then FPGA
> with some DSP blocks and USB interface with PC, but i have no blocks that
> shows control part. I need to know what elements of software (Linux
> GNUradio? command line?,UHD?, API driver?) and hardware (FPGA? MicroBlaze?,
> interfaces?) involved in the transfer of control commands to AD9361.
> Sorry if poorly explained.
>
> Best Regards.
>
>
> <http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com><http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com>
>
>
> _______________________________________________
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> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
>
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