Re: [Discuss-gnuradio] Intel Atom Processor

[Tom Rondeau]

On Fri, Oct 8, 2010 at 3:46 PM, Sharif Shaher <address@hidden> wrote:
>  In both instances you guys were doing more than what we hoped to do, we
> are not going to demod nor run an FFT, just store the data to disk....given
> that
> do you still see a problem with 2 USRP2s, 4 USRP2s, 6 USRP2s using a 1.6 GHz
> atom?


This is why I gave you a bit of an upper bound beyond what I was
doing. I was doing a bit more calculation and only getting 1.2 MHz. No
way are you going to be able to do much more than that even just
writing to disk.

Also, see the other ongoing thread discussing limitations of writing
to disk. Even if you could stream in from multiple USRP2s with a
decimation of 4, you still have the problem of writing all of that
data.

Tom



> On 10/8/2010 3:08 PM, Tom Rondeau wrote:
>>
>> On Fri, Oct 8, 2010 at 2:54 PM, Marcus D. Leech<address@hidden>  wrote:
>>>
>>> On 10/08/2010 02:46 PM, Sharif Shaher wrote:
>>>>
>>>>  Hello,
>>>>
>>>> We are thinking of using a 1.6GHz Intel Atom processor based PC with
>>>> multiple gigabit Ethernet ports
>>>> to collect data from multiple USPR2s and save that data off to disk.
>>>> We are hoping to be able to
>>>> use decimation rates as low as 4 for captures of shorts (16bit I and
>>>> 16 bit Q).  We will be doing
>>>> nothing else on this PC, just capturing data.  So it will host ubuntu
>>>> and gnuradio.  Does anyone have
>>>> any idea if there is a throughput limit that we might be up against,
>>>> say for 2 USRP2s, say 4 USRP2s.
>>>> Has anyone successfully run gnuradio on an Atom?
>>>>
>>>> Thanks,
>>>> Sharif
>>>>
>>>> _______________________________________________
>>>> Discuss-gnuradio mailing list
>>>> address@hidden
>>>> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>>>>
>>>>
>>> I run Gnu Radio on an Atom D510 system for narrow-bandwidth radiometry.
>>>
>>> No way in heck are you going to be able to run at 25Msps for even a
>>> *single* USRP2, let alone multiple ones.
>>>  I tried a 25Msps usrp2_fft.py on my atom D510 system (which is
>>> dual-core at 1.6GHz), and it couldn't keep
>>>  up.
>>>
>>>
>>>
>>> --
>>> Marcus Leech
>>> Principal Investigator
>>> Shirleys Bay Radio Astronomy Consortium
>>> http://www.sbrac.org
>>
>> I'm just going to parrot Marcus here. Nope, you are not going to be
>> able to handle that wide a bandwidth with an Atom.
>>
>> I think the most I ever did was take in about 6 FM channels,
>> channelize them, and FM demod each, and save each to a file. That's
>> 1.2 MHz of bandwidth there with some processing. My guess, you're
>> looking at 1.5 MHz of bandwidth with an upper limit on 2 MHz (and
>> that's if the gods favor you).
>>
>> You might try to find a dual-core Atom, which still won't give you
>> what you want, but it will be better.
>>
>> Tom
>>
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