Re: [Discuss-gnuradio] Intel Atom Processor

Hi David,

Thank you so much, very helpful.

On 10/9/2010 7:48 AM, David Evans wrote:
>
> This may also be helpful.
>
> -Zotac ION Dual Core 1.6GHz Atom N330 Mini-ITX Board
> -2x USRP2 Rev 3, 10MHz bandwidth each
> -Netgear GigE Switch, the MB has only one port
> -Seagate 1TB baracuda (5900 rpm I think)
> -ext2 filesystem, Ubuntu 9.04
>
> Using VRT branch code to just dump raw 16bit I&Q I was able to dump 15 minute
> cuts without problems (i didn't test for longer).
> I found though once the disk got to 30% capacity, dropouts occur, probably due
> to the write speed slowing down as the head nears the centre of the disk.
> Splitting the data from each USRP2 to seperate disks solved this problem.
> I was also able to test a few different boards, and concluded that the disk
> chipset/driver was a notable bottleneck between boards. eg, a Dell i7 based PC
> could not achieve this! I also used "bonnie++" to test disk throughput, the
> results of which tallied with the streaming results.
>
> From what I remember, if the bonnie++ write result was around 100MB/s, then you
> could sustain the 80MB/s (Going by disk test results on the web, this seemed in
> line with most max rates for sata drives).
> Also, I believe I also got 12.5MHz BW per channel (I'll check if I get a
> chance), but then, this is two channels, not one full 25MHz capture.
>
> Dave.
>
>
> ----- Original Message ----
> From: Sharif Shaher<sshaher@steelriver.com>
> To: Marcus D. Leech<mleech@ripnet.com>
> Cc: discuss-gnuradio@gnu.org
> Sent: Sat, 9 October, 2010 2:47:53
> Subject: Re: [Discuss-gnuradio] Intel Atom Processor
>
> Hi Marcus,
>
> Thank you so much for doing this and for informing all of us of your
> results.
> Helpful to us, and probably to others.
>
> On 10/8/2010 6:21 PM, Marcus D. Leech wrote:
>> On 10/08/2010 04:44 PM, Sharif Shaher wrote:
>>> Hi Marcus,
>>>
>>> That would be great, and greatly appreciated, we are just not sure
>>> is if there is a fighting chance or not...thus the question to the forum.
>>>
>>> Thanks so much,
>>> Sharif
>> On my dual-core Atom D-510 at 1.67GHz, with 4GB of memory, and an Intel
>> 80GB SSD, I can run at 12.5Msps without a problem.
>> Once I step it up to 16.67Msps, it starts getting long sequences of
>> overruns "O".
>>
>> This is with the UHD "Single USRP" source, using complex-short output,
>> into a "file sink" with a short input, vector-length 2. From
>> a USRP2.
>>
>>
>>
>>
>>
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