Re: [Discuss-gnuradio] VIA USB-2 combo card card, not working on linux for usrp

[ematlis]

I have an Adaptec DuoConnect AUA-1422 combo card with an NEC USB2 chipset. 
Using Mandriva 2007 spring on a Dell Latitude C840 with Pentium 4 m 2.6 
GHz cpu I only get 16 MB/s transfer as determined by benchmark_usb.py.  A 
little dissapointed, specially as I'm experiencing uO's with my latest 
4-channel receiver app.

eric

************************************
Eric H. Matlis, Ph.D.
Aerospace & Mechanical Engineering Dept.
120 Hessert Center for Aerospace Research
University of Notre Dame
Notre Dame, IN 46556-5684
Phone: (574) 631-6054
Fax:   (574) 631-8355

On Thu, 7 Jun 2007, Martin Dvh wrote:

> Hi all,
> I am using a combo pccard (USB-2 and firewire) with VIA chipset to get USB-2 on 
> my laptop.
>
> But using linux I can't get it to work.
> I get usrp overruns, (uOuOuO) even with decimation factors of 200 when using 
> usrp_rx_cfile.py
> This is only 320 ksamples/sec
>
> with top I see that the CPU is 80 % idle, so that is not the problem.
>
> When running benchmark_usb.py I get slightly better performance, 2 MB/sec works 
> and 4 MB/sec works sometimes, all above fail.
>
> I don't know why benchmark_usb works better then usrp_rx_cfile.
>
> When I run usrp_wfm_rcv_nogui.py I get garbled sound and uO and aU, but this is 
> logical. The script doesn't get enough data from the USRP.
>
> On windows usrp_rx_cfile.py just works fine with the same usb-2 card. (This is 
> a much older gnuradio/usrp release though)
>
> Does anybody have a clue, what is wrong here.
>
> I tried both kernel 2.6.18 and 2.6.20. I also tried noacpi acpi=off apm=off as 
> kernel-boot param.
>
> Or does anybody have a suggestion of an USB-2 addon card for a notebook 
> (pccard) that works with the USRP.
>
> Greetings,
> Martin
>
>
>
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