[USRP-users] usrp2 over switch

Juha Vierinen jvierine at gmail.com
Thu Nov 25 04:20:52 EST 2010


Ethtool shows that the interfaces should be gigabit at least to the
computer (I don't know how to see this with the switch).

I tried 0.5 MHz, but the problem still persists with the switch. I
also tried launching the two USRP2 devices separately and together,
each time I had the same result. When I remove the switch, I don't
have the problem. I think I will just use multiple network interfaces
for now, but it would be nice (and more cost-effective) to be able to
reliably use a switch.

It could also be that I am not using the uhd interface correctly. The
switch model might also be the source of the problem. I'm looking into
these two possibilities now.


On Tue, Nov 23, 2010 at 17:39, Josh Blum <josh at ettus.com> wrote:
> Assuming there is now transmission (which you said (BTW this now works on
> the flow control branch)), the switch is transparent to the system. That is,
> USRP2 and UHD driver know nothing about it.
> Is it possible that one of the interfaces did not come up as gigabit speed
> (between your switch and pc)? I wonder if you are seeing the result of a
> bottle neck. Can you bring your receive rates down very low just to see that
> you can receive from both devices?
> Are you using both USRP2s independently (two single usrps instantiations or
> 1 multi usrp instantiation)?
> -Josh
> On 11/23/2010 01:47 AM, Juha Vierinen wrote:
>> Hi,
>> I have two usrp2 devices with the latest UHD firmware behind a Dell
>> powerconnect 2708 switch. The devices are found nicely, but I have
>> problems with streaming samples. Almost every other time I don't start
>> receiving samples. The problem disappears when I remove the switch,
>> then I always start receiving packets from the driver. I am always
>> only receiving samples, which should work ok even behind a switch.
>> Is this a problem of my switch?
>> Does anyone know of a switch type/brand that works nicely with USRP2+UHD?
>> juha
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