[USRP-users] Still problems with the b210...

Neel Pandeya neel.pandeya at ettus.com
Wed Oct 29 11:28:41 EDT 2014

Hello Ralph:

Are you running with UHD 3.8.0? There were changes made recently that
should address these issues. Please let us know which UHD release you're

Is your B210 being powered from the AC wall power brick, or from the USB

Which USB controller do you have? What is the output of "lspci"?


On Wed, Oct 29, 2014 at 12:01 AM, Ralph A. Schmid, dk5ras via USRP-users <
usrp-users at lists.ettus.com> wrote:

> Hi,
> despite all the new uhd releases, I still have the issue with the bigger
> sampling rates. Other projects became a bit more calm now, so I want to
> throw some of my time onto the problem.
> To recall the story, my b210 (ur uhd) freezes USB on my virtual machine
> when
> sampling rates exceed 8 MS/s. At 32 MS/s it is a matter of seconds to very
> few minutes until the system hangs. This seems to be not the issue with
> disconnecting USB any more, this problem is gone, but I have no idea if
> they
> somehow are related.
> My test scenario is uhd_fft or gqrx. Everything is always on latest
> release,
> built from source, no precompiled binaries. The OS is Kubuntu 14.04, I can
> reproduce the same behavior with Kubuntu 12.04 or 14.10, no matter if using
> existing VMs or freshly installed systems.
> When the freeze happens, USB connectivity seems totally gone, commands like
> lsusb just hang and do not come back, and even a system shutdown does not
> complete, I have to switch of the VM the hard way.
> Now one could think this is a machine issue - but for sure it has to do
> with
> uhd somehow, as Nuands BladeRF runs with 30 MS/s for hours, using the same
> Cypress FX3 USB controller. The tool chain for the BladeRF is similar,
> gqrx,
> gnuradio, gr-osmosdr, the only difference is uhd. All within the same VM.
> On the same machine within the Windows host system the b210 runs for hours
> at 32 MS/s. So the hardware looks OK, also do USB controllers and USB
> cables. Adding an USB3 hub with external power changes nothing, neither
> does
> using the supplied 6V power supply for the b210.
> This complete USB stall looks to me like some issue on a deeper layer, in
> the interaction with the OS.
> Now is my knowledge of all this Linux stuff very limited, and to collect
> more debug information I need one who can take me by the hand and point me
> to the right direction, where to look, what to collect. I am not very
> familiar with log file parsing and reading, especially the powerful looking
> commandline tols for this are new to me.
> Thank you very much for any input - I really would love full functionality
> of my 1k$ toy :)
> With best regards
> Ralph.
> --
> Ralph A. Schmid
> Mondstr. 10
> 90762 Fürth
> +49-171-3631223
> ralph at schmid.xxx
> http://www.bclog.de/
> _______________________________________________
> USRP-users mailing list
> USRP-users at lists.ettus.com
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
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