[USRP-users] UHD 3.10.2 | X300 - High CPU load even for low samples rate

Brent Stapleton brent.stapleton at ettus.com
Thu Oct 19 13:57:26 EDT 2017

Hi Kai,

Fully consuming one core isn't unusual. Why do you think you're not

If you want to isolate the USRP performance, you could use UHD example
code, like benchmark_rate (in /path/to/prefix/lib/uhd/examples/). This will
provide a summary after running, and may give an indication of what
problems you're seeing.


On Thu, Oct 19, 2017 at 7:25 AM, Kai-Uwe Storek via USRP-users <
usrp-users at lists.ettus.com> wrote:

> Hey,
> after experiencing some problems (time outs, etc) with the current UHD
> develop version (master branch) I changed the UHD version to 3.10.2
> (maint branch, #122bfae).
> To do so, I just used the prefix recipe gnuradio-stable via pybombs.
> Now I'm not able to transmit even low bandwidth signals. My setup is
> - X300 via 1G ethernet
> - gnuradio (maint branch)
> - Debian with kernel 4.9.
> I used a simple flow graph with just a sine source directly connected
> to the USRP sink block. Even for sample rates below 2MSamples/s one of
> the cpu core of my Xeon E5-2630 v2 is 100% busy.
> Observing the cpu load with htop, I recognized that most of the cpu
> load is red which indicates kernel space activities...
> After several seconds I finally got many "U"s in the console window.
> Some ideas how to isolate the problem?
> Thanks in advance!
> Kai
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> USRP-users at lists.ettus.com
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