You could perhaps do a "perf top" and see what's consuming time.
The Gnu Radio signal source blocks are not screamingly efficient, so it
may be that they just aren't keeping up, although at 4Msps, you wouldn't
expect them to be too stressed.
On 2017-10-24 15:12, Oliver Wayne via USRP-users wrote:
> Apologies for not forwarding to the full list. I'm attempting to run the
> attached flowgraph with the following hardware, but getting underflows.
>
> I have 8 GB of RAM, so don't think that's a problem. Running lspci | grep -i
> usb, I get the following output
>
> 00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family
> USB Enhanced Host Controller #2 (rev 04)
> 00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family
> USB Enhanced Host Controller #1 (rev 04)
>
> I've attached a copy of cpuinfo.
>
> Thanks!
>
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