[USRP-users] Fwd: Removing DC offset on USRP B200

Marcus D. Leech mleech at ripnet.com
Mon Oct 30 15:01:43 EDT 2017


On 10/30/2017 02:54 PM, Oliver Wayne wrote:
> When I run perf top, I get libuhd.so.3.11 and libc-2.23.so 
> <http://libc-2.23.so> taking up about 15% and 21% respectively, rising 
> over time. This is at 10Msps. any thoughts? I've tried a few other 
> things like setting otw_format=sc12 and setting the frame size higher, 
> but I haven't had any success.
Could you try running your CPU in "performance" mode, rather than the 
power-saving 1.6GHz mode that it is apparently running at?


>
> On Tue, Oct 24, 2017 at 3:42 PM, <mleech at ripnet.com 
> <mailto:mleech at ripnet.com>> wrote:
>
>     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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>
>

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