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

Oliver Wayne olivergwayne at gmail.com
Mon Oct 30 15:28:38 EDT 2017


Hi Marcus,

I switched to performance mode and got the same results. I'm running LDXE
on this computer, so I changed it by editing /etc/init.d/cpufrequtils and
setting GOVERNOR="performance", then using sysv-rc-conf to deactivate
on-demand.

On Mon, Oct 30, 2017 at 3:01 PM, Marcus D. Leech <mleech at ripnet.com> wrote:

> 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 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> 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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