On 10/31/2017 01:15 PM, Oliver Wayne wrote:
Another thought I had -- because I don't anticipate my waveform changing much, is there a way to pre-record my waveform and transmit it continuously, which if I understand the problem correctly would avoid the underruns?
Sure, just record it in a file-sink, and then play it back from a file-source.
On Mon, Oct 30, 2017 at 3:28 PM, Oliver Wayne <olivergwa...@gmail.com <mailto:olivergwa...@gmail.com>> wrote: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 <mle...@ripnet.com <mailto:mle...@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 <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, <mle...@ripnet.com <mailto:mle...@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! _______________________________________________ USRP-users mailing list USRP-users@lists.ettus.com <mailto:USRP-users@lists.ettus.com> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com <http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com>
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