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?
On Mon, Oct 30, 2017 at 3:28 PM, Oliver Wayne <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> > 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, <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 >>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >>> >>> >> >> >
_______________________________________________ USRP-users mailing list USRP-users@lists.ettus.com http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
