We ran into a similar issue. Big things that helped us was to move high rate dsp calculations to RFNoC.
I've also had luck with volk_profile. It seems to help with some workloads. On Wed, Sep 6, 2017 at 16:53 Philip Balister via USRP-users < [email protected]> wrote: > On 09/06/2017 04:38 PM, Marcus Müller via USRP-users wrote: > > Hi Mr Hamilton, > > > > So, what you'd want to optimize first depends on what needs the most > > optimization. Your x86 program might be a good place to start looking > > into what the bottleneck is. If you're running Linux on your x86, I can > > heartily recommend `perf`, which is a tool that lets you display live, > > record and analyze the points in your code where the program spends most > > time. > > "perf top" gives results pretty quickly. > > It also sounds like you aren't using both cpu's to the full extent. > Maybe there is just one block doing all the work? > > Also, looking at using rfnoc to do high rate functions to reduce > calculations that need doing on the arm is a good plan. > > Philip > > > > > In general, modern x86 have way larger memory bandwidth and larger CPU > > caches, so that alone can become critical, but also things like more > > capable SIMD instructions and less hardware-handling overhead. > > > > I don't know whether this helped you much, but I hope it's a start, > > best regards, > > > > Marcus Müller > > > > On 09/06/2017 10:06 PM, S Hamilton via USRP-users wrote: > >> We're moving an application that we had running on pc hardware with > >> the Ettus B210, to the embedded arm E310. On the pc side we were at > >> 80% idle cpu when running (intel i5-4570). With armv7 we're down to > >> 30% idle, with one of the cores @100% so it's not keeping up. > >> Are there any arm specific optimizations that are recommended or > gotchas. > >> We are using the release4 version of the SDK and firmware. > >> > >> We'd also like to use the complex_to_mag_approx RFNOC block. Is there > >> any sample code around to look at. > >> > >> Thanks, > >> > >> > >> _______________________________________________ > >> USRP-users mailing list > >> [email protected] > >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > > > > > > > > > > _______________________________________________ > > USRP-users mailing list > > [email protected] > > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > > > > _______________________________________________ > USRP-users mailing list > [email protected] > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > -- Maj Tom Bereknyei Defense Digital Service [email protected] (571) 225-1630
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