examples: Change benchmark_rate default thread priority

This commit modifies the benchmark_rate example to use the operating
system's default thread priority, instead of real-time thread priority,
by default. UHD 4.0 includes a number of significant improvements to
the streaming architecture that allow for best performance to be
achieved without having to resort to elevating the process thread
priority to real-time. Internal testing shows degraded streaming
performance in common use cases (i.e. non-DPDK) when the process thread
priority is set to real-time.

It should be noted that applications which use DPDK may still experience
better performance when the process thread priority is set to real-time.
Users may continue to manually override the process thread priority
in benchmark_rate using the --priority=high command-line option. The
need to elevate the process thread priority will be application- and
deployment-dependent.

0 files changed, 0 insertions, 0 deletions