I have recently been looking into benchmarking my device ( a custom x86_64 box ) and I have packaged the phoronix-test-suite for these purposes.
My custom packages repo on github
There are a couple performance pages on the OpenWrt wiki but there is no mention of what testing software was used.
Have there been other efforts to benchmark LEDE?
Many of the existing tests are not really practical for an embedded device (video game benchmarks, misc compiling tests, etc) however, I think there is a good framework in place for creating networking and telephony test suites.