Testing with remote gdbserver

Hello,

are there any known-to-work board configuration files to test gdbserver remotely?
After reading https://sourceware.org/gdb/wiki/TestingGDB, I supposed that this
has to be relatively simple, at least between two GNU/Linux x86 machines with public
key-based ssh access between them. But, since I just have a) noise about missing 'runtest'
(which is /usr/bin/runtest in my $PATH), b) a lot of FAILED messages (probably due to
communication timeouts) and c) time-to-time zombie ssh processes, I assume that my setup
is grossly misconfigured at some non-obvious but very important point. I've started
from example remote board file taken from "Testing gdbserver in a remote cross-target
configuration" of the above and tried some tweaks, but still have no PASSes (except
for local libiberty tests). Is it possible to run the tests in a "much more verbose"
mode to check what's going on?

Thanks in advance,
Dmitry