Enable some performance tuning

Enable some performance tuning

These parameters increase the throughput on various (large-ish)
systems by 5-10% on the slight expense of higher power consumption.

Socket buffers are increases and the system is configured to be
less aggressive when scheduling processes from one processor to
another one which ensures that the cache remains "hot" for longer.

On a slower system (apu1d) no performance improvement or loss
could have been measured.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>