RPI3 swap experiments

[bob prohaska]

It appears that some progress has been made in getting swap working reasonably
on the RPI3. A -j4 buildworld attempt running r336356 to compile 336431 failed
with "out of swap" but the worst read and write delays were less than 5 seconds,
a marked improvement over previous examples.

In this case swap was split, 2 each 1GB  partitions on USB flash plus 1 GB on the 
microSD card. Previous attempts using 3 each 1 GB partitions on USB flash have been
repeatedly successful, while a single attempt using 3 each 1GB partitions on microSD
failed.

Details are at
http://www.zefox.net/~fbsd/rpi3/swaptests/r336356/2gbusbflash_1gbsdflash/

Thanks for reading,

bob prohaska