bin/22442: [PATCH] Increase speed of split(1)

[David Schultz]

Hmm...I'm not seeing any measurable difference in -CURRENT in
either the cached or the uncached case. The sequential read-ahead
heuristic in the kernel seems to negate any benefit of using a
larger buffer size, and using a larger buffer just causes problems
when people try to split out larger files (e.g., multi-GB files
for transfer to removable media). Interesting idea, though...