Ruby 1.9 bug with Linux + large static files on 32-bit

[Eric Wong]

Hi all,

Since Rainbows! 0.92.0, static file serving performance was improved
under Linux (and possibly Solaris) under 1.9 by using IO.copy_stream.

Unfortunately, I've noticed large files (>4G) can get truncated.
(2-4G files just end up falling back to a read+write loop in C).

There's a trivial patch for the issue here:

  http://redmine.ruby-lang.org/issues/show/3484

-- 
Eric Wong