> Seems like an overoptimization to me, unless we plan on using readfile to 
> bring in some really huge files.  Also, there's no harm in doing this in 
> non-x86 ISAs.  I won't fight putting those changes in, I'm just questioning 
> their necessity.

Well, we don't know how it impacts performance.  The concern is that
it just slows down simulations unnecessarily.  I don't know what it
has to do with the size of files.  It's sizeof(buf) which is
statically allocated, so we pay the same amount every time.  I won't
fight either.

  Nate
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