I think the issue in question is that even running over a file, finding newlines, and forming lines, in the same way that readline should do, works faster in linux as a read of a block of data and subsequent line formation than as a readline.
An initial answer to this has already been made by tye in the note here.

I believe the question is asking more why Perl IO is broken on Linux, and what can be done to work around this in the meantime.
Cheers,

Malk

In reply to Re: Re: perl io and linux issues by Malkavian
in thread perl io and linux issues by dino

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