That's not precisely a fair test. How about this? 
#!/usr/bin/perl

use Benchmark 'cmpthese';

package Foo;

sub new
{
        my $class = shift;
        bless({@_}, $class);
}

sub foo
{
        my ($self, @stuff) = @_;

        return map { $_.$_ } @stuff;
}

sub foo_pipe
{
        my $self = shift;
        $self->foo(@_);
}

sub foo_my
{
        my ($self,@stuff) = @_;
        $self->foo(@stuff);
}

sub foo_goto
{
        goto &foo;
}

package main;

my $foo = Foo->new();
my @stuff = 0..100;
my @foo;

cmpthese(500, {
        pipe => sub { $foo->foo_pipe(@foo=@stuff) },
        goto => sub { $foo->foo_goto(@foo=@stuff) },
        my   => sub { $foo->foo_my(@foo=@stuff) },
});

[download]
This actually uses the entire array. The difference is rather minor, easily buried by the subroutine overhead. 
Benchmark: timing 5000 iterations of goto, my, pipe...
      goto:  3 wallclock secs ( 2.96 usr +  0.00 sys =  2.96 CPU) @ 16
+89.19/s (n=5000)
        my:  4 wallclock secs ( 3.18 usr +  0.01 sys =  3.19 CPU) @ 15
+67.40/s (n=5000)
      pipe:  3 wallclock secs ( 2.89 usr +  0.00 sys =  2.89 CPU) @ 17
+30.10/s (n=5000)
       Rate   my goto pipe
my   1567/s   --  -7%  -9%
goto 1689/s   8%   --  -2%
pipe 1730/s  10%   2%   --

[download]

In reply to Re^10: How About A Better Benchmark? by tadman
in thread stoping and restarting a loop by mnlight

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.