I'm not sure that a memory hogging recursive function makes for a fair benchmark of function calling speed (even if the tail recursion could be optimized away in another language -- and if the tail recursion could be optimized away, you wouldn't be calling the function anymore, you'd just be doing a goto). I think this version of func_test.pl is more fair (which attempts to test the speed of function calling rather than memory allocation):
#sum of number between 1 and 1,000,000
$n = 1_000_000;
my $t = 0;
$t = addup( $t, $n-- ) while $n;
$_ + $_;
and then the two come out closer:
$ time ./func_tst.pl
$ time ./loop_test.pl
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