If you want the 9th to show up in your output, you need to print it: 
foreach my $key ( keys %ifSpeeds )
{

    if ($counter <= 8) {
        print "$key ";
        $counter++;
    } else { 
        print "$key\n";   #  <--------------
        $counter = 1;
    }
}

[download]
Update: List::MoreUtils can also be used for this: 
use List::MoreUtils qw(natatime);
my $it = natatime(9, (keys %ifSpeeds));
while (my @vals = $it->()) {
    print "@vals\n";
}

[download]

In reply to Re: Looping Over Hash Skips an Element? by toolic
in thread Looping Over Hash Skips an Element? by mmartin

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