Tracking subdomain with Google Analytics - google-analytics

Question

I have been tracking both the main site and the subdomain using the main site's code, however, when I go to Site Content > Pages, it links to the main domain when it's supposed to link to the subdomain for viewed pages that are supposed to refer to the subdomain.
This is the code I have:
Main site:
var _gaq = _gaq || [];
_gaq.push(['_setAccount', 'xxxx']);
_gaq.push(['_setDomainName', 'sitename.com']);
_gaq.push(['_trackPageview']);
(function() {
var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
})();
Subdomain:
var _gaq = _gaq || [];
_gaq.push(['_setAccount', 'xxxx']);
_gaq.push(['_setDomainName', 'sub.sitename.com']);
_gaq.push(['_trackPageview']);
(function() {
var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
})();
I have read Google Analytics' documentation on the subdomain. For _setDomainName I have tried both .sitename.com and sitename.com, but it still shows the same results. So, the page content in the Google Analytics dashboard links to the main site, but it won't link to the subdomain when referring to subdomain pages.
This poses a problem for index pages because how will I know the division of unique views between the domain and subdomain? I must be doing something wrong here!

Answer 1

Have you considered setting up separate profiles for your subdomains? Example:
profile 1: rollup that has no filters, takes everything, so that you can see data from everywhere
profile 2: only traffic for www.sitename.com. Create a filter to include only www.sitename.com traffic.
profile 3: only traffic for sub.sitename.com. Create a filter to include only sub.sitename.com traffic.