How do I determine my level 1 cache?

How do I determine the cache size and where do I find it in the registry to change it if it’s actual value isn’t reflected there?

This question arose from this post. We’ve been around the world and back on level 2 cache, now I’m curious about level 1.

http://articles.techrepublic.com.com/5100-22_11-5109814.html