If you want more from Brendan Gregg on analyzing performance, be sure to check out his book, Systems Performance: <a href="http:&#x2F;&#x2F;smile.amazon.com&#x2F;dp&#x2F;0133390098" rel="nofollow">http:&#x2F;&#x2F;smile.amazon.com&#x2F;dp&#x2F;0133390098</a>