You have a myriad of choices to make when installing and configuring Squid, especially when it comes to the way Squid stores files on disk. Back in Chapter 8, I talked about the various filesystems and storage schemes. Here, I'll provide some hard data on their relative performance.
These tests were done with Web Polygraph, a freely available, high-performance tool for benchmarking HTTP intermediaries (http://www.web-polygraph.org/). Over the course of many months, I ran approximately 40 different tests on 5 different operating systems.