Robert Engels wrote:
Using a 4mb file (so I could be "guarantee" the disk data would be in the OS cache as well), the test shows the following results.
Which OS? If it's Linux, what kernel version and distro? What hardware (disk type, controller etc).
It's important to know: I/O (and caching) is very different between Linux 2.4 and 2.6. The choice of I/O scheduler can also make a significant difference on 2.6, depending on the workload. The type of disk and its controller is also important -- and when you get really picky, the mobo model number.
I don't dispute your finding for a second, but it would be good to run the same test on other platforms to get comparative data: not least because you can get the kind of I/O time improvement you're seeing on some workloads on different versions of the Linux kernel.
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