Randy,
You are definitly exceeding what the kernel will cache and writing to disk on
some tests. I guess it depends on what is more important to you. I think
both are valid things to test, and you may want to try not limiting memory to
get just FS performace in memory for large files. However, writing to disk
is important, especially for things like bounce-buffer. Did you have himem
support in your kernel? If so, did you have a bounce-buffer elimination
patch as well?
Does the storage system/controller have a disk cache? What size?
Also, does IOzone default to num procs=num cpus? I didn't see any options in
your cmdline for num_procs.
-Andrew
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