Disk Read ahead

I wonder if a web server running apache and use mysql should have a higher read ahead threshold or a lower one? (256 vs 4kb)

Read-Ahead Threshold

Read-Ahead Threshold is the amount of additional bytes that will be read when a application reads data in sequence. It is meant to improve read performance by anticipating the next read. This works in many cases, unfortunately the performance will decrease if more than one application accesses the hard drive at the same time.
Disk Read ahead

Shall i run ab to test it out? Any suggestion on the subject Disk Read ahead

 

 

 

 

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